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Dechlorination of polychlorinated biphenyls in electron-capture negative-ion chemical ionization mass spectrometry

✍ Scribed by Francois L. Lépine; Sylvain M. Milot; Mark L. J. Reimer; Orval A. Mamer

Publisher
John Wiley and Sons
Year
1994
Tongue
English
Weight
753 KB
Volume
29
Category
Article
ISSN
1076-5174

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✦ Synopsis

Abstract

The electron‐capture negative‐ion chemical Ionization mass spectra of 36 ^35^Cl mono‐ and di‐labelled penta‐ and hexachlorobiphenyls were studied. Under the conditions of the analyses, the dechlorination of these congeners probably proceeds through electrophilic hydrogen atom attachment followed by rapid loss of the chlorine atom at the same position. These dechlorination reactions occur regioselectively. When present, ortho‐chlorines are lost preferentially to meta‐ and para‐chlorines. The extent of the dechlorination reaction, as seen by the relative abundance of the [MH  Cl]^−^ ions, decreases with increasing number of ortho‐chlorines.

📜 SIMILAR VOLUMES

Dechlorination of polychlorinated biphen
Dechlorination of polychlorinated biphenyls in electron impact mass spectrometry: Regioselective analysis using 35Ci-labelled compounds
✍ François L. Lépine; Sylvain M. Milot; Mark L. J. Reimer; Orval A. Mamer 📂 Article 📅 1992 🏛 John Wiley and Sons 🌐 English ⚖ 441 KB

## 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 compar