We would like to draw your attention to our upcoming session at the EGU General Assembly 2026 in Vienna, Austria (3 - 8 May 2026). Our session AS3.42: Greenhouse gas and tracer observations: calibration, harmonisation, and cross‑network consistency<https://www.egu26.eu/session/57177> invites contributions covering, but not limited to:
1. Calibration strategies and uncertainty quantification for greenhouse gases (CO2, CH4, N2O) and complementary tracers (e.g., δ13C(CO2), δ18O(CO2), δ13C(CH4), δ2H(CH4), 14CH4, 14CO2, radon) 2. Interlaboratory comparisons, traceability chains, and harmonisation across measurement networks 3. Advances in metrology for in situ atmospheric observations, including UAVs, mobile platforms, and low-cost sensor networks 4. Integration of
We recently discovered that the Penning gauge on Delta V and earlier vintage instruments has been discontinued and is now replaced with a new version, the AIM200.
Has anyone had success using the replacement AIM200 Gauge with Thermo Delta instruments equipped originally with AIM XL Gauges? Any advice or issues you can share are greatly appreciated.
Yes - it works! and as a bonus it is less bulky than the old version. There's a different way to check and adjust the setpoint (ie. no set screw on the gauge), and I will check my notes when back in the lab as to specifics and let you know.
Linda.
On Fri, Dec 5, 2025 at 5:52 PM Benjamin Harlow <[log in to unmask]> wrote:
Have any of you dealt with vibrations strong enough to affect your IRMS? Thermo has spec's for the 253 and Delta: "The maximum acceptable amplitude is 10 um (peak to peak) movement for all frequencies above 30 Hz." I'm looking at moving an IRMS to a room with some vibration and am arranging for it to be measured and quantified, but while I wait I have questions:
Interesting one. I can't imagine why IRMS's should be particularily sensitive to vibration. As long as the magnet doesn't get shaken out of its alignemt... But would be good to hear if anyone has experience with a jackhammer going off next door. cheers Chris
On Sat, 6 Dec 2025 at 04:30, Paul Eby <[log in to unmask]> wrote:
> Listmembers, > > > > Have any of you dealt with vibrations strong enough to affect your IRMS? > Thermo has spec’s for the 253 and Delta: “The maximum acceptable amplitude > is 10 um (peak to peak) movement for all frequencies above 30
The filament might be very sensitive to vibration?
Am 06.12.25 um 05:53 schrieb CHRISTIAN DIETZ: > Interesting one. > I can't imagine why IRMS's should be particularily sensitive to > vibration. > As long as the magnet doesn't get shaken out of its alignemt... > But would be good to hear if anyone has experience with a jackhammer > going off next door. > cheers > Chris > > > On Sat, 6 Dec 2025 at 04:30, Paul Eby <[log in to unmask]> wrote: > > Listmembers, > > Have any of you dealt with vibrations strong enough to affect your > IRMS?
Yes, I was thinking filaments also. Also the push on plate connectors under spring tension could work their way loose.
Bill
William Rugh Manager, Stable Isotope Lab College of Earth, Oceanic and Atmospheric Sciences Oregon State University [log in to unmask]<mailto:[log in to unmask]> (541) 737-1203 https://ceoas.oregonstate.edu/oregon-state-stable-isotope-collaboratory/
From: Stable Isotope Geochemistry <[log in to unmask]> On Behalf Of Stefan Schloemer Sent: Saturday, December 6, 2025 10:35 AM To: [log in to unmask] Subject: Re: [ISOGEOCHEM] IRMS and floor vibrations
I have a visitor working in my lab and we would like to dissolve barite rocks to analyze organic matter for C and N isotope values. We are worried about potential contamination if we use nitric acid or organic acids. We might be able to analyze C isotope values in organic carbon without barite dissolution, but we would like to concentrate organic matter for N isotope analyses as these rocks likely do not have much nitrogen left.
The steering committee is delighted to announce the second edition of IsoSchool (2026) <https://iciw10.sites.uu.nl/isoschool-2026/> which will take place at Utrecht University (Netherlands) on June 22–23, 2026, immediately preceding the 10th International Clumped Isotope Workshop <https://iciw10.sites.uu.nl/> (ICIW10) (June 24–26, 2026).
*About IsoSchool:* IsoSchool is a two-day short course dedicated to training and knowledge exchange in isotopologue geochemistry. The aim of the school is to provide a series of lectures and tutorials focused on analytical and methodological developments, rather than scientific applications. It is designed primarily for early-career researchers (Master’s and PhD students, Post-doctoral fellows) as well as laboratory technicians
We seem to have a vial contamination issue, likely some sort of organic, and I'm wondering if it's coming from our dishwasher.
Does anyone have suggestions for cleaning a laboratory dishwasher?
Ours is primarily used to clean glassware for carbonate stable isotope analysis. It's a Miele, came with a large supply of neodisher LaboClean A8 powder that I'm still working through after 5 years, and neodisher neutralizer. I swapped the neutralizer to plain citric acid some time ago, as neodisher reformulated to include weird stuff I was concerned about, but that swap didn't coincide with
We don’t use a dishwasher for our glassware so I cannot directly answer your question. But after the glassware are washed and dried, combusting them (wrapped in Aluminium foil) in a Muffle furnace at 450degC for 4 hours should remove organic contaminants.
Best, Rupa.
Dr. Pratirupa Bardhan, she/her/hers Research Assistant Professor, Dept of Geology & Environmental Science University of Pittsburgh.
Dear Sevi, If you are doing carbonate isotopic analysis, then your primary concern should be carbonate resides from the washing water, and from your carbonate samples. We wash by hand with Alconox lab soap, then soak in a tank of undiluted H2SO4 (sulfuric acid) with Nochromix overnight. Wear appropriate safety equipment when using the acid bath and rinsing. After rinsing with tap water, a final rinse with demineralized (scale eliminator filter cartridge) distilled water removes tap water residues. The final rinse leaves no water spots on the dry glassware. We do not use deionized water piped in from a central
I have been working on phosphorus in Utah Lake, Utah, USA. It’s a large (380km2) shallow eutrophic lake adjacent to an urban corridor.
If there’s anyone out there who is willing to let me pick their brain regarding separation and purification of aqueous phosphate I would appreciate it. I’ve read some of the literature about sample preparation, but I am likely to have some questions.
Aric Mine did some nice work when he was in Albert Colman's lab, fast micro-precipitation of silver phosphate.
Gabriele Larocca Conte, et al. in Sora Kim's lab, followed that up by adding in a clean up step using ion exchange resin to remove organics (and chlorides?).
See (yes, generated from Zotero):
Mine, A. H., A. Waldeck, G. Olack, M. E. Hoerner, S. Alex, and A. S. Colman. 2017. “Microprecipitation and δ18O Analysis of Phosphate for Paleoclimate and Biogeochemistry Research.” /Chemical Geology/ 460 (Supplement C): 1–14. https://doi.org/10.1016/j.chemgeo.2017.03.032.
Please find below the description of a two year postdoctoral position at Lawrence Berkeley National Laboratory and the Department of Earth and Planetary Science at UC Berkeley. The position is focused on mineral synthesis and associated isotope effects. Please feel free to share widely.
Please also feel free to contact me ([log in to unmask] <mailto:[log in to unmask]>) with any questions. Applications will begin being reviewed at the end of December and the position will stay open until filled.
The Spivak Coastal Biogeochemistry Lab seeks a Postdoctoral Researcher interested in exploring variability in tidal wetland ecosystems. Variability in abiotic drivers can be useful in predicting ecosystem trajectories while ecological variability can be a metric of behavior. The postdoc will contribute to field and lab experiments testing these ideas within the wetlands of the Georgia Coastal Ecosystems Long-Term Ecological Research (GCE-LTER) project. Experiments will build on 25+ years of data collected by GCE-LTER’s multi-disciplinary team.
Does anyone have an old Trace GC Ultra, with a PTV inlet that they’d be willing to part with? Our PTV inlet body (Thermo part number 29902263) has a shorted temp sensor, and it’s out of service and out of stock. It’s a long shot, I know!
I had a question, not related to the meeting but a personal one. Is any one familiar with a soft ware to organize bibliography , specifically, Chicago Style end notes. This is to help some one who has written a book with 700 references and would like to avoid entering them by hand.Thanks
Plus 1 for Zotero. Exports in most styles. Excellent ingest via DOI etc. Free for modest usage.
andy
***** *Question about the lab?* ***** ***** Search our website <https://isolab.ess.washington.edu/> *****
Andrew Schauer | he/him IsoLab Manager *https://isolab.ess.washington.edu/ <https://isolab.ess.washington.edu/>*
On Tue, Dec 2, 2025 at 05:56 Stefan Schloemer < [log in to unmask]> wrote:
> From the public domain software section I would recommemd Zotero. > Stefan > -- > Gesendet mit der GMX Mail App > > > Am 02.12.25, 13:14 schrieb R V Krishnamurthy > <[log in to unmask] > <https://urldefense.com/v3/__http://list.uvm.edu__;!!K-Hz7m0Vt54!jLzqk3_WgFh9NHQ1maakn2hzBSAiIWoMuK9qR0zS02CW2UtJQzH4Rh2Yre1G8ZbK6h7fJhfSXaG6aPlvseA9aQBI7uLLGug$> > >: >> >> I had a question, not related to the meeting but
+1 for Zotero. See everyone else's recs, plus excellent plugin for most browsers to add to Zotero automatically. Has plugins for Office, Google Docs, etc to add citations to document smoothly.
*Hanna Brooks (she/her)* Ph.D. Candidate School of Earth and Climate Sciences Climate Change Institute University of Maine
*The University of Maine recognizes that it is located on Marsh Island in the homeland of the Penobscot Nation, where issues of water and territorial rights, and encroachment upon sacred sites, are ongoing. Penobscot homeland is connected to the other Wabanaki Tribal Nations — the Passamaquoddy, Maliseet, and Micmac — through kinship,
Personally, I prefer Endnote - commercial software (though our university has a site license) - but I find it more stable and easier to input references than Zotero.
Just a note, if your have different people using different programs, e.g. MS vs. Libre Office, and work on the same document, the bibliographic settings may not be compatible. It can change with versions too.
Basically, you have to encode the bibliography as "bookmarks" in MS Word to be compatible with Libre Office
On 12/2/2025 8:49 AM, Hanna Brooks wrote: > +1 for Zotero. See everyone else's recs, plus excellent plugin for > most browsers to add to Zotero automatically. Has plugins for Office, > Google Docs, etc to add citations to document smoothly. > > *Hanna Brooks
On Tuesday, December 2, 2025, 11:13 AM, gerard olack <[log in to unmask]> wrote:
Just a note, if your have different people using different programs, e.g. MS vs. Libre Office, and work on the same document, the bibliographic settings may not be compatible. It can change with versions too.
Just passing along a tenure-track faculty job posting at our campus (Appalachian Laboratory at the University of Maryland Center for Environmental Science). Isotopes are not the primary focus, but if the right candidate is interested, we could collaborate!
We invite applications from individuals who will develop an internationally recognized, externally funded research program focused on watersheds and water resources. Candidates whose research can address challenges that are relevant to the Appalachian Mountain region or the Chesapeake Bay watershed are especially encouraged to apply.
I'm on the look out for a partner lab for a project mapping the sources of nitrate in a freshwater catchment. I will have regular water samples from a variety of locations and will be looking for both d2h & d18O of water and d15N & d18O of nitrate. Project is based in Ireland so a European lab would be preferable... Happy to chat etc if this is in your wheelhouse!
Dear Isotope Enthusiasts, This survey is intended for laboratories and researchers who measure CH₄ stable isotopes. Your expertise is essential for building a comprehensive picture of global capabilities.
The survey is organised by the CH₄ Task Team of the CCQM-IRWG/GAWG Task Group on CO₂ and CH₄ Stable Isotope Ratio Measurements<https://www.bipm.org/en/committees/cc/ccqm/wg/ccqm-gawg-irwg-tg-isotop>, under the Consultative Committee for Amount of Substance (CCQM<https://www.bipm.org/en/committees/cc/ccqm/>).
Very pleased to share that the Survivors Guide to Stable Isotope Ecology will be back for our 7th edition in March of 2026. This is a wonderful opportunity to learn from some of the very best in the field (and me!) in a relaxed, friendly environment and a truly unique location.
We usually run Kiel Device sequences with teeth and bones, and all your comments have been very useful, thanks. I agree with Chris, it will be great if we could arrange a certification campaign for a positive d18O reference carbonate. Not only for calcite in bioapatite, but also for eggshell or diagenetic carbonates. We usually run samples like that, and they normally show positive d18O values. OK, we can use 2 or 3 point standarization with IAEA 603, 610 and 611. But having a positive d18O carbonate would be nice.
thank you for all the useful comments. Food for thought:) May be time to organise a certification campaign for a calcite with positive d185O? (count me in) And sample treatmewnt tbd on a case by case basis.. cheers Chris
On Sun, 30 Nov 2025 at 00:01, Ambrose, Stanley H <[log in to unmask]> wrote:
> Hello Chris, > > > > If you are analyzing fresh bone then it should be ground to less than > 0.125 mm. High concentrations of fats and proteins can impede complete > reaction and slow its reaction rate with H3PO4, which would require longer > time for
