Chiral fungicide triadimefon and triadimenol: Stereoselective transformation in greenhouse crops and soil, and toxicity to Daphnia magna

文献类型： 外文期刊

第一作者： Dong, Fengshou

作者： Dong, Fengshou;Liu, Xingang;Xu, Jun;Han, Yongtao;Zheng, Yongquan

作者机构：

关键词： Triadimefon;Triadimenol;Stereoselectivity;Degradation;Aquatic toxicity

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：10.588； 五年影响因子：10.129 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Various chiral pesticides are used in greenhouses to ensure high crop yields. However, detailed knowledge on the environmental behavior of such chiral contaminants with respect to enantioselectivity in the greenhouse has received little attention so far. Here, the widely used fungicide triadimefon was chosen as a "chiral probe" to investigate its enantioselective degradation and formation of triadimenol in greenhouse tomato, cucumber, and soil under different application modes. In addition, the stereos-electivity of individual isomers of triadimefon and triadimenol in aquatic toxicity were first studied. Significant differences in their acute toxicity to Daphnia magna were observed among the isomers. Under foliage application or soil irrigation application, S-(+)-triadimefon was preferentially degraded, resulting in relative enrichment of the more toxic R-(-)-enantiomer in tomato, cucumber, and soil. Further enantioselective analysis of converted triadimenol showed that the compositions of the four product stereoisomers were different and closely dependent on environmental conditions: the most toxic RS-(+)-triadimenol was the most preferentially produced isomer in tomato under foliage treatment, while the RR-(+)-triadimenol was proved to be the highest amount of metabolite isomer in cucumber and soil under both treatment modes and in tomato under soil treatment.

分类号： TB1

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