Stereoselective environmental fate of fosthiazate in soil and water-sediment microcosms

被引:16
|
作者
Li, Lianshan [1 ]
Sun, Xiaofang [1 ]
Lv, Bo [2 ]
Xu, Jiangyan [2 ]
Zhang, Jing [1 ]
Gao, Yingying [1 ]
Gao, Beibei [1 ]
Shi, Haiyan [1 ]
Wang, Minghua [1 ]
机构
[1] Nanjing Agr Univ, Coll Plant Protect, State & Local Joint Engn Res Ctr Green Pesticide, Dept Pesticide Sci, Nanjing 210095, Peoples R China
[2] Nanjing Agr Univ, Coll Sci, Dept Chem, Nanjing 210095, Peoples R China
关键词
Fosthiazate; Chirality; Mass spectrometry; Environmental implications; Degradation pathway;
D O I
10.1016/j.envres.2020.110696
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The stereoselective fates of chiral pesticides in the environment has been reported in many studies. However, there is little data focused on the fate of chiral fosthiazate in the soil and aquatic ecosystems at chiral view. This study investigated the stereoselective fate of fosthiazate in the soil and aquatic ecosystems using ultra performance liquid chromatography tandem mass spectrometry (UPLC-MS/MS) and liquid chromatography tandem time-of-flight mass spectrometry (LC-TOF/MS/MS). Significant stereoselective degradation among four fosthiazate stereoisomers were found in both greenhouse soil and water-sediment microcosms. In greenhouse soil, (1R,3S)-fosthiazate degraded faster than other three stereoisomers with the half-life of 2.7 d. The fosthiazate stereisomers in the seawater-sediment microcosm degraded more rapidly than in the river water-sediment microcosm. However, (1S,3R)-fosthiazate and (1S,3S)-fosthiazate possessed shorter degradation half-lives than their enantiomers in both microcosms, with the half-lives ranging from 3.4 d to 15.8 d. Ten degradation products were identified in the water-sediment microcosms, and, six of them were reported for the first time. Oxidation and hydrolysis were confirmed as the main degradation pathways of fosthiazate in the water-sediment microcosms. Our results revealed that the (1R,3S)-fosthiazate and (1R,3R)-fosthiazate may cause more serious ecotoxicity due to the longer half-lives than the other two stereoisomers in environment.
引用
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页数:8
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