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Rapid Analysis of Climate Gases by Wide Bore Capillary Gas Chromatography
Author(s) -
Sitaula Bishal K.,
Luo Jiafa,
Bakken Lars R.
Publication year - 1992
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq1992.00472425002100030030x
Subject(s) - peristaltic pump , chromatography , gas chromatography , chemistry , capillary action , analytical chemistry (journal) , flushing , materials science , physics , meteorology , composite material , medicine , endocrinology
A gas chromatographic method that gives sensitive and rapid (3.3 min) measurement of the three greenhouse gases CO 2 , CH 4 , N 2 O is described. A wide bore capillary column operated at optimal conditions gave sufficient separation to allow a switch of the column flow between two detector systems (TCD and FID in series, and ECD) during the chromatogram; thus, all three gases could be analyzed with a single sample injection. Application of a peristaltic pump allowed gas samples to be transfered directly from gas sampling vials, through a drying agent [Mg (Cl0 4 ) 2 ] and into the injection loop (0.5 mL) Back flushing of the injection system (pump and drying agent) with He between each injection ensured minimal carry over between samples (<0.6%). Experiences with storage of gas samples in vials with butyl rubber septa are described.