Compound-specific 81Br/79Br analysis by capillary gas chromatography/multicollector inductively coupled plasma mass spectrometry.
作者： Sean P. Sylva , Lary Ball , Robert K. Nelson , Christopher M. Reddy
DOI: 10.1002/RCM.3211
关键词: Isotope 、 Chemistry 、 Inductively coupled plasma mass spectrometry 、 Bromine 、 Atmospheric chemistry 、 Solvent 、 Gas chromatography 、 Hydrogen 、 Analytical chemistry 、 Mass spectrometry
摘要: Brominated organic compounds (BOCs) are of great interest in atmospheric chemistry, natural products, geochemistry, and marine chemistry. The Br isotope ratios ((81)Br (79)Br; average (81)Br/(79)Br = 0.97277) have significant potential for the study source, transport, fate these compounds. Currently, there is no published method determining isotopic content BOCs complex mixtures. To measure stable on a compound-specific basis, we assembled gas chromatography/multicollector inductively coupled plasma mass spectrometry (GC/MCICPMS) system. Background signals, formation Ar dimers from hydrogen, solvent peak did not affect results. analysis three brominated benzenes revealed that 0.3 per thousand precision can be attained when nmol injected. For samples larger than Br, was within factor 3 shot-noise limit, which best possible statistical attainable avoiding all other sources noise.
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