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GeoVOC: A SIFT-MS method for the analysis of small linear hydrocarbons of relevance to oil exploration

2007; Elsevier BV; Volume: 268; Issue: 1 Linguagem: Inglês

10.1016/j.ijms.2007.08.005

1873-2798

Gregory J. Francis, Paul F. Wilson, Daniel B. Milligan, Vaughan S. Langford, Murray J. McEwan,

Analytical Chemistry and Chromatography

The rate coefficients of the ion–molecule reactions between O2+, H3O+, and a range of linear saturated hydrocarbons, and between common hydrocarbon product ions from these reactions and water were determined using a flowing afterglow selected ion flow tube mass spectrometer. Using these data, the selected ion flow tube-mass spectrometry (SIFT-MS) technique was applied to the real-time measurement of linear saturated hydrocarbons in dry and moist headspace samples without sample preparation. Using a Voice100 SIFT-MS instrument the Geochemical VOC method (GeoVOC) has been assessed against calibrated standards and found to give an experimental RMS precision to within 2% for dry and 6% for humid hydrocarbon samples in the ppm range. The application of SIFT-MS and development of the GeoVOC method offers a fast convenient means of assessment of hydrocarbon seeps.