Hello Tanaka, please, contact also Guenther Schwarz: [log in to unmask] He is dealing with air moisture sampling for isotope variations in polar regions in the Japan Antarctic Expedition during summer/winter seasons. Among others he is using our old method of trapping air moisture on molecular sieve for deuterium analyses. To that method, my colleague Peter Kowski is very experienced: [log in to unmask] Regards, Gerhard Strauch ************************************ Gerhard Strauch Centre for Environmental Research Leipzig-Halle Ltd Department of Hydrogeology Hallesche Strasse 44 D-06246 Bad Lauchstaedt Germany Tel: ++49/34635/73218 Fax: ++49/34635/73287 e-mail: [log in to unmask]