Thanks so much for the quick reply. Happy to share in case someone else
has this question in the future.
The sample was leaf litter - sorry didn't want to bog down in specifics.
The d2H values of the 2 waters were -196.1 and 14.5. And the total 2H
values were -177.87 and -177.77, respectively.
On 2018-12-19 19:55, Wolfram Meier-Augenstein (pals) wrote:
> Dear Andrew,
> To help you with your question one would need to know a few more
> specifics such as chemical nature of the organic solid and d2H values
> of the 2 waters A and B used for the exchange experiment for starters.
> You are welcome to contact me off-line if you feel you cannot share
> the specifics of your experiment with the list.
> Prof. Dr W Meier-Augenstein, CChem, FRSC
> Stable Isotope Forensics & Analytical Sciences
> Robert Gordon University
> School of Pharmacy and Life Sciences
> The Ian Wood Building
> Garthdee Road
> AB10 7GJ
> E-mail: [log in to unmask]
> From: Stable Isotope Geochemistry <[log in to unmask]> on behalf
> of A.J. Tanentzap <[log in to unmask]>
> Sent: 19 December 2018 19:35:02
> To: [log in to unmask]
> Subject: [ISOGEOCHEM] help interpreting 2H exchange exp't
> Dear all
> I've run an exchange experiment on a solid organic as described in
> Meier-Augenstein et al. 2011. Rapid Commun Mass Spectrom.
> I estimated the non-exchangeable 2H ratio to be -178. The estimated
> fraction of exchangeable H in the sample was 0.0005.
> When I re-run the sample in a bulk analysis, the total (i.e.
> exchangeable + non-exchangeable) ratio was -190.
> Would someone be so kind as to explain how this is possible with a
> near-zero fraction of exchangeable H?
> Many thanks!
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