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Concentration and dissipation of chlorantraniliprole and thiamethoxam residues in maize straw, maize, and soil

文献类型： 外文期刊

作者： He, Min 2 ; Song, Dan 3 ; Jia, Hong C. 2 ; Zheng, Yongquan 1 ;

作者机构： 1.Chinese Acad Agr Sci, Inst Plant Protect, Beijing, Peoples R China

2.Beijing Acad Agr & Forestry Sci, Inst Plant & Environm Protect, Beijing, Peoples R China

3.Yangtze Univ, Coll Agr, Jingzhou, Peoples R China

关键词： Dissipation kinetics;maize;pesticide residue;pre-harvest interval;UPLC-MS;MS

期刊名称：JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART B-PESTICIDES FOOD CONTAMINANTS AND AGRICULTURAL WASTES （ 影响因子：1.99； 五年影响因子：2.116 ）

ISSN：

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收录情况： SCI

摘要： To study the dissipation rates and final residual levels of chlorantraniliprole and thiamethoxam in maize straw, maize, and soil, two independent field trials were conducted during the 2014 cropping season in Beijing and Anhui Provinces of China. A 40% wettable powder (20% chlorantraniliprole+20% thiamethoxam) was sprayed onto maize straw and soil at an application rate of 118g of active ingredient per hectare (g a.i.ha(-1)). The residual concentrations were determined by ultra-high-performance liquid chromatography-tandem mass spectrometry. The chlorantraniliprole half-lives in maize straw and soil were 9.0-10.8 and 9.5-21.7days, respectively. The thiamethoxam half-lives in maize straw and soil were 8.4-9.8 and 4.3-11.7days, respectively. The final residues of chlorantraniliprole and thiamethoxam in maize straw, maize, and soil were measured after the pesticides had been sprayed two and three times with an interval of 7days using 1 and 1.5times the recommended rate (72g a.i. ha(-1) and 108g a.i. ha(-1), respectively). Representative maize straw, maize, and soil samples were collected after the last treatment at pre-harvest intervals of 7, 14, and 28days. The chlorantraniliprole residue was below 0.01mg kg(-1) in maize, between 0.01 and 0.31mg kg(-1) in maize straw, and between 0.03 and 1.91mg kg(-1) in soil. The thiamethoxam residue concentrations in maize, maize straw, and soil were <0.01, <0.01, and 0.01-0.03mg kg(-1), respectively. The final pesticide residues on maize were lower than the maximum residue limit (MRL) of 0.02mg kg(-1) after a 14-day pre-harvest interval. Therefore, a dosage of 72g a.i. ha(-1) was recommended, as it can be considered safe to human beings and animals.

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