The hydroxyl-H from ethanol will exchange but the hydroxyl-O shouldn't. In
organic reactions, ethanol conserves the oxygen since it reacts as
ethanolate (C2H5O-), e.g. an ester made from ethanol and an organic acid
(say, acetic acid) will contain the ethanol-O as ester bond (which is why
one uses acetyl chloride or acetanhydride in acetylation reactions).
 
 
Wolfram
 

-----Original Message-----
From: Stable Isotope Geochemistry [mailto:[log in to unmask]] On Behalf
Of peter kroopnick
Sent: 23 October 2005 20:01
To: [log in to unmask]
Subject: Re: Delta 18O of Formalin or Ethanol


Dosn't the OH group exchange with water?  If so, the O18 would be dependent
upon the composition of the water.


At 09:24 AM 10/21/2005 +0200, you wrote:


Dear Andrea,
my lab measured 3 sample of ethanol in the framework of an interlaboratory
collaborative study among 11 labs in the world.
The 18O values and sample description are as follows:

15.7 0 Vs. V-SMOW - alcohol 95%
-1.4 0 Vs. V-SMOW- anhydrous synthetic alcohol
19.6 0 Vs. V-SMOW - anhydrous alcohol

Hoping this could help you.
Giorgio

[log in to unmask] wrote:



Hello, 



I was wondering if anyone has attempted to determine the delta 18O signature
of

10% formalin or 85% ethanol. If so, what values did you obtain?



Thank-you, 



Andrea



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