Dear all,
following up the Email of Peter Sauer who mentioned that there are a 
range of methane 13C standards available at Indiana University, USA, I 
would like to ask you all if there are also such standards available at 
a laboratory in Europe or Germany. I am currently trying to obtain a 
methane standard depleted in 13C (something about -100 to -70 permil) to 
recalibrate our laser based 13CH4 analyzers. I would be happy for any 
suggestions or help.

Best wishes
Klaus

-- 
Dr. Klaus-Holger Knorr
Dipl. Geoecology Univ.

Institute for Landscape Ecology
Ecohydrology and Biogeochemistry Group
Heisenbergstr. 2
University of Münster
48149 Münster
Germany

Mail: [log in to unmask]
Phone: +49-251-83-30207