ISOGEOCHEM List

Re: Question about balances

Steve Nelson — Fri, 6 Mar 2026 15:50:55 -0700

Thanks Jon. Just the sort of issues I have in mind. There’s got to be a
reason why some of these balances are twice the price.

Re: Question about balances

Jon Cocca — Fri, 6 Mar 2026 19:29:26 +0000

Hi Steve,

I have limited use of a semi-micro Radweg laboratory balance and have found stability and reproducibility to be an issue. Having to choose between Radweg, Mettler, Ohaus or even Sartorius one would need to assess who in your lab is using the balance, patience to allow it to stabilize between measurements and accuracy. With budgets being tight, it might be a tough choice. [...]

Question about balances

Steve Nelson — Fri, 6 Mar 2026 10:22:13 -0700

HI Colleagues,

We obviously all use analytical balances, so there's a lot of expertise
residing with list members. I'm in the market for a semi-micro balance
(±0.01 mg). Mettler and Ohaus have such balances for as low as about $5K
that will meet my needs.

However, Radweg advertises semi-micro balances for as low as about $2.5K. [...]

Advertisement for LIME Metal Isotope Laboratory chemist position at PSU

Fantle, Matthew S — Fri, 6 Mar 2026 16:56:58 +0000

Dear colleagues:

The Laboratory for Isotopes and Metals in the Environment (LIME) is searching for an isotope chemist. Please forwrd to anyone that you think might be interested:

LINK TO AD: https://psu.wd1.myworkdayjobs.com/PSU_Academic/job/Penn-State-University-Park/Isotope-Research-Chemist_REQ_0000075963-2

Isotope Research Chemist
The Laboratory for Isotopes and Metals in the Environment (LIME), part of the Earth and Environmental Systems Institute of the College of Earth and Mineral Sciences at The Pennsylvania State University (University Park campus) seeks an Isotope Research Chemist. LIME is a shared user facility that serves researchers from a range of disciplines at Penn State and other academic institutions, as well as in industry [...]

Re: Thermo Delta-V Dual Inlet bellows

gerard olack — Wed, 4 Mar 2026 12:59:43 -0600

HI Wei--

We used the Bourns 3540S-1-104L. 100 kohm for the potentiometer (it has
a metal cap over the plastic housing on the shaft side)--it was used on
older 253 models. It's sturdier than the one Thermo is (was?) shipping
with Delta's now. I haven't checked in a while for the latest part
numbers--just get a replacement that's meant to be belt driven and not
use one made for use with a knob. [...]

Is anyone familiar with operating an Elementar Vario Max CNS?

Morrison Nolan — Wed, 4 Mar 2026 17:30:39 +0000

I'm working at getting an Elementar Vario Max CNS that has been dormant for months up and running again. I'm running into some issuers and would like to chat with an experienced user if I can.

Thank you

M. Nolan

mrnmst@msn.com<mailto:mrnmst@msn.com>

Re: Thermo Delta-V Dual Inlet bellows

Ying Lin — Wed, 4 Mar 2026 08:10:16 -0800

Dear Wei,

I had the reference bellow leaky, since Kiel analysis only utilize one
bellow and so I swapped bellows thru software parameter adjustments and
cable exchanges.

Ying Lin

On Wed, Mar 4, 2026 at 4:17 AM Wei Huang <wei.huang1009@gmail.com> wrote:

> Thank everyone for your input!
>
> I replaced the potentiometer, but didn't solve the problem. I could turn
> the brass wheels very easily, which used to be very hard. But the guiding
> screw didn't move at all. I checked the guided pin, and it is still there.
> So I am guessing something else is wrong.
[...]

Re: Thermo Delta-V Dual Inlet bellows

Wei Huang — Tue, 3 Mar 2026 23:55:44 -0500

Thank everyone for your input!

I replaced the potentiometer, but didn't solve the problem. I could turn
the brass wheels very easily, which used to be very hard. But the guiding
screw didn't move at all. I checked the guided pin, and it is still there.
So I am guessing something else is wrong.
I am thinking of swapping the reference bellows with the sample bellows.
Has anyone done that before? Should I swap the whole bellows or just some
parts of the bellows? Do I need to break the vacuum beforehand? Can anyone
share the detailed instructions to disassemble/reassemble [...]

Re: Pyrocube problem on pyrolisis mode

CHRISTIAN DIETZ — Wed, 4 Mar 2026 10:52:44 +1100

Hi Carlotta,
if you pack samples very flat, the may get stuck between the two plates of
the autosampler or, may be, inside the ball valve.
It won't really get into ball and half shells causing scratching.
Samples leaking dust or salt from the Sn/Ag cups may contribute to
scratching the half shells, so does time.
If you find them visibly scratched, you better change them.
Also make sure you adjust the wheel flange of the valve to the right
pressure, too high will wear it out, too low may cause leaking.
Cheers
Chris [...]

Re: Pyrocube problem on pyrolisis mode

Simon R Poulson — Tue, 3 Mar 2026 18:40:42 +0000

Carlotta,

Have you tried running your pyrolysis OH analyses using tin capsules, instead of silver capsules? It sounds like you’ve had no problems with using tin capsules in combustion mode. If you’re not running samples that are particularly small, the slightly larger blank from the tin capsules vs. silver capsules might not be a problem for your analyses? [...]

R: [ISOGEOCHEM] Pyrocube problem on pyrolisis mode

CARLOTTA VOLTERRANI — Tue, 3 Mar 2026 15:15:57 +0000

Dear Francois and Bill,

Thank you for your very clear and prompt feedback.
We have been operating this instrument in CNS mode for two years, using spherical or cubic tin capsules, and we have never had this kind of problem. Since switching to pyrolysis (OH) mode, we haven't been able to work smoothly. We suspected that the issue was precisely the shape of the capsules. In light of this, as soon as we manage to replace the green hemispheres of the ball valve, we will try working with this approach again.
Regarding the maintenance of the ball valve, I understand [...]

Re: Pyrocube problem on pyrolisis mode

Bill Lukens — Tue, 3 Mar 2026 09:07:52 -0500

Hi Carlotta,

We run our Pyrocube in combustion mode, but to my knowledge nothing is different about the ball valve setup compared to pyrolysis mode. I learned the hard way that properly aligning the green half shells is trickier than you might first suspect. The first time that I replaced ours, it took a couple attempts to properly align them while reassembling. I subsequently had issues with leaks and unstable EA analyses, so when we had some Elementar engineers on-site for maintenance, they found that I had scratched the half shells in my attempt to reassemble the ball valve. I [...]

Re: Pyrocube problem on pyrolisis mode

FOUREL FRANCOIS — Tue, 3 Mar 2026 09:23:06 +0000

Hello Carlotta,
I have been using a pyrocube in pyrolysis mode since 2010 and, after using different types of Elemental Analysers I find the ball valve system very reliable and very efficient to eliminate the nitrogen blanks…providing the capsules are properly folded.
Making the capsules as flat as possible does not seem like a good idea, regardless of the type of solid auto sampler you are dealing with. To avoid any risk of having your capsule being trapped in your auto sampler it needs to be 3D, not flat. Make it a cube or a sphere but definitely not flat.
[...]

Hiring: Operational Director NU Stable Isotope Biogeochemistry Laboratory

Magdalena Rose Osburn — Mon, 2 Mar 2026 21:00:36 +0000

Dear Isotope Geochemists,

We are hiring!

Please see the job description below and forward to anyone you think might be interested. Please reach out with questions.

Cheers,

Maggie Osburn

International clumped isotope workshop - Utrecht - 23rd to 23th of June 2026

ICIW Utrecht 2026 — Mon, 2 Mar 2026 13:59:04 +0000

Dear all,

The registration for the 10th International clumped isotope workshop held from the 23rd to 26th of June 2026 in Utrecht, The Netherlands, is open. We look forward to your abstract submissions!

On the website you can also register for the IsoSchool which will be held on the 21st to 23rd of June. [...]

Pyrocube problem on pyrolisis mode

CARLOTTA VOLTERRANI — Mon, 2 Mar 2026 13:47:36 +0000

Dear ISOGEOCHEM community,
I am writing to ask for your advice. In our stable isotope laboratory, we have an EA-IRMS setup using Elementar instruments (precisION + Pyrocube as EA). We are currently using the Pyrocube in pyrolysis (OH) mode.
We are experiencing some issues with the two green half-shells located inside the ball valve. During maintenance, we found them scratched, which is causing significant leaks in the instrument. We suspect the cause might be the sample encapsulation. It was suggested that we flatten the capsules (silver ones, of course), but we are concerned that this very thin shape might somehow [...]

2nd XI'AN CARBON INTERNATIONAL MEETING September 17-20, 2026

Mon, 2 Mar 2026 16:18:43 +0800

Dear All,
You are warmly welcome to Xi'an to attend and present your results at the second Xi’an Carbon Meeting, an International Meeting on Carbon Pollution, Sequestration and Conversion to Energy and Chemicals.
Participants from about 50 countries enjoy 30-days visa-free stay in China. There are many direct flights from major world cities to the Xi'an XIY international airport. Non-Chinese citizens will benefit from a special assistance during the meeting.
Xi'an, an ancient Chinese capital, is a famous historical city located at the start of the Silk Road inside the magnificient Qinling mountains. Xi'an is known for the Terra Cotta [...]

Re: stability issues after source cleaning

Hill, Brett (AAFC/AAC) — Fri, 27 Feb 2026 20:58:01 +0000

Unclassified / Non classifié

Hello fellow Isogeochemians, (my chemistry knowledge is too weak to be called an Isogeochemist),

In case any of you are interested in the outcome of my wrestle with stability, the answer seems to have been patience (which I find elusive).

I dropped both the extraction and electron energy to much lower values than I have had them in the past, and I retuned the instrument. The results of my on-offs were so close to acceptable that I couldn’t bring myself to pull the source out again. In the end I am glad I didn’t. Instead, I [...]

Re: Keeping GC Inlet Clean?

Travis Meador — Fri, 27 Feb 2026 14:19:47 +0000

Dear Jason,
Have you seen any changes in the flows at the measuring points, and if the response corresponds to changes in flow set on the GC? We've had to replace filters in the injector for the carrier gas and split flows after dirty injections.
Best regards,
Travis

-----Original Message-----
From: Stable Isotope Geochemistry <ISOGEOCHEM@list.uvm.edu> On Behalf Of Jason Visser
Sent: Tuesday, February 24, 2026 10:28 PM
To: ISOGEOCHEM@LIST.UVM.EDU
Subject: [ISOGEOCHEM] Keeping GC Inlet Clean? [...]

14th International Conference on the Applications of Stable Isotope Techniques to Ecological Studies (ISOECOL) - HONG KONG!

David Baker — Thu, 26 Feb 2026 12:34:19 +0800

Dear Friends,

On behalf of the organising committee - I am delighted to announce that the ISOECOL2026 website is now live and accepting abstracts and workshop proposals.

https://www.isoecol.com/2026/

Please share with your networks! We look forward to welcoming you to Hong Kong!

Sincerely,

Dave

David M. Baker, Ph.D.
Interim Director, The Swire Institute of Marine Science
www.swims.hku.hk/ <https://www.swims.hku.hk/>
dmbaker@hku.hk <mailto:dmbaker@hku.hk>
The Swire Institute of Marine Science The University of Hong Kong Cape d'Aguilar Road, Shek O, Hong Kong <https://maps.google.com/?q=The%20Swire%20Institute%20of%20Marine%20Science%20The%20University%20of%20Hong%20Kong%20Cape%20d%27Aguilar%20Road,%20Shek%20O,%20Hong%20Kong>
<http://www.twitter.com/SWIMSHKU>
<http://www.facebook.com/hkuswims>
<https://static.wixstatic.com/media/11062b_55e4be1e75564866b6c28290f9a9d271~mv2.png/v1/fill/w_30,h_30,al_c,q_85,usm_0.66_1.00_0.01,enc_auto/11062b_55e4be1e75564866b6c28290f9a9d271~mv2.png>
<https://www.youtube.com/@swimshku832>
<https://www.swims.hku.hk/>
IMPORTANT: The contents of this email and any attachments are confidential. They are [...]

Re: TCEA Transformer

Jeff Cullen — Wed, 25 Feb 2026 23:21:11 -0500

Hi Robert,

Yes I could see that could certainly be true that the Jumo temperature controller is able to compensate for a less than ideally rated output voltage as the SiC increases its resistance through time. Ive never tried to "track" the heating on off cycling occurring during steady state constant Temp operation (both the duration burst time and frequency of bursts of electrical power delivery to the heating element) to see if it changes as the heating element ages up to the point that the controller is calling on power delivery 100% of the time just to try to [...]

Job Opening -- East Cost United States-- IRMS Field Service Engineer with Thermo Fisher Scientific

Colin Carney — Wed, 25 Feb 2026 16:46:36 -0800

Thermo is hiring a field service engineer to work with the United States
IRMS team. This role offers the opportunity to provide expert support to
scientists and technicians in labs across the country. The learning curve
for this role is very steep and the travel requirements are demanding, so
it will take the right kind of person to thrive in this position. But for
the right individual this can be a very rewarding career. [...]

Goldschmidt session 07g: From Early Earth to Other Worlds: Geochemical Perspectives on the Causes and Consequences of Planetary Habitability

Chenyi Tu, Ph.D. — Wed, 25 Feb 2026 22:42:03 +0000

Dear all,

The deadline for abstract submission to the Goldschmidt Conference 2026 is fast approaching (tomorrow!). We warmly invite you to submit your abstracts to the following session:

07g From Early Earth to Other Worlds: Geochemical Perspectives on the Causes and Consequences of Planetary Habitability (https://conf.goldschmidt.info/goldschmidt/2026/07/sessions/index.cgi?username=8973&password=129789)

Session Description:

The Earth's 4.5-billion-year history provides the most complete record for understanding how life and environment have co-evolved to sustain planetary habitability. This session invites contributions that harness Earth’s geologic and geochemical archives to explore the feedbacks among the biosphere, atmosphere, hydrosphere, and solid Earth that have regulated environmental stability through time. We [...]

Re: Keeping GC Inlet Clean?

Seth Newsome — Wed, 25 Feb 2026 22:39:05 +0000

Hi Jason…

When is the last time you changed your Silflow manifold? Assuming you use one post-column and pre-IsoLink…

Seth

Seth D. Newsome
Professor, Biology Department
Associate Director, CSI
University of New Mexico
Albuquerque, NM 87131
831-566-3276
newsome@unm.edu
sethnewsome.org

On Feb 25, 2026, at 1:26 PM, Jack Hutchings <jahutch2@gmail.com> wrote:

[EXTERNAL]
Hi Jason,

Happy to be wrong, I suppose! Based on what you've said (trimmed column, replaced liner, leak-free), I would start thinking about: backflush heater is malfunctioning, potential leak within HTC ceramic, or perhaps the GC column has started to fail. If you wanted, we could try a Zoom [...]

Qtegra "Timeout waiting for Injection Started"

Alessandro Mauceri — Wed, 25 Feb 2026 21:51:33 +0000

Hello all,
We recently replaced our 30 m Thermo TG-5 column with a 60 m Agilent DB-35 column in our Trace 1610 GC. Our current configuration is:

Trace 1610 GC → GC Isolink II → Conflo IV → Delta Q IRMS, operated via Qtegra.

After updating the column configuration on the GC touchscreen and modifying the corresponding ChromControl methods in Qtegra, we attempted several transfer tests, oven cycles, and blank/standard runs. The sequence will initiate, and the log displays “-Before Scan-” for some time, but the run ultimately fails without injecting, with the error message: “Timeout waiting for Injection Started.” [...]

Re: TCEA Transformer

Robert Van Hale — Wed, 25 Feb 2026 21:03:03 +0000

Dear Jeff,
I too wondered about the real need to use a multitap transformer. Certainly the literature on silicon carbide elements has it that their resistance may change 10-fold over their lifetime but in my experience the need to change the voltage supplied to the element has arisen infrequently - in the lifetime of the elements.
I also wonder if power delivered to the element is already sufficiently controlled by the PID - thermocouple control loop and that should allow for any old voltage to be used perhaps (within reasonable range)?
Nevertheless, I got an equivalent unit to the OEM [...]

TCEA Transformer

Jeff Cullen — Wed, 25 Feb 2026 14:40:02 -0500

Hey All, question for the TCEA folks out there.

The transformer that drives the heating element on our TCEA shorted out and am trying to source a replacement.

Thermo discontinued the TCEA awhile ago and does not carry replacements. They checked globally, it appears there is not a single one anywhere in the world. [...]

Re: Keeping GC Inlet Clean?

Jack Hutchings — Wed, 25 Feb 2026 13:23:54 -0600

Hi Jason,

Happy to be wrong, I suppose! Based on what you've said (trimmed column,
replaced liner, leak-free), I would start thinking about: backflush heater
is malfunctioning, potential leak within HTC ceramic, or perhaps the GC
column has started to fail. If you wanted, we could try a Zoom call so you
can show me the behavior directly. Hit me up off-list if so. [...]

Re: Keeping GC Inlet Clean?

Jason Visser — Wed, 25 Feb 2026 11:57:31 -0600

Hi Jack

Thanks for the quick response and suggestion!

I ran the usual GC method and monitored the Ar value throughout (back flush
off). Nothing seems out of place. Everything cool and idle we get around
55 mV, over the course of the run it slowly rose to around 80 mV and never
spiked up when the system cooled. [...]

Re: Keeping GC Inlet Clean?

Jack Hutchings — Wed, 25 Feb 2026 09:22:45 -0600

Hi Jason,

I suspect you have a small, temperature-related leak in the flow path
within the GC. I'd recommend doing some of those test injections but
monitoring for Argon. If your "normal" Ar background is, say, 40-80 mV on
m/z 40, then at max oven temperature it might normally rise to 150-300 mV
or so with column bleed. If it rises much more than that or if it spikes
into the thousands as you come off the maximum temperature, then you almost
certainly have a leak within the GC and you'll need to find it. [...]

Job Alert - Postdoctoral researcher

Jeremy McCormack — Wed, 25 Feb 2026 04:20:14 -0500

Dear colleagues,

We have an opening for a postdoctoral researcher in ecogeochemistry and palaeobiology at the Goethe University Frankfurt (Germany). Please spread the word. Details below:

The Johann Wolfgang Goethe University Frankfurt am Main is one of the largest universities in Germany with around 41,000 students and with about 5,800 employees. Founded in 1914 by Frankfurt citizens and since 2008 once again proud of its foundation status Goethe University possesses a high degree of autonomy, modernity and professional diversity. As a comprehensive university, the Goethe University offers a total of 16 departments on five campuses and 155 degree programs along [...]

IsoSchool 2026 registration is open

IsoNet ECR — Tue, 24 Feb 2026 19:36:26 -0500

Dear members of the community,

Following the success of the inaugural IsoSchool at the 2024 Goldschmidt
Conference, we are pleased to announce the second edition of the
Isotopologue School (IsoSchool 2026), organized in coordination with the
10th International Clumped Isotope Workshop (ICIW10).

IsoSchool is a two-day short course dedicated to training and knowledge
exchange in isotopologue geochemistry. The program aims to provide a series
of lectures and tutorials focused on analytical and methodological
developments. It is designed primarily for early-career researchers
(Master’s students, PhD candidates, and postdoctoral fellows), as well as
laboratory technicians and scientists seeking to deepen their understanding
[...]

Keeping GC Inlet Clean?

Jason Visser — Tue, 24 Feb 2026 16:27:36 -0500

Hi everyone... I'm looking for a bit of help with some sticky/dirty samples we're running.

We've extracted fatty acids from sediments and methylated them. Ran them on our GC-FID to determine the amount to inject on our IRMS for dD analysis. All normal stuff. First few samples (3 injections each) run well enough, but very quickly the background signal increases and even when injecting clean samples (standards and/or just hexane) a similar high background is now observed: starts pretty normal and then increases with the GC oven temperature program. These samples shouldn't be this dirty and causing this much contamination, [...]

Contaminated 15N2 gas and its impact on N-fixation studies

Benjamin T. Uveges — Tue, 24 Feb 2026 18:28:36 +0000

Hello Isogeochem,

We have been getting involved with several projects recently that involve using a 15N2 tracer assay to quantify nitrogen fixation in a range of organismal symbiotic systems. Early on in the projects we kept getting rates of fixation that were beyond unbelievable, and d15N values in the 10’s of thousands. Turns out, the 15N2 gas cylinder we were using was contaminated, likely with unreacted ammonia and/or more oxidized N forms. [...]

USDA-ARS Postdoctoral Fellowship in Air Quality

Moore, Philip - REE-ARS — Tue, 24 Feb 2026 13:33:56 +0000

Hello,

USDA/ARS in Fayetteville, AR is seeking a highly motivated postdoctoral fellow to help conduct multidisciplinary research on reducing ammonia, dust, and pathogens from the air in poultry rearing facilities using a state of art air scrubber. The successful candidate will contribute to research projects focused on the development of management practices to reduce air and water pollution from manure, while improving the fertilizer value of this important resource. [...]

REMINDER- Invitation to submit abstract, Goldschmidt 2026, Session 03f Evolution of Earth from Detrital Archives

shreya mukherjee — Tue, 24 Feb 2026 11:00:11 +0100

Dear Researchers,

We are pleased to invite you to submit abstracts to our proposed session
03f entitled ‘Evolution of Earth from Detrital Archives’ at the upcoming
Golschmidt 2026, to be held in Montreal, Canada, 12-17th July 2026.

This session aims to bring together researchers working on detrital
minerals as recorders of crustal, mantle, and surface processes, with a
particular focus on how detrital mineral perspectives can be used to
reconstruct the evolution of the Earth’s crust through time. [...]

Postdoc position on critical minerals geochemistry at Duke University

Avner Vengosh, Ph.D. — Tue, 24 Feb 2026 01:12:09 +0000

Hello,

I would appreciate if you could publish the information on the postdoc position on critical minerals geochemistry at Duke University:

The Vengosh Laboratory at the Division of Earth and Climate Sciences of the Nicholas School of Environment seeks a highly motivated and talented postdoctoral researcher to study the geochemistry of critical minerals and the environmental implications of critical mining extraction and utilization. Integrated with the Critical Minerals Hub at Duke University, the Vengosh Laboratory investigates the geochemistry of critical minerals (e.g., lithium, rubidium, rare-earth elements) through the life cycle of mining, processing and utilization. We seek to develop geochemical [...]

Re: Carlo Erba EA1108 service manual?

li HUANG — Mon, 23 Feb 2026 14:15:42 -0500

Hi Ethan,

As Ryan mentioned, we do still have the machine and manual for EA 1108,
please contact me off line should you still need help.

Thank you,
li

On Fri, Feb 20, 2026 at 11:57 AM Ethan Goddard <
00000de27613465e-dmarc-request@list.uvm.edu> wrote:

> Isotopists, Does anyone have a service manual for the Carlo Erba EA1108
> that they’d be willing to share? My oxygen injection is misbehaving (I
> suspect the 6-port witching valve) and I’d love to have a service manual
> before I tear into it. Thank you.
>
> * Ethan A. Goddard *
> * USF College [...]

REMINDER: Goldschmidt 2026 Session 08c: Enhanced Rock Weathering: from Fundamentals to Applications

Minger Guo — Mon, 23 Feb 2026 11:47:26 -0500

Hi all,

The abstract deadline for Goldschmidt 2026 is fast approaching: this Thursday, February 26, 2026! We warmly invite you to submit your work to Session 08c: Enhanced Rock Weathering: From Fundamentals to Applications. https://conf.goldschmidt.info/goldschmidt/2026/meetingapp.cgi/Session/8747

This session focuses on fundamental and applied research on enhanced rock weathering (ERW) as a carbon dioxide removal technology. We welcome all research related to ERW, including but not limited to: modeling, laboratory, and field studies quantifying CDR through geochemistry, mineralogy, hydrology, soil science, isotopes, and other innovative tools in diverse spatial, temporal, and scale settings; studies assessing ERW impacts on soil–mineral–organic interactions, nutrient cycling, [...]

IsoCamp 2026 Application Deadline February 28th

Seth Newsome — Mon, 23 Feb 2026 16:01:00 +0000

Hi All..

We are pleased to announce that the IsoCamp summer short course (isocamp.org) will be held from June 15–26th 2026 at the University of New Mexico Center for Stable Isotopes in Albuquerque, NM USA. IsoCamp is a multi-instructor course with classroom lecture and hands-on laboratory/field experiences designed for graduate students and postdoctoral investigators interested in learning more about the application of stable isotopes. The course covers a wide range of topics in the natural sciences, including research themes in environmental, biogeochemical, geological, marine, archaeological, and ecological sciences. IsoCamp has a ~30-year history of combined lectures from preeminent researchers and [...]

Internship Advert - NIOZ

Elizabeth Yanuskiewicz — Mon, 23 Feb 2026 14:22:27 +0000

Please find and circulate the advertisement call for a student-based internship, ~6 months, based at NIOZ on Texel, Netherlands.

In ENG: Internship Primary productivity in the Wadden Sea using stable isotope (¹³C) | NIOZ - Royal Netherlands Institute for Sea Research<https://www.nioz.nl/en/about-nioz/education/internships-and-graduation-projects/internship-primary-productivity-in-the-wadden-sea-using-stable-isotope-13C>

In NL: Stage Primaire productiviteit in de Waddenzee met behulp van stabiele isotopen (¹³C) | NIOZ - Royal Netherlands Institute for Sea Research<https://www.nioz.nl/nl/over-nioz/onderwijs/stages-en-afstudeerprojecten/stage-primaire-productiviteit-in-de-waddenzee-met-behulp-van-stabiele-isotopen-13C> [...]

Fully funded MSCA PhD in Stable Isotope Geochemistry – PALPROX Doctoral Network

Alexia Serrano — Mon, 23 Feb 2026 10:07:37 +0100

Dear colleagues,

We would like to advertise a fully funded PhD position within the Horizon
Europe – Marie Skłodowska-Curie Actions Doctoral Network *PALPROX*
(“Proxies from small vertebrates in Prehistoric Archaeology”).

*IRP 6 – Stable isotope geochemistry and palaeoenvironmental reconstruction*

This project applies stable isotope and geochemical analyses to
micro-mammals in order to reconstruct past environmental and climatic
conditions. The research will integrate geochemical proxies with
palaeoecological and archaeological datasets to refine high-resolution
climate reconstructions. [...]

REMINDER: Goldschmidt 2026 Session 12f--Advances in understanding Earth’s geologic carbon cycle

Jeremy Caves Rugenstein — Sun, 22 Feb 2026 13:40:54 -0700

Hi all,

Just a reminder that the the Goldschmidt 2026 abstract deadline is fast
approaching--/next Thursday, February 26/.

We invite you to submit abstracts to session 12f
<https://conf.goldschmidt.info/goldschmidt/2026/meetingapp.cgi/Session/8737>--*Advances
in understanding Earth's geologic carbon cycle*--at Goldschmidt 2026
(July 12-17)
<https://conf.goldschmidt.info/goldschmidt/2026/meetingapp.cgi> in
Montreal.

This session focuses on the major advances that have occurred over the
past several years in our understanding of the geological carbon cycle
and the feedbacks (both positive and negative) that regulate Earth's
climate. [...]

Call for abstracts submission (deadline Feb 26): Goldschmidt 2026 Session 07c - "Lessons across the Great Oxidation Event: Implications for elemental cycling and ocean-atmosphere redox evolution"

Faizan Ahmad Khan — Sun, 22 Feb 2026 03:20:11 -0500

Dear colleagues,

We would like to circulate a reminder about our session at the Goldschmidt Conference 2026 (Montréal, Canada; 12–17 July 2026):

“Lessons across the Great Oxidation Event: Implications for elemental cycling and ocean–atmosphere redox evolution.”

We are pleased to share that Professor Andrey Bekker will deliver the keynote lecture for the session.
The session focuses on how Earth’s first major oxygenation event reshaped elemental cycles and the redox structure of the oceans and atmosphere. We welcome contributions spanning pre-, syn-, and post-GOE intervals, including studies employing redox-sensitive trace elements (e.g., Fe, Mo, U, S), stable and radiogenic isotopes, sedimentary [...]

functional Turbo Pump and controller

Srikanth Gedela — Fri, 20 Feb 2026 16:30:21 -0500

Hello everyone,

Please keep me in mind if you plan to lend, dispose of, or scrap any older but functional turbo pumps or controllers from IRMS systems. I would appreciate being informed and would be happy to discuss further.

Best
Srikanth
srikanth_gedela@brown.edu

Re: Carlo Erba EA1108 service manual?

Jon Cocca — Fri, 20 Feb 2026 19:58:38 +0000

Hi Ethan,

There is an exploded view diagram of the “Bimatic Valve in the Carlo Erba EA 1108 Manual. The issue is likely the replaceable diaphragm inside the valve or the pneumatic valve that controls the air flow to the valve. Contact me off-server if you need assistance. We have a lot of parts for the Carlo Erba, NA 1500, Series I & II, EA 1108, NA 2000 & 2500. [...]

Resolved: Carlo Erba EA1108 service manual?

Ethan Goddard — Fri, 20 Feb 2026 18:39:32 +0000

Thanks to all who replied. I have the likely guilty part ordered and on the way. Gainesville Florida’s most renowned isotopist gets a gold star!

Ethan A. Goddard
USF College of Marine Science
Tel: 727-553-1016
Mobile: 727-641-1772
Email: egoddard@usf.edu<mailto:egoddard@usf.edu>
Locations:
USF CMS Marine Environmental Chemistry Lab (MECLab)<https://www.usf.edu/marine-science/research/facilities-and-equipment/marine-environmental-chemistry-laboratory.aspx> - MSL223
USF CMS Tampa Bay Plasma Facility (HR-ICP-MS, MC-ICPMS)<https://www.usf.edu/marine-science/research/facilities-and-equipment/tampa-bay-plasma-facility.aspx> - MSL227D/H, KRC1123 [...]

Re: Carlo Erba EA1108 service manual?

Hladyniuk, Ryan — Fri, 20 Feb 2026 17:01:47 +0000

Dear Ethan,

The folks at Western University, Li Huang or Kim Law might be able to help. If still operational, they have the 1108.

R

Carlo Erba EA1108 service manual?

Ethan Goddard — Fri, 20 Feb 2026 16:51:54 +0000

Isotopists, Does anyone have a service manual for the Carlo Erba EA1108 that they’d be willing to share? My oxygen injection is misbehaving (I suspect the 6-port witching valve) and I’d love to have a service manual before I tear into it. Thank you.

Ethan A. Goddard
USF College of Marine Science
Tel: 727-553-1016
Mobile: 727-641-1772
Email: egoddard@usf.edu<mailto:egoddard@usf.edu>
Locations:
USF CMS Marine Environmental Chemistry Lab (MECLab)<https://www.usf.edu/marine-science/research/facilities-and-equipment/marine-environmental-chemistry-laboratory.aspx> - MSL223
USF CMS Tampa Bay Plasma Facility (HR-ICP-MS, MC-ICPMS)<https://www.usf.edu/marine-science/research/facilities-and-equipment/tampa-bay-plasma-facility.aspx> - MSL227D/H, KRC1123

Re: Triplus RSH 'non-basic' injections

Jack Hutchings — Fri, 20 Feb 2026 10:04:45 -0600

Hi Brian,

My experience with our Triplus RSH on Isodat is that the older software
version of the XCalibur software that acts as middleman has a few unseen
limitations on what you can do. For example, on a 10 uL syringe, I
literally cannot inject anything over 6 uL. It will have that same sort of
behavior you describe. We went back and forth w/ Thermo's technical staff
and the conclusion that was arrived at is that we simply have to work
around those issues as they came up. I am guessing that only the core
functionality was confirmed when [...]

Job Alert - Associate Professor in Earth Surface Processes

Stuart Robinson — Fri, 20 Feb 2026 14:52:43 +0000

Dear All

The Department of Earth Sciences at Oxford is looking to recruit someone working in Earth Surface Processes (very broadly defined!) to join our faculty as an Associate Professor (or Professor) with a Tutorial Fellowship at St Peter’s College. We are looking for an Earth Scientist seeking to understand the record, role and significance of sediments in the past, present, and future of Earth’s surface environment through research in fields such as earth surface processes, sedimentary geology, sedimentary and environmental geochemistry, and from those using expertise in a broad range of related disciplines. The closing date for applications is [...]

Triplus RSH 'non-basic' injections

Brian Giebel — Fri, 20 Feb 2026 13:29:35 +0000

Dear Isogeochemists,

We would like to perform a 'non-basic' injection using out Triplus RSH. The goal is to co-inject an internal standard along with a sample (pulled from two separate vials and having two solvent 'plugs' separated by air in the same syringe). While this seems theoretically possible in the software method settings - in practice, our Triplus is failing to perform the injection. Instead, it will start and complete a syringe wash and then immediately return to the home position. After a few seconds, the GC will start even though a physical injection was not made. [...]

Re: Los Gatos injector septa supplier for 6 mm high temperature septa

prashant Redkar — Fri, 20 Feb 2026 13:01:24 +0530

Hello All,
We have a LGR IWA-45EP in our Lab. I Saw some emails recommending Restek
septa for injector block. Can you pls specify which one you are using? 6mm
or the 9mm dia?
This will help as we are running out of stock for Trajan septa and it's no
more available now.
Appreciate your help.
Thanks & regards,
Prashant [...]

Reminder: GSA Rocky Mountain 2026 in Albuquerque--Paleoclimate Session

Jeremy Caves Rugenstein — Thu, 19 Feb 2026 14:40:48 -0700

Hi all,

Just a reminder that the abstract deadline for GSA Rocky Mountain in
Albuquerque is fast approaching--next Tuesday, Feb. 24!

We invite you to submit abstracts to our session at GSA Rocky Mountain
2026 in Albuquerque
<https://www.geosociety.org/GSA/GSA/Sections/rm/2026mtg/home.aspx> (May
17-20): Paleo-climate and -ecosystems of the Southwest and High Plains:
From the Paleozoic to the Quaternary.

Many Phanerozoic climates and ecosystems serve as potential analogues
for the future; others highlight the Earth system response to tectonic
and climatic forcings. We invite abstracts that probe the
paleoclimate/ecosystems of the US Southwest. [...]

Reminder: Goldschmidt 2026 - submit your abstracts for session 11c

Jo Jautzy — Thu, 19 Feb 2026 13:09:19 -0500

Full message available at: Reminder: Goldschmidt 2026 - submit your abstracts for session 11c

Reminder: Goldschmidt 2026 - submit your abstracts for session 09f

Peter Douglas, Dr — Thu, 19 Feb 2026 17:47:09 +0000

Dear Isogeochem,
Goldschmidt abstracts are due next week (February 26th)! Please consider submitting to Session 09f - Tracing Carbon Storage Across Reservoirs and Time: From Local Hotspots to Global Cycles<https://conf.goldschmidt.info/goldschmidt/2026/meetingapp.cgi/Session/8828>
This session welcomes contributions that apply geochemical and isotopic tracers to reconstruct carbon cycling across spatial and temporal scales. Studies may focus on terrestrial & aquatic paleoenvironmental archives and modern observations that document fluxes, burial, and transformations of carbon. We specifically welcome studies that integrate proxy application and development with modeling, or that combine isotopic, elemental, and molecular tools to highlight “carbon hot spots,” reveal land–sea linkages, and assess climate–carbon [...]

Goldschmidt 2026 session 03d- Fluids in the lithosphere

Rebecca Tyne — Thu, 19 Feb 2026 11:47:46 +0000

Dear colleagues,

We are pleased to announce “03d- Fluids in the lithosphere: Their origin, properties, metasomatic interactions and role in elemental cycling and energy transport"<https://conf.goldschmidt.info/goldschmidt/2026/meetingapp.cgi/Session/8990> as part of the Goldschmidt2026 conference, scheduled for July 12 to 17, 2025, in Montreal, Canada.

It will be our great honour to have Professor Barbara Sherwood Lollar (University of Toronto) as keynote speaker for this session.
While we would be pleased to welcome you in person in Montreal, the conference offers both in-person and virtual attendance options, but there will be only on-site presentations.
The deadline for abstract submission is February 26, 2026. We [...]

Goldschmidt Session 04d: Mineralogical perspectives on magmatic systems

Davies, Joshua — Wed, 18 Feb 2026 04:23:38 +0000

Planning to participate in the 2026 Goldschmidt Geochemical Conference in Montréal, Canada (12–17 July 2026)? Please consider submitting your abstract to our session:

Session 04d: A mineralogical perspective on the evolution of magmatic systems on Earth and beyond.

Recent analytical and methodological developments have enabled geoscientists to study the complex mineral cargo of magmatic rocks—including major, accessory, and xenocrystic minerals and their inclusions—with unprecedented detail. This has significantly enhanced our understanding of magmatic systems over a broad range of spatial, temporal and compositional scales on Earth and also on other planets and solar system materials. Despite these advances, there are [...]

Re: Thermo TCEA pressure switch part number

Robert Van Hale — Wed, 18 Feb 2026 00:04:41 +0000

Hi Jason
Here is the one I use
Element14
PN 2629783
0.3 bar
All the best
Rob

[Logo]
Robert Van Hale | Laboratory Technician Specialist - Instruments
a: Isotrace NZ Ltd | 167 High St Dunedin | New Zealand
e: rvanhale@isotrace.co.nz<mailto:rvanhale@isotrace.co.nz>
m: +64 022 310 6635

From: Stable Isotope Geochemistry <ISOGEOCHEM@list.uvm.edu> On Behalf Of Jason Curtis
Sent: Wednesday, 18 February 2026 11:29 am
To: ISOGEOCHEM@LIST.UVM.EDU
Subject: [ISOGEOCHEM] Thermo TCEA pressure switch part number [...]

Re: ASITA 2026 — Registration Open

Janzen, Kim — Tue, 17 Feb 2026 23:24:27 +0000

Registration is Now Open for ASITA 2026 at the University of Saskatchewan!

Join us for Advances in Stable Isotope Techniques and Applications (ASITA) 2026, taking place June 7–10, 2026.
Please refer to the posted schedule for tentative session times.

Registration Timeline

* Regular Registration: Now open until May 4, 2026
* Late Registration: Begins May 5, 2026
* Registration Closes: May 29, 2026 [...]

early or mid career atmospheric technician at Earth Sciences New Zealand

Peter Sperlich — Tue, 17 Feb 2026 22:41:38 +1300

Kia ora everyone,

Hope this email finds you well.

Our atmospheric research team at Earth Science New Zealand (formerly NIWA)
is looking for a reliable, skilled and fun person to enhance our team with.
This role includes working on isotopes in greenhouse gases, but
not exclusively. More details here:

SEEK: Atmospheric Technician Job in Wellington Central, Wellington - SEEK
<https://aus01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.seek.co.nz%2Fjob%2F90322516%3Fref%3Dsearch-standalone%26type%3Dstandard%26origin%3DjobTitle%23sol%3Ddd48a81130be66606c93657c220f53357a2dba67&data=05%7C02%7CPeter.Sperlich%40niwa.co.nz%7Ccb7e5332f0e04497a02408de6aa73657%7C41caed736a0c468aba499ff6aafd1c77%7C0%7C0%7C639065463575824390%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=reLiURnKvgPFPCZH%2BkcNiAp%2BQ4%2FD79j07f%2Fijyj%2Bi2A%3D&reserved=0> [...]

Thermo TCEA pressure switch part number

Jason Curtis — Tue, 17 Feb 2026 22:29:29 +0000

Hi Everyone,

I have a TCEA circa 2013. The pressure switch has failed for a second time. In 2017 the pressure switch that shuts off power to the furnace failed electrically. I purchased a new pressure switch then. Now that replacement pressure switch has fail and leaks helium. My issue is I have no record of part number nor where I purchased the replacement. [...]

Re: Announcing TICTOC exercise: Traceable Inter-Comparison of Triple Oxygen isotopes in Carbonate

Eiler, John M. — Tue, 17 Feb 2026 21:22:49 +0000

This sounds like a great project, well explained! One more type of activity you might consider is an experiment that can be repeated in any well equipped lab and that generates a result that can be compared with some theoretical frame of reference about which there is little debate. This approach has been important to the development of interlaboratory frames of reference for clumped isotope geochemistry (CO2, CH4, more recently H2), and I imagine could be similarly useful for this problem. Examples include a variety of processes that lead to highly predictable isotopic signatures; in the case of ∆17O this [...]

Announcing TICTOC exercise: Traceable Inter-Comparison of Triple Oxygen isotopes in Carbonate

Kelson, Julia — Tue, 17 Feb 2026 21:04:35 +0000

Dear Colleagues:

Work on ∆’17O in carbonates is expanding rapidly, with a growing number of laboratories and an increasingly diverse range of analytical approaches coming online. Given this momentum, we feel this is an ideal moment for the community to come together and undertake an inter-laboratory effort aimed at strengthening the metrological foundations of carbonate ∆’17O measurements across different analytical techniques and improving the comparability of standardization approaches across laboratories. In this spirit, we invite you to participate in TICTOC (Traceable Inter-Comparison of Triple Oxygen isotopes in Carbonates). [...]

Goldschmidt 2026 Call for abstracts: 08b - Rivers and watersheds in the Anthropocene: understanding Earth surface processes with Critical Zone Science

Ma, Lin — Tue, 17 Feb 2026 03:00:02 +0000

Dear all,

Abstract submission for the Goldschmidt Conference 2026 (Montréal, Canada July 12–17 2026) is now open, with a Feb 26 deadline! We are pleased to welcome abstract submissions to the following session:

08b - Rivers and watersheds in the Anthropocene: understanding Earth surface processes with Critical Zone Science (https://conf.goldschmidt.info/goldschmidt/2026/meetingapp.cgi/Session/8731)

This session invites contributions that explore Earth surface processes in watersheds through the lens of critical zone science, with an emphasis on forecasting and interpreting hydrological and biogeochemical responses under changing environmental conditions. We aim to convene scientists from across the globe to share and discuss recent advances in data [...]

Re: stability issues after source cleaning

gerard olack — Mon, 16 Feb 2026 20:41:41 -0600

HI Brett--

Yes, it much easier to trouble shoot when things are bad. I've been
dealing with my own gremlins. CO2 on-offs fine after a peak jump (from
N2), but drifting a bit if run on their own.

I presume you've played with focusing the individual lenses and see an
effect, i.e. everything is still connected--and since it's mostly
working, that's probably the case. [...]

Re: d18O on vanillan

Jack Hutchings — Mon, 16 Feb 2026 12:55:37 -0600

Hi Wolfram,

Yes, of course, it is obvious that the specific mechanisms for any exchange
reactions of lithium carbonate are not the same as for an organic compound
like vanillin. I was merely reminded of the LSVEC problem and did not
intend to imply that it is a 1:1 analog to the current discussion of
vanillin. Is it unreasonable to abstract a lesson about a material thought
to be relatively shelf stable that, instead, drifted over time? [...]

First Joint JpGU–AGU Meeting: Last Chance to Submit an Abstract

Hana Jurikova — Mon, 16 Feb 2026 18:36:27 +0000

Dear colleagues,

If you have not yet submitted an abstract, this is a friendly reminder
that the deadline for the *very first joint JpGU-AGU meeting
<https://www.jpgu.org/meeting_e2026/>, to be held from 24-29 May in
Chiba (Tokyo), Japan*, is fast approaching: *the abstract submission
deadline is Tuesday 17 February, 17:00 JST*. Do not miss the opportunity
to participate in this historic meeting! [...]

Re: d18O on vanillan

Wolfram Meier-Augenstein (Emeritus) — Mon, 16 Feb 2026 18:19:31 +0000

Hi Jack,

Captain Obvious here. ;-)

LSVEC, that is lithium carbonate (Li2CO3) is an inorganic compound and this not the only difference to vanillin.

When LSVEC was "certified" as RM and then distributed, it should have come with a note advising users to always keep it dry, ideally, by storing it in a desiccator in the presence of strong drying agent. The desiccator could either be put under vacuum or be kept at ambient pressure provided it was purged with dry N2 or dry Ar. [...]

teaching materials

Natasha Dimova — Mon, 16 Feb 2026 18:19:03 +0000

Dear colleagues,
I am relatively new to this group and have greatly appreciated the opportunity to follow the discussions thus far. My background is in radio tracers (radon and radium); however, I recently acquired a Picarro instrument and am planning to expand the use of stable isotope approaches in both my hydrological research and teaching.
I would be very grateful for any recommendations of teaching tools or materials that you have found particularly effective for (1) introducing the fundamental principles of stable isotopes in research, and (2) teaching their applications in hydrological studies.
Thank you very much in advance for [...]

iCESM User Survey: request for feedback from water isotope science communities

Sylvia Dee — Mon, 16 Feb 2026 11:16:04 -0600

Dear Colleagues,

On behalf of a large team from NCAR and Rice University, I write to inform
you of a project to implement sustainable water isotope tracers in the CESM
infrastructure <https://project.cgd.ucar.edu/projects/sci-swim/>. We'd
greatly appreciate 5 minutes of your time to provide feedback on this
multi-year project.

With thanks,
Sylvia Dee & Jiang Zhu

*Help Shape the Next Generation of Isotope-Enabled CESM (iCESM3): User
SurveyWater-isotope and water-tracking capabilities are returning to the
Community Earth System Model (CESM) through the SCI-SWIM project
<https://project.cgd.ucar.edu/projects/sci-swim/> (Sustainable Community
Infrastructure for Stable Water Isotope Modeling Enabling Earth System
Research), supported by the NSF Cyberinfrastructure for [...]

Re: d18O on vanillan

Jack Hutchings — Mon, 16 Feb 2026 09:51:51 -0600

Hi all,

Sorry if my short initial reply caused some strife. The observed isotope
exchange of such functional groups (
https://doi.org/10.1016/S0065-3160(08)60300-7) all occur under aqueous
conditions and often with modified pH and/or temperature. Presumably, if
you have dry vanillin powder, then it will have the d18O of the
source region with whatever biosynthetic offsets might exist. It is
entirely probable that dry storage of a pure vanillin standard will have
practically constant d18O for many years or possibly much longer. Of
course, without demonstration of a negligible exchange rate, perhaps it
does drift meaningfully when exposed to sufficient humidity. I [...]

Goldschmidt 2026, Session 09i-Sequestration of Carbon in Aquatic Sediments

Yeganeh Mirzaei — Sun, 15 Feb 2026 22:13:20 -0500

Dear All,

We would like to invite abstract submissions to our upcoming session at Goldschmidt 2026; Session 09i - From Source to Sink: Sequestration of Carbon in Aquatic Sediments. Goldschmidt will be held in Montreal, July 12-17, 2026. We invite insights from experimental, observational, and modelling approaches to join us and deepen the understanding of biotic and abiotic processing of carbon in aquatic systems and sediments. [...]

Re: d18O on vanillan

Bojar Ana-Voica — Sat, 14 Feb 2026 22:52:09 +0000

Hi there,

As vanillin is a phenolic aldehide (with 3 mixed groups, also OH) and it is soluble in water (10g/L), it should show some correlation with the annual precipitation in the region.

Best,

Ana- Voica

Re: d18O on vanillan

Wolfram Meier-Augenstein (Emeritus) — Sat, 14 Feb 2026 21:37:38 +0000

Adding to Gerry's list: coumarin.

W. 8-)

Sent from Outlook for Android<https://aka.ms/AAb9ysg>

Re: d18O on vanillan

GROCKE, DARREN R. — Sat, 14 Feb 2026 20:41:27 +0000

Hi Jack
I have been working with a group undertaking FT-ICR-MS and they wanted a lab to do bulk d18O on the vanillin.
What surprised me was that the bulk d18O closely matched the annual precipitation d18O value of the regions it was sourced from…
I knew there was oxygen exchange but mostly in aqueous solutions, whereas under atmospheric conditions it is mainly the phenolic OH, but depends on RH level. Hence why Wolfram states it is ok in a good dessicator.
Cheers
Darren [...]

Re: d18O on vanillan

gerard olack — Sat, 14 Feb 2026 14:12:27 -0600

HI All--

And just a side note--avoid storing organic compounds such as caffeine,
vanillan, or anything that's purified by sublimation, under vacuum.

;)

take care,

gerry

On 2/14/2026 12:12 PM, Wolfram Meier-Augenstein (Emeritus) wrote:
> Dear all,
>
>
> To qualify my prior message, the statement made about lack of oxygen
> exchange, hydroxyl-exchange actually, not being a thing refers to the
> normal storage conditions of solid organic reference materials exposed
> only to water if form of ambient humidity.
>
> Organic ketones (and aldehydes) can of course react with water which
> may result in an [...]

Re: d18O on vanillan

Bojar Ana-Voica — Sat, 14 Feb 2026 19:51:51 +0000

How interesting.

A small comment: epoxydes, which are ethers are hydrolising also in water forming 1, 2 diols (some temperature is required 60 -100 C).

Best,

Ana-Voica

Re: d18O on vanillan

Wolfram Meier-Augenstein (Emeritus) — Sat, 14 Feb 2026 18:12:18 +0000

Dear all,

To qualify my prior message, the statement made about lack of oxygen exchange, hydroxyl-exchange actually, not being a thing refers to the normal storage conditions of solid organic reference materials exposed only to water if form of ambient humidity.

Organic ketones (and aldehydes) can of course react with water which may result in an hydroxyl exchange and, ultimately, an oxygen exchange. However, such reactions take please in (aqueous) solution, in the presence either of an acid (or a base) or a catalyst. Similarly, in aqueous solution and in the presence of acid the hydroxyl group of an alcohol [...]

Re: d18O on vanillan

Wolfram Meier-Augenstein (Emeritus) — Sat, 14 Feb 2026 17:51:04 +0000

Dear all,

Keeping one's powder dry is certainly good advice for storage of any (in-house) standards and reference materials, however not because oxygen exchange (be it as oxygen atom or as hydroxyl group) with water is a thing, let alone would present an acute, clear, and present danger for organic compounds. [...]

Goldschmidt session on Archaeometry

Mostafa Fayek — Fri, 13 Feb 2026 21:26:28 +0000

Dear All,

I would like to bring to your attention the following session at the Goldschmidt meeting in Montreal, Canada, July 12-17. Abstract submission deadline: February 26.

Theme 06: Analytical and Computational Frontiers

Session Title: Tracing the Past: Analytical, Isotopic and Geochemical Frontiers in the Archaeology of Metals and Earth Materials

Conveners: Ryan Mathur (MATHURR@juniata.edu), Mostafa Fayek (mostafa.fayek@umanitoba.ca), Jacob J Hanley (jacob.hanley@smu.ca), Wayne Powell (wpowell@brooklyn.cuny.edu). [...]

GAC-MAC special session on uranium

Mostafa Fayek — Fri, 13 Feb 2026 21:10:28 +0000

Dear All,

I would like to bring to your attention the following session at the GAC-MAC meeting in St. John's Newfoundland, Canada, May 25-28. Abstract submission deadline: February 21.

Special Session SS-06

Title: The Next Wave of Yellowcake: Exploring Untapped Uranium Resources

Conveners: Erin Adlakha (Erin.Adlakha@smu.ca), Guoxiang Chi (Guoxiang.Chi@uregina.ca); Mostafa Fayek (Mostafa.Fayek@umanitoba.ca)

This special session invites all contributions on uranium mineral systems, particularly uranium deposits within the Atlantic Canada region (Nova Scotia, New Brunswick, and Newfoundland and Labrador) as well as the broader Appalachian Orogen. As the global energy transition accelerates to address climate change, reliable low-carbon energy sources, including [...]

Re: d18O on vanillan

Jack Hutchings — Fri, 13 Feb 2026 13:09:27 -0600

Hi Darren,

As far as I know, practically all of the oxygens in something like vanillin
(hydroxyl, carbonyl, and methoxy) are exchangeable with water. I'm sure
everyone stores their aliquots dry, but I wouldn't be surprised if
different batches of them 'drift' in d18O over time. I am guessing that,
perhaps, you have measured them... I'm curious as to why? [...]

d18O on vanillan

GROCKE, DARREN R. — Fri, 13 Feb 2026 17:10:27 +0000

Hello
Has anyone out there generated d18O data from two d13C standards (VANA-1 and VANB-1). If yes I’d love to know what value you obtained.

Cheers
Darren

Prof Darren R. Gröcke

Stable Isotope Biogeochemistry Laboratory (SIBL)
Department of Earth Sciences/Archaeology
Durham University
South Road, Durham
County Durham
DH1 3LE, UK

https://scholar.google.co.uk/citations?user=kYv6BFcAAAAJ&hl=en
@GrockeSIBL

Early Career Geosciences Faculty Workshop 2026

Mea Cook — Fri, 13 Feb 2026 11:47:47 -0500

Early Career Geoscience Faculty Workshop 2026

June 21-25

Macalester College, MN

Application Deadline: March 31, 2026

https://serc.carleton.edu/NAGTWorkshops/earlycareer2026/index.html

If you are in your first three years of a faculty position, please apply to
join us for a multi-day workshop in a stimulating and resource-rich
environment where you will participate in sessions on topics including
effective teaching strategies, course design, establishing a research
program in a new setting, working with research students, balancing
professional and personal responsibilities, and time management.
Participants must have a faculty position at a two-year or four-year
college or a university at the time of the workshop and [...]

Goldschmidt 2026 Call for Abstracts | From Rock to Soil: Elemental Cycling in the Critical Zone

Xiao-Ming Liu — Fri, 13 Feb 2026 08:45:31 -0500

Dear colleagues,

Abstract submission for the Goldschmidt Conference 2026, to be held in Montréal, Canada (12–17 July 2026), is now open, with a Feb 26 deadline! We are pleased to invite abstract submissions to the following session:

08a - From Rock to Soil: Elemental Cycling in the Critical Zone.

The Critical Zone represents the dynamic interface where rock, water, air, and life interact to transform minerals and generate soils. Elemental cycling begins with incipient weathering and drives the processes that control nutrient availability, soil formation, and long-term ecosystem sustainability. This session invites contributions that advance our understanding of these transformations [...]

Call for Abstracts: INQUA2027 Session on "Common Era (~2k) Hydroclimate"

Anupam — Fri, 13 Feb 2026 17:03:38 +0530

Dear colleagues,

We would like to draw your attention to our session at the upcoming *XXII
INQUA Congress 2027 <https://www.inquaindia2027.in/>* in Lucknow,
India (*January
28 - February 3, 2027*).

Abstract submission deadline: *15 February 2026*:
https://www.inquaindia2027.in/call-submissions

Our session *Common Era (~2k) Hydroclimate*
<https://www.inquaindia2027.in/sessions/s-077> invites contributions
covering, but not restricted to:

1) Climate reconstructions for the last 2000 years (Common Era) using, but
not limited to: tree rings, speleothems, corals, marine or lake sediments,
and historical documentation.
2) Modern climate, including observational and rainfall isotope studies and
teleconnections.
3) Proxy data and climate model comparison studies focused on Common Era
hydroclimate [...]

Clumped and Triple oxygen isotopes session at XXII INQUA Congress, India 2027

Prasanna K — Fri, 13 Feb 2026 10:39:31 +0530

Dear colleagues,

Gentle Reminder.

The XXII INQUA Congress will be held in Lucknow, India, from 28 January to
3 February 2027— marking the first time this prestigious meeting will take
place in India.

We are pleased to invite abstract submissions to the following session:

S.152_Clumped and Triple Oxygen Isotopes in Quaternary Marine and
Continental Sediments: Advances in Paleoclimate and Paleoenvironmental
Reconstructions [...]

Job opening: Asst. Prof. in Geological Oceanography at University of Alaska Fairbanks

Shannon Doherty — Thu, 12 Feb 2026 15:28:13 -0900

Hello Isogeochem community:

The UAF College of Fisheries and Ocean Sciences is *hiring an Assistant
Professor of Geological Oceanography*. We are particularly interested in
candidates with expertise in active processes of *geochemistry, sediment
dynamics, or related fields*. The candidate must have the ability to teach
the graduate core course in Geological Oceanography and courses for the
graduate and undergraduate academic programs. [...]

Paleofire session at XXII INQUA Congress, India 2027

Beaudon, Emilie — Thu, 12 Feb 2026 13:44:26 +0000

Dear All,

The XXII INQUA Congress will be held in Lucknow, India, from January 28 to February 3, 2027!
We invite you to submit your abstracts to “Wildfire Through Time: Integrating Paleofire Records, Climate Models, and Ecosystem Dynamics"
This session is relevant for Quaternary Researchers working on paleofire, climate-fire interactions, multi-proxy records, modelling, and ecosystem dynamics, offering a supportive platform for presenting emerging ideas, interdisciplinary approaches, and new datasets.
Keywords: Paleofire, Fire–climate interactions, Multi-proxy analysis, Environmental changes, Policy
For more details: https://www.inquaindia2027.in/sessions/s-080 [...]

Call for abstracts submission: Goldschmidt 2026 Session 07c - "Lessons across the Great Oxidation Event: Implications for elemental cycling and ocean-atmosphere redox evolution"

Faizan Ahmad Khan — Thu, 12 Feb 2026 03:37:16 -0500

Dear colleagues,

We would like to invite abstract submissions to our session at the Goldschmidt Conference 2026 (Montréal, Canada; 12–17 July 2026):

“Lessons across the Great Oxidation Event: Implications for elemental cycling and ocean–atmosphere redox evolution.”

This session focuses on how Earth’s first major oxygenation event reshaped elemental cycles and the redox structure of the oceans and atmosphere. We welcome contributions spanning pre-, syn-, and post-GOE intervals, including studies employing redox-sensitive trace elements (e.g., Fe, Mo, U, and S), stable and radiogenic isotopes, sedimentary archives, and modelling approaches. We especially encourage submissions that explore redox heterogeneity, trace-metal cycling, basin-to-global perspectives, [...]

Goldschmidt 2026 Session: Biogeochemical Cycles at the Land-Ocean Continuum

Yogaraj Banerjee — Wed, 11 Feb 2026 21:35:19 -0500

Dear Colleagues,

We invite you to submit an abstract to our session Biogeochemical cycles at
the Land-Ocean continuum: Past, Present and Future
<https://conf.goldschmidt.info/goldschmidt/2026/meetingapp.cgi/Session/9023> at
Goldschmidt 2026 in Montreal, Canada (July 12–17, 2026).

*Session Description:*

The land-ocean continuum—spanning rivers, estuaries, coastal wetlands, and
continental margins—plays a critical role in global biogeochemical cycles.
This dynamic interface regulates the transport, transformation, and fate of
carbon, nutrients, and other elements between terrestrial and marine
reservoirs. Understanding these processes is essential for constraining
global elemental budgets and predicting responses to environmental change. [...]

Drying of SO2 "ref gas"

Wed, 11 Feb 2026 16:29:16 +1300

Hi all,
Has anyone tried using a drying trap on their SO2 supply line?
I can appreciate that SO2 might be the most difficult to purify of the gases
used in the IRMS lab, and on top of that we have been using what might be
described as "Food grade" SO2, the only product available locally from BOC.
The BOC spec sheet for this product admits to moisture at 200ppm.
Our lab is questioning whether this moisture contributes to tailing and
memory effects in sulphur measurements. Typical sample types are providing a
peak area for the sample of just 1/10th [...]

Associate Professor/ Assistant Professor in Earth and Environmental Sciences

Benoit Thibodeau — Tue, 10 Feb 2026 16:23:57 +0800

The Department of Earth and Environmental Sciences of the Faculty of
Science (https://www.ees.cuhk.edu.hk/) invites applicants for a
tenure-track Assistant Professor or Associate Professor position at the
Chinese University of Hong Kong. The Chinese University of Hong Kong (CUHK)
is a leading international research university committed to academic
excellence and holistic education. Established in 1963, CUHK ranks 32nd
globally in the QS World University Rankings 2026—its highest position to
date. English is the primary language of instruction, and the campus hosts
a diverse community of students and scholars from around the world. A
distinctive feature of CUHK is its collegiate system, [...]

GAC-MAC 2026 Call for Abstracts - Session SS-11: Geochemical Signatures of Terrestrial Processes

Samantha Turtle — Mon, 9 Feb 2026 16:54:08 -0500

Hi all,

On behalf of my co-conveners and I, I’m excited to invite you to submit abstracts to Session SS-11: Geochemical Signatures of Modern Terrestrial Processes at GAC-MAC 2026, taking place in St. John’s, May 25–28, 2026.

Conveners: Louis Yun, Michael Babechuk, Sam Turtle

Session description:

Connections between modern terrestrial surface processes and their geochemical signatures are crucial to understand Earth’s dynamic surface and its preservation in geological archives. Advances in analytical techniques in geochemistry now enable detailed tracing of metal mobility, weathering reactions, and element and nutrient cycling across soils, vegetations, river systems, and weathering fronts. Integrating geochemical and biogeochemical perspectives reveals how redox dynamics, mineral-microbe interactions, and nutrient-metal coupling regulate elemental fluxes and isotopic fractionation in terrestrial environments. Recognition of these coupled geochemical and biogeochemical signatures provides powerful tools for improving paleoenvironmental reconstructions, assessing anthropogenic impacts, and predicting future trajectories of Earth surface systems under changing climate and land use. This session invites contributions that explore modern terrestrial processes through major/ trace element geochemistry, isotope geochemistry, chemo-stratigraphy, biogeochemical cycles, statistical analysis of large datasets, integrative modeling, and/or other aspects to illuminate the pathways linking active surface processes to their geochemical products. Our goal is to bring together researchers across both geochemistry, biogeoscience, geomorphology, and sedimentology to foster new collaborations and research directions that deepen our understanding of the geochemical dimensions of modern surface processes.

We encourage contributions on topics such as:

Major and trace element geochemistry
Isotope geochemistry
Chemo-stratigraphy
Biogeochemical cycles

Conference & submission details:

Conference: GAC-MAC 2026

Location: St. John’s, Newfoundland,

Canada Dates: May 25–28, 2026 (the beginning of Whale and Puffin Season on the Island!)

Abstract deadline: February 21, 2026

Abstract Submission Link

We hope this session attracts a wide range of researchers, from all career stages, and fosters new discussions and collaborations. Please feel free to share this announcement with colleagues, students, and anyone who may be interested!

Best,

Sam Turtle (she/her)

MSc Student, Earth Sciences

Biogeochemistry of Boreal Ecosystems Research Group

Memorial University of Newfoundland, NL, Canada

Re: d18Ophosphate

Huiming Bao — Mon, 9 Feb 2026 08:13:21 +0000

Dear Steve, Federica, and all who are interested in analyzing δ18O-PO4 from various matrices:

I may not have read all the posters in this thread, but what I got from Federica in this poster is that using Orbitrap-MS to measure δ18O-PO4 is not ready (there) yet.

I am afraid I must declare that we do not agree with Federica's statement. [...]

Reminder : Invitation to submit an abstract to the Goldschmidt 2026 session 10c: Tracers and models to assess the dynamics of water and fluid systems

Barbecot, Florent — Mon, 9 Feb 2026 03:03:54 +0000

Dear colleague

We – Rolf Kipfer, Kip Solomon, John Gibson, Alan Seltzer, Benjamin Fisher, and I - are pleased to announce Session 10c - Tracers and models to assess the dynamics of water and fluid systems<https://conf.goldschmidt.info/goldschmidt/2026/meetingapp.cgi/Session/8714> as part of the Goldschmidt 2026 conference, scheduled for July 12 to 17, 2025, in Montreal, Canada. [...]

Re: d18Ophosphate

Federica Tamburini — Sat, 7 Feb 2026 02:14:07 -0500

Hi Steve,

apologies for the late reply, busy months. Within the project I am working on, we have just published a paper on analysing 18O in phosphate with the Orbitrap (Bernet et al, 2025). as you can read, mixed feelings, it would be great, I have the impression we are not there yet. Drop me a line and we can set up a meeting. Cheers,

Re: [Requesting Help] Monthly/Annual δ¹⁸O precipitation values

Gabriel Bowen — Fri, 6 Feb 2026 21:28:29 +0000

Ritvik -

You can always look at http://waterisotopesDB.org to see what's been shared/compiled there (or use the isoWater R-package to query the wiDB). I believe there are a lot of water isotope data that have been collected in the subcontinent over the past decade or two that are not yet reflected in the wiDB, but in terms of public data that you would be sure to have access to the IAEA/GNIP site at New Delhi is probably the closest to your study area. [...]

Announce: International Conference on Radionuclide Metrology Low-Level Radioactivity Measurement Techniques

Leonard Wassenaar — Fri, 6 Feb 2026 16:19:04 -0500

Dear colleagues -

We are pleased to announce the 9th International Conference on Radionuclide
Metrology Low-Level Radioactivity Measurement Techniques, to be hosted by
the University of Ottawa, Canada, from Monday, September 14 to Friday,
September 18, 2026. Conference details are here:

https://icrmllrmt2026.vfairs.com/

Mark your calendars - abstract and registrations will be opening soon.

Len

Leonard I. Wassenaar, PhD. [...]