Comparison of microprobe two-step laser desorption/laser ionization mass spectrometry and gas chromatography/ mass spectrometry studies of polycyclic aromatic hydrocarbons in ancient terrestrial rocks |
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| Authors: | Tania B Mahajan Fiona L Plows J Seb Gillette Richard N Zare Graham A Logan |
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| Institution: | (1) School of Geosciences, University of Sydney, Sydney, NSW, 2006, Australia;(2) Water and Environment Business Unit, Sinclair Knight Merz, 263, Adelaide Terrace, Perth, WA, 6000, Australia;(3) Australian Centre for Astrobiology, Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW, 2109, Australia;(4) Present address: School of Chemistry, University of Sydney, Sydney, NSW, 2006, Australia |
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| Abstract: | Microprobe two-step laser desorption/laser ionization mass spectrometry (μL2MS) and gas chromatography/mass spectrometry (GC/MS) were used to analyze polycyclic aromatic hydrocarbons (PAHs) in ancient terrestrial rocks. μL2MS provides an in situ analysis of very small samples, records the PAHs with no isomer information, and gives quantitative data on the degree of alkylation of a given PAH series over the complete mass range. GC/MS provides isomer separation and quantitation of PAHs in bitumen but not kerogen, and is limited by sample size. Combination of these techniques allows analysis of very small samples by μL2MS with GC/MS confirmation of isomer distributions of the solvent extractable components (bitumen). It was found that the concentration of bitumen within the rock samples affects the PAH alkylation signal for μL2MS. At low bitumen concentrations μL2MS can produce pyrolysis products from kerogen that is present; however, as bitumen concentrations increase, the PAH distribution from bitumen dominates the signal. |
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