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Fri, 24 Feb 2017 09:30:14 +0000
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Stable Isotope Geochemistry <[log in to unmask]>
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"Wolfram Meier-Augenstein (pals)" <[log in to unmask]>
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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
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