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Dear Wolfram

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.

Best wishes
Andrew



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.
> 
> 
> Best,
> 
> Wolfram
> 
> 
> 
> ******************************************************
> 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
> Aberdeen
> 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!
> Andrew
> 
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