Title: Residue Determination and Degradation of Thifluzamide in Potato and Soil
Abstract: A method for determination of the thifluzamide residue in the potato,potato plant and soil was established. The field residue decline study and final residue trials of thifluzamide in potato in Tianjin City and Nanjing City were designed. Samples were extracted with acetone,partitioned by methylene chloride,and then detected by gas chromatography(GC)with electron capture detector(ECD). The fortified recovery at level of 0.001 mg·kg-1 to 0.05 mg·kg-1 was ranged from 85.76% to 93.53%,with relative standard deviation of 1.44% to 7.33%. The limit of quantification was 0.001 mg·kg-1. The half-life of thifluzamide in potato plant and soil were 6.08~6.30 d and 4.92~7.07 d respectively,with over 91% degradation rate after 21 d pesticide application. When the recommended dosage(480 g·hm-2) and 1.5 times recommended dosages(720 g·hm-2)of 240 g·L-1 thifluzamide SC was sprayed once,the final residues of thifluzamide in potato and soil were between 0.076 2~0.649 6 mg·kg-1and 0.020 7~0.305 0 mg·kg-1,respectively at harvest time. According to the results of this study,the maximum residue limit of thifluzamide in the potato is 1.0 mg·kg-1。
Publication Year: 2013
Publication Date: 2013-01-01
Language: en
Type: article
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Cited By Count: 2
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