期刊
JOURNAL OF MASS SPECTROMETRY
卷 52, 期 2, 页码 69-77出版社
WILEY
DOI: 10.1002/jms.3903
关键词
sludge; triarylimidazoles; post-run screening; liquid chromatography time-of-flight mass spectrometry
资金
- Spanish Government
- Xunta de Galicia
- E.U. FEDER [CTQ2015-68660-P, GRC2013-020]
The identification and further quantification of 2-chloro-triarylimidazole (o-Cl-TAI) and its dimer (o-DCl-HABI) in sludge from a sewage treatment plant (STP) is reported for the first time. Liquid chromatography (LC) quadrupole time-of-flight (QTOF) mass spectrometry (MS) was used as analytical technique during screening and determination steps. Pollutants were identified following a post-run search strategy, applying the chlorine mass filter, and characterized by their accurate MS and product ion scan spectra. Finally, their identities were confirmed with authentic standards. The species (o-Cl-TAI) has been rated as potentially genotoxic and carcinogenic for mice and rats. Effects of sample preparation in the stability and the extraction efficiency of both compounds are discussed. Under final conditions, they were extracted from freeze-dried samples (0.5 g of sludge or biosolids dispersed with 2 g of C-18 and packed into a polypropylene syringe) with 20 ml of methanol, which also flowed through a clean-up layer of Florisil and PSA sorbents (0.5 g each). This method attained quantitative extraction yields and limits of quantification between 4 and 10 ng/g. The pollutants o-Cl-TAI and o-DCl-HABI were ubiquitous in sludge and biosolids obtained in consecutive years from the investigated STP. Their concentrations varied from 0.02 to more than 13 mu g/g (freeze-dried sample). Copyright (C) 2016 John Wiley & Sons, Ltd.
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