Hi Chris,


Rule-of-thumb figures would be to expect d2H values +250 to +300 ‰ and d18O values of about +100 ‰ on day +1, dropping to +100 to +200 ‰ (d2H) and about +50 ‰ on day +5.

My suggestion would be to get in touch with the Reston Stable Isotope Lab of the USGS https://isotopes.usgs.gov/lab/referencematerials.html and check availability of these reference waters.

GFLES-4; d2H +399.8 ‰

UC04; d18O +38.95 ‰

As a lower end scale anchor you could use USGS48 for both d2H (-2.0 ‰) and d18O (-2.224 ‰).

The above suggestion is based on the assumption that you are likely to run a lot samples which means you could run out of IAEA reference water in a short period of time. You could use IAEA-607 (d2H +802.4 ‰; d18O +99.02 ‰) and VSMOW2 of course. Sales of IEAE-607 are limited to 4 units per lab per year. However, unless there was a change, sales of VSMOW2 are limited to 1 unit per lab per 3 years.


Best,

Wolfram



From: Stable Isotope Geochemistry [mailto:[log in to unmask]] On Behalf Of Christian Dietz
Sent: 24 February 2017 06:01
To: [log in to unmask]
Subject: [ISOGEOCHEM] DLW method

dear all,

I would like to know with which levels of D and d18O I would have to count in urine after administrating up to to 0.28g/kg 18O and 0.15g/kg 2H.

Or less specifically, those found in experiments to determine Total Body Water and Total Energy Expenditure.

It's for achieving IAEA standards covering the range I may have to expect.

thx, as always
Chris
--
Please consider the environment before printing this e-mail


 [http://careforafrica.org.au/wp-content/uploads/2013/08/utas-logo.png]


University of Tasmania │CSL - Isotope Ratio Mass Spectrometry

Dr. Christian Dietz, Facility Manager │Private Bag 74, Hobart, 7005 Tasmania


 • Tel: (+61) 3 6226 7820, cell phone: (+61) 4 9780 8570 │URL: Central Science Laboratory<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.utas.edu.au_research_central-2Dscience-2Dlaboratory&d=DQMFaQ&c=euGZstcaTDllvimEN8b7jXrwqOf-v5A_CdpgnVfiiMM&r=mlRDJltM2svd6oAfq2MrwoAbV6hyAe0dizt9C3HcIFY&m=dN45KSCAXm9yllNe7VjNVG2RRsJXwPYMEtNhuHuSZAY&s=maRQ2azd62YMuLSEZ3ELyK0EKc2B6wMg-NAI49g8diU&e=>


This message is intended exclusively for its adressee and may contain information that is CONFIDENTIAL and protected by professional privilege. If you are not the intended recipient you are hereby notified that any dissemination, copy or disclosure of this communication is strictly prohibited by law. If this message has been received in error, please immediately notify us via e-mail and delete.




________________________________

This email has been scanned for spam and viruses by Proofpoint Essentials. Click here<https://eu1.proofpointessentials.com/index01.php?mod_id=11&mod_option=logitem&mail_id=1487916180-aPQrdZndGhzd&r_address=w.meier-augenstein%40rgu.ac.uk&report=1> to report this email as spam.


________________________________

Robert Gordon University is the top university for graduate jobs in the UK HESA July 2015


Robert Gordon University, a Scottish charity registered under charity number SC 013781.

This e-mail and any attachment is for authorised use by the intended recipient(s) only. It may contain proprietary material, confidential information and/or be subject to legal privilege. It should not be copied, disclosed to, retained or used by, any other party. If you are not an intended recipient then please promptly delete this e-mail and any attachment and all copies and inform the sender. Please note that any views or opinions presented in this email are solely those of the author and do not necessarily represent those of Robert Gordon University. Thank you.