Greetings:

  We are calibrating our new TC/EA for measuring d18O of solid  
samples. Having measured VSMOW and SLAP waters, we have calculated  
the  "source stretching" factor Y worked out by Coplen (1988) to  
normalize the d18O isotope data to the VSMOW and SLAP scales.   
Coplen, (1988) also worked out the systematics for a variety of other  
samples (e.g., sulphates, organic material, etc.) based upon a CO2- 
H2O fractionation factor, of value 1.0412. Having not done my  
homework, I assume this CO2-H2O fractionation factor is not  
applicable to CO-H2O reactions on the TC/EA? Is there a CO-H2O  
fractionation factor applicable here? References?

Help and guidance is appreciated!

Cheers,
Dyke

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Dyke Andreasen
University of California - Santa Cruz
Earth and Planetary Sciences
1156 High Street, C512
Santa Cruz, CA  95064
(831)-459-5857
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