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On‐site measurement of atmospheric tracer gases
Author(s) -
Elias L.,
McCooeye M.,
Gardner G.
Publication year - 1976
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl003i001p00017
Subject(s) - tracer , vapours , environmental science , atmosphere (unit) , sampling (signal processing) , volume (thermodynamics) , detection limit , contamination , adsorption , analytical chemistry (journal) , materials science , environmental chemistry , chemistry , chromatography , meteorology , optics , physics , nuclear physics , organic chemistry , quantum mechanics , neuroscience , detector , biology , ecology
In‐situ GC analysis of SF 6 and halofluorocarbons in the atmosphere was achieved by sampling a measured volume of ambient air through a short adsorption tube, or precolumn, from which the collected vapours were released by heating and then transferred directly by the carrier stream to the analytical column. The collection, transfer and analysis operations were performed in the one instrument with the aid of gas sampling valves, thereby minimizing the risk of loss or contamination associated with other sample storage and removal procedures. Field trials using CBr 2 F 2 and SF 6 as tracers have demonstrated the efficacy of the technique for the quantitative measurement of such gases in the atmosphere. The detection limit attained in this work is estimated to be about 5 × 10 −14 v/v.