Chlorine isotope fractionation of a semi-volatile organochlorine compound during preparative megabore-column capillary gas chromatography

TitleChlorine isotope fractionation of a semi-volatile organochlorine compound during preparative megabore-column capillary gas chromatography
Publication TypeJournal Article
Year of Publication2006
AuthorsHolmstrand, H, Mandalakis M, Zencak Z, Gustafsson Ö, Andersson P
JournalJournal of Chromatography A
Volume1103
Issue1
Pages133 - 138
KeywordsChlorine isotope fractionation, Compound specific chlorine isotope analysis, DDT, Preparative gas chromatography, Thermal ionization mass spectrometry
Abstract

Chlorine isotope fractionation during preparative capillary gas chromatography (pcGC) was investigated using 1,1,1-trichloro-2,2-bis(p- chlorophenyl)ethane (DDT) as a model compound for semi-volatile organochlorine (OCl) molecules. Chlorine isotope analysis by thermal ionization mass spectrometry revealed no significant alteration of the chlorine isotope composition when the whole peaks were collected in pcGC (δ37Cl -3.2‰ versus -3.6‰ for the unprocessed DDT, ±0.5‰ SD). However, distinct isotope fractionations were measured for the front (δ37Cl -5.1‰) and tail (δ37Cl -1.8‰) segments of partially collected samples. Isolation of individual OCls by pcGC enables accurate off-line chlorine isotope analysis, and thus facilitates the investigation of naturally occurring OCls. © 2005 Elsevier B.V. All rights reserved.

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