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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