质谱法
化学
气相色谱法
微量气体
分析化学(期刊)
大气(单位)
检出限
环境化学
色谱法
物理
有机化学
热力学
作者
Dag Ekeberg,Gunnar Ogner,Monica Fongen,Erik J. Joner,Torild Wickstrøm
出处
期刊:Journal of Environmental Monitoring
[The Royal Society of Chemistry]
日期:2004-01-01
卷期号:6 (7): 621-623
被引量:29
摘要
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.
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