Determination of CH4, CO2 and N2O in air samples and soil atmosphere by gas chromatography mass spectrometry, GC-MS

Journal of Environmental Monitoring : JEM
Dag EkebergTorild Wickstrom

Abstract

A method for determination of the climate gases CH4, CO2 and N2O in air samples and soil atmosphere was developed using GC-MS. The method uses straightforward gas chromatography (separation of the gases) with a mass spectrometric detector in single ion mode (specific determination). The gases were determined with high sensitivity and high sample throughput (18 samples h(-1)). The LOD (3sigma) for the gases were 0.10 micro L L(-1) for CH4, 20 microL L(-1) for CO2 and 0.02 microL L(-1) for N2O. The linear range (R2 = 0.999) was up to 500 microL L(-1) for CH4, 4000 microL L(-1) for CO2 and 80 microL L(-1) for N2O. The samples were collected in 10 mL vials and a 5 microL aliquot was injected on column. The method was tested against certified gas references, the analytical data gave an accuracy within +/-5% and a precision of +/-3%. The presence of < or = 10% by volume of C2H2 (often used experimentally to prevent N2 formation from N2O) did not interfere with detection for the targeted trace gases.

Citations

Oct 18, 2014·Environmental Science. Processes & Impacts·Takahiro AnanMichisato Toyoda
Oct 26, 2010·Journal of Microbiological Methods·Kazuo IsobeYuichi Suwa
Dec 10, 2013·Chemistry : a European Journal·Estela ClimentM Dolores Marcos
Jul 30, 2020·Journal of Environmental Management·Michalis OmirouIoannis M Ioannides

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