Dear list members!

We plan to take gas samples in order to analyse d13C of respiration in a
rather remote area next summer. Storage of samples up to 2 months will be
necessary. From our own experience, we know that air samples in excetainer
tubes are leaking quite a lot. Are there some possibilities, ways, tricks,
to store gas samples for 13C analysis for a longer time period? 

We are happy about any recommendations!!

Thanks

Christina Biasi