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Date: | Thu, 9 Nov 2006 10:44:14 -0700 |
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Jaime,
We have been collecting waters from insects using an extraction line and did
notice a significant effect on H and O isotope ratios from the volatile
organics. We found that even a small amount of activated charcoal into the
collection tube you can completely remove the VOCs from the extracted water
and there is no fractionation associated with the charcoal. I'll send you
some data off the list to demonstrate this. Presumably the situation will be
similar with plant materials.
Anthony
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Anthony L. Michaud
W. M. Keck Foundation Laboratory for Environmental Biogeochemistry
School of Earth and Space Exploration
Arizona State University
Tempe, AZ 85287-1404
Web: http://kfleb.asu.edu
Tel: 480-727-8033
Fax: 480-965-8102
Mailing address:
Anthony Michaud
PSF-686
Arizona State University
Tempe, AZ 85287-1404
***Windsurf Everywhere***
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-----Original Message-----
From: Stable Isotope Geochemistry [mailto:[log in to unmask]] On Behalf
Of Jaime
Sent: Thursday, November 09, 2006 9:58 AM
To: [log in to unmask]
Subject: [ISOGEOCHEM] H-isotope Question
I am currently conducting experiments analyzing H-isotopes in water from
various plant materials. The water I have collected from the conifers
is cloudy, so I am guessing that I also co-collected some small organic
compounds. My method for analysis is pyrolysis at a high temperature
(1200-1400 degrees C). I do not know how much of an effect the
H-contribution from these compounds will be isotopically. I have enough
volume to split the samples, and am thinking about adding activated
charcoal to half the sample and then filtering it before running (after
West et al. 2006). I am concerned about the potential for fractionation
during this procedure. Has anyone else run into this problem, or have
other suggestions? Thank you in advance.
Best,
Jaime L Toney
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