Rapid Analysis of Climate Gases by Wide Bore Capillary Gas Chromatography
- Bishal K. Sitaula,
- Jiafa Luo and
- Lars R. Bakken *
A gas chromatographic method that gives sensitive and rapid (3.3 min) measurement of the three greenhouse gases CO2, CH4, N2O 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 (Cl04)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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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