Journal
RAPID COMMUNICATIONS IN MASS SPECTROMETRY
Volume 20, Issue 14, Pages 2133-2142Publisher
WILEY
DOI: 10.1002/rcm.2557
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Atmospheric pressure photoionization (APPI) was assessed for the mass spectrometric analysis of polybromodiphenyl ethers (PBDEs) on the basis of a set of 17 standard compounds. Positive and negative ionization modes were both investigated. M+. ions were formed under positive ion conditions whereas the negative ion mode yielded [M-Br+O](-) ions. The behavior of these APPI-produced ions towards collisional activation was studied using an ion trap mass spectrometer. In positive ion mode, the loss of Br-2 was one of the major fragmentation pathways, and was favored for ortho-substituted PBDEs. Conversely, the loss of COBr. occurred only for non-ortho-substituted congeners. The collisional excitation of [M-Br+O](-) ions in the ion trap also led to the loss of Br-2, to the elimination of HBr, and to the formation of product ions by cleavage of the ether bond. The formation of para-quinone radical anions was observed for PBDEs ranging from penta- to hepta-congeners, whereas brominated aromatic carbanions were formed preferentially for the most brominated PBDEs studied in this work (hepta- or deca-BDEs). M+. ions did not undergo this fragmentation process. Copyright (c) 2006 John Wiley & Sons, Ltd.
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