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• W1848037837 abstract "The herbicide bromacil has been extensively used in the Spanish Mediterranean region, and although plant protection products containing bromacil have been withdrawn by the European Union, this compound is still frequently detected in surface and ground water of this area. However, the fast and complete disappearance of this compound has been observed in water intended for human consumption, after it has been subjected to chlorination. There is a concern about the possible degradation products formed, since they might be present in drinking water and might be hazardous. In this work, the sensitive full‐spectrum acquisition, high resolution and exact mass capabilities of hybrid quadrupole time‐of‐flight (QTOF) mass spectrometry have allowed the discovery and proposal of structures of transformation products (TPs) of bromacil in water subjected to chlorination. Different ground water samples spiked at 0.5 µg/mL were subjected to the conventional chlorination procedure applied to drinking waters, sampling 2‐mL aliquots at different time intervals (1, 10 and 30 min). The corresponding non‐spiked water was used as control sample in each experiment. Afterwards, 50 μL of the water was directly injected into an ultra‐high‐pressure liquid chromatography (UHPLC)/electrospray ionization (ESI)‐(Q)TOF system. The QTOF instrument enabled the simultaneous recording of two acquisition functions at different collision energies (MS E approach): the low‐energy (LE) function, fixed at 4 eV, and the high‐energy (HE) function, with a collision energy ramp from 15 to 40 eV. This approach enables the simultaneous acquisition of both parent (deprotonated and protonated molecules) and fragment ions in a single injection. The low mass errors observed for the deprotonated and protonated molecules (detected in LE function) allowed the assignment of a highly probable molecular formula. Fragment ions and neutral losses were investigated in both LE and HE spectra to elucidate the structures of the TPs found. For those compounds that displayed poor fragmentation, product ion scan (MS/MS) experiments were also performed. On processing the data with specialized software (MetaboLynx), four bromacil TPs were detected and their structures were elucidated. To our knowledge, two of them had not previously been reported. Copyright © 2011 John Wiley & Sons, Ltd." @default.
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• W1848037837 date "2011-09-15" @default.
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• W1848037837 title "Use of quadrupole time-of-flight mass spectrometry to determine proposed structures of transformation products of the herbicide bromacil after water chlorination" @default.
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• W1848037837 doi "https://doi.org/10.1002/rcm.5183" @default.
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