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Halogen anion formation by polybrominated compounds in negative chemical ionization mass spectrometry
Author(s) -
Greaves John,
Bekesi J. George,
Roboz John
Publication year - 1982
Publication title -
biomedical mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 0306-042X
DOI - 10.1002/bms.1200090908
Subject(s) - bromine , chemistry , halogen , ion , polybrominated biphenyls , mass spectrometry , polybrominated diphenyl ethers , electron ionization , molecule , ionization , electron capture , photochemistry , inorganic chemistry , organic chemistry , chromatography , pollutant , alkyl
Bromine anions from polybrominated biphenyls and bromobenzenes form in great abundance by dissociative electron capture. Nitrogen reagent gas moderates bromine expulsion more than does methane. The relationship between bromine anion to molecular anion ratio and the number of bromine atoms in the molecule is logarithmic. Asymmetric arrangement of bromine atoms favors decreased bromine anion formation. Increased source temperature favors dissociative electron capture, but also decreases sensitivity. The apparent composition of polybrominated biphenyl mixtures is strongly influenced by the range of masses scanned if bromine anions are excluded.