Hello Priya,
A gas bench interfaced with a precon (pre-condenser) will combust methane to CO2.

Date: Thu, 28 Mar 2013 22:26:13 +0000
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Subject: [ISOGEOCHEM] Stable isotopes as tracers
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I am trying to look into possibilities of using stable isotopes as tracers. I am a microbial ecologist, working with sediment samples with very low microbial activity. I am particularly interested in
  stable isotopes such as NaH13CO3, H13COOH as substrates to track methanogensis and other respiratory processes in
 deep environments.

I am writing to find out about analytical instrumentation for this type of analysis. These are spiked samples and not natural abundances and can't be run in most labs with a IR-MS. 

1. Are there any labs that will be willing to work with us and help us run these samples?

2. I was told that if labelled methane can be combusted to CO2 independently of the GCC, it is possible to run it in-house. 

Obviously I am a novice at this and it would be great if I can be pointed in the right direction. I did try to search the message archives, either I am not putting in the right key words or that this question is probably
 too elemental!! 

Thanks for your help,

Priya Narasingarao, Ph.D
Marine Biology Research Division 
Scripps Institution of Oceanography
University of California, San Diego
La Jolla, CA 92037