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

Fuchs, Andreas; Schwander, Jakob; Stauffer, Bernhard (1993). 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. Journal of glaciology, 39(131), pp. 199-203. International Glaciological Society 10.3189/S0022143000015835

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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.

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