期刊
CHEMOSPHERE
卷 226, 期 -, 页码 858-864出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2019.03.120
关键词
Organophosphorus pesticides; Manganese dioxide; Bisulfite; Abiotic degradation; Transformation pathway
资金
- National Natural Science Foundation of China [41772251, 41702267, 41521001]
- 111 Program (State Administration of Foreign Experts Affairs & the Ministry of Education of China) [B18049]
Organophosphorus pesticides (OPPs), a kind of effective insecticide, have attracted extensive attention of researchers because of the high toxicity and refractory character of their degradation products. Given the ubiquity of manganese dioxide (MnO2) and bisulfite (HSO3-) in environmental media, the abiotic degradation of several typical OPPs by the MnO2-HSO3- reaction system was investigated in batch experiments. As a representative OPP, methyl parathion (MP) was chosen to be the focus of the study. The removal rate of MP was remarkably improved by adding bisulfite (HSO3-) to the MnO2 single-reaction system, and the oxidation product methyl paraoxon was below the detection limit. The primary active substances generated from the reaction system were determined to be Mn(III) species by adding excess radical scavengers or complexants (methanol and pyrophosphate) to the reaction system. On the basis of the metabolic products of MP identified by liquid chromatography-high-resolution mass spectrometry (LC/HAMS) and gas chromatography-mass spectrometry (GC/MS), the transformation pathway of MP in the MnO2-HSO3- reaction system was elicited, which included the predominant processes of hydrolysis and oxidation. Furthermore, the typical OPPs with different structures were also degraded efficiently by the reaction system because of the oxidative degradation of Mn(III). This study offers significative information related to the abiotic oxidation of manganese minerals and the fate and dissipation of OPPs in the actual environment. (C) 2019 Elsevier Ltd. All rights reserved.
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