Dechlorination of polychlorinated biphenyls in electron impact mass spectrometry: Regioselective analysis using 35Ci-labelled compounds
✍ Scribed by François L. Lépine; Sylvain M. Milot; Mark L. J. Reimer; Orval A. Mamer
- Publisher
- John Wiley and Sons
- Year
- 1992
- Tongue
- English
- Weight
- 441 KB
- Volume
- 27
- Category
- Article
- ISSN
- 1076-5174
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✦ Synopsis
Abstract
Four tetrachlorinated bipbenyls were chlorinated with ^35^Cl~2~ to yield seventeen polychlorinated biphenyls (PCBs) substituted once or twice with chlorine enriched in ~35~Cl. Gas chromatographic analysis of the mixtures allowed the identification of the labelled PCBs produced by comparison of their relative retention times with published values. This also permitted the assignment of the position of the labels in these molecules. Mass spectrometric determination of the ^35^Cl/^35^Cl ratio of the ions corresponding to successive dechlorination of these PCBs in positive‐ion electron impact (EI) allowed quantification of the residual ^35^Cl label in these ions. Chlorines in the ortho position are lost preferentially to those in meta or para positions. The first dechlorination reaction was found to be totally regioselective for at least two PCB congeners.