A new ice mill allows precise concentration determination of methane and most probably also other trace gases in the bubble air of very small ice samples

• Published in: Journal of Glaciology
• Main Authors: Fuchs, Andreas, Schwander, Jakob, Stauffer, Bernhard
• Format: Article in Journal/Newspaper
• Language: English
• Published: International Glaciological Society 1993
• Subjects: 530 Physics; Journal of Glaciology
• Online Access: https://boris.unibe.ch/158679/1/fuchs93jg.pdf; https://boris.unibe.ch/158679/

A new extraction system has been constructed and tested which allows the extraction of gases from air bubbles in ice without melting it. An ice sample of up to 20 g is crushed in a sealed container by a milling cutter and the gas escaping from the opened bubbles is flushed with helium to a Porapak column where it is stored until its injection into the gas Chromatograph. To avoid any contamination with CH4 produced by friction in the gear section, a helium-flushed rotary feed-through is used. CH4 analyses on ice samples of about 10 g from the last 1000 years give precise and reproducible results. In the future, it is planned to measure also the CO2 and N2O concentrations on the same sample.