Hi Katerina,

We have measured soil respiration using our typical method for CO2 in air or carbonates with no additional trapping. The main thing to consider is that the concentrations will be quite high. So you may need to dilute the samples and prepare standards to be comparable.

Best regards,


Benjamin Harlow
Manager, Stable Isotope Core Laboratory
Washington State University
367 Eastlick | Pullman, WA  99164-4236
Office: 509-335-6161 | Lab: 509-335-6154 | Fax:509-335-3184

-----Original Message-----
From: Stable Isotope Geochemistry [mailto:[log in to unmask]] On Behalf Of Katerina Jandova
Sent: Tuesday, February 07, 2017 2:32 PM
To: [log in to unmask]
Subject: [ISOGEOCHEM] soil respiration samples using GasBench

Hello everybody.
I'd like to measure 13C/12C in CO2 in samples of soil respiration. Can the samples be directly forwarded via the PoraPlot GC column of GasBench to open split and mass spec? Or are any components of the air (e.g. molecular oxygen) prohibited from entering the mass spec and need to be separated out using the LN (cold) trap?

Any advice would be most welcome.

Katerina Jandova, Ph.D.

​Institute for Environmental Studies
Faculty of Science, Charles University
Benatska 2, 128 01 Prague 2
Czech Republic