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Paul,
Thanks for your response. Did you happen to publish any of these results? I
have searched everywhere, but can not find any reference for this
methodology as related to isotopic analysis.
Brian Jones
Assistant Research Scientist
& Lab Manager
Stable Isotope Ecology Laboratory
Dept. of Oceanography
Texas A&M University
College Station Tx. 77843
(979) 845-8916
_____
From: Stable Isotope Geochemistry [mailto:[log in to unmask]] On Behalf
Of Paul Eby
Sent: Thursday, March 24, 2005 11:12 AM
To: [log in to unmask]
Subject: Re: [ISOGEOCHEM] Pre-concentration and analysis of HC in Atmo
We've done a few studies along these lines. As long as the sorbent is strong
enough to hold on to the chosen analytes at room temperature (ie not an
equilibrium) and you are able to heat the sorbent enough to get the analyte
off again, then there should be no appreciable fractionation.
Much of this was done with custom built equipment, but really the important
factor is finding the right sorbent.
Paul Eby
University of Victoria
At 08:01 AM 24/03/2005, you wrote:
Hello All,
I was wondering if anyone out there has used the packed tubes to
pre-concentrate and a thermal desorption unit to measure carbon isotopes of
atmospheric hydrocarbons by GC-C-IRMS. If so, could you tell me the make of
the equipment used, if you found any isotopic fractionation from
pre-concentrating and/or desorption, and any references to published data
from the method.
Brian Jones
Assistant Research Scientist
& Lab Manager
Stable Isotope Ecology Laboratory
Dept. of Oceanography
Texas A&M University
College Station Tx. 77843
(979) 845-8916
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