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《Pesticide Science and Administration》 2018-11
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The Research on Residues and Decline of Fosthiazate in Cucumber and Soil

Wei Yunxia;Jiang Zhenfeng;Liu Zhaoqing;Liu Chunlai;Xiao Yi;Li Suping;Xiong Xingming;Liu Yiping;Center for Supervision,Inspeciton and Testing for Quality and Safety of Agricultural Products,Agricultural bureau of Liling City;Hunan Provincial Institute for the Control of Agrochemicals;College of Plant Protection, Hunan Agricultural University;  
The decline and final residues of fosthiazate in cucumber and soil samples in supervised field trials were determined by gas chromatography equipped with flame photometric detector(GCFPD). Cucumber and soil samples were extracted with acetonitrile,metered volume by ethyl acetate and determined by GC-FPD. Under the fortified level from 0. 01 to 0. 5mg/kg for cucumber and soil,the recovery ranged from 82. 0% to 107. 8% with the relative standard deviations of 5. 6% ~12. 3%. The mimimum detectable amount was 1. 0 × 10-14 g, and the limit of quantification(LOQ) of the method was 0. 01mg/kg for cucumber and soil samples. The decline test results showed that the rules consistent with first order kinetics equation,and the half-life of fosthiazate was 2. 17 ~ 3. 81 days in cucumber and 5. 37 ~ 9. 76 days in soil,respectively. The final residues results indicated that terminal residues in cucumber were less 0. 066mg/kg,below the MRL of China(0. 2mg/kg). Recommended dosage of 1 500 g. a. i/ha for 5% fosthiazate SL was suggested to apply in cucumber field with one time which is safe for cucumber.
【Fund】: 化学肥料和农药减施增效综合技术研发专项(2016YFD0201200);; 湖南省自然科学基金青年基金项目(2017JJ3165);; 湖南省研究生科研创新项目(CX2017B351)
【CateGory Index】: S481.8
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