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| Residue analysis and degradation dynamics of chlorantraniliprole in soybean and soil |
| Received:November 06, 2015 |
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| KeyWord:chlorantraniliprole;soybean;degradation dynamics;residue |
| Author Name | Affiliation | | CHEN Guo-feng | College of Agriculture, Northeast Agricultural University, Harbin 150030, China
Safety and Quality Institute of Agricultural Products, Heilongjiang Acadamy of Agricultural Sciences, The Ministry of agriculture of agricultural products quality safety risk assessment Laboratory(Harbin), Harbin 150086, China | | LIU Feng | Safety and Quality Institute of Agricultural Products, Heilongjiang Acadamy of Agricultural Sciences, The Ministry of agriculture of agricultural products quality safety risk assessment Laboratory(Harbin), Harbin 150086, China | | ZHANG Xiao-bo | Safety and Quality Institute of Agricultural Products, Heilongjiang Acadamy of Agricultural Sciences, The Ministry of agriculture of agricultural products quality safety risk assessment Laboratory(Harbin), Harbin 150086, China | | LIAO Hui | Safety and Quality Institute of Agricultural Products, Heilongjiang Acadamy of Agricultural Sciences, The Ministry of agriculture of agricultural products quality safety risk assessment Laboratory(Harbin), Harbin 150086, China | | TAO Bo | College of Agriculture, Northeast Agricultural University, Harbin 150030, China |
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| Abstract: |
| In this paper, an analytical method was established for determining chlorantraniliprole in vegetable soybean, soybean plant and soil. Residue and degradation dynamics of chlorantraniliprole were examined after its applications to soybean field. Chlorantraniliprole in vegetable soybean, soybean plant and soil samples was extracted by acetonitrile/water, cleaned by SPE-NH2, and determined by LC-MS/MS. The average recoveries ranged from 99.8% to 107.6%, with relative standard deviations of 1.7%~7.2% in vegetable soybean, soybean plant and soil. The minimum detectable concentrations of chlorantraniliprole in vegetable soybean, soybean plant and soil were 0.05 mg·kg-1. The minimum detectable limit of chlorantraniliprole was 2.5×10-10 g. The degradation of chlorantraniliprole in Harbin, Shijiazhuang and Chuxiong was all fitted the first-order reaction equation. The half-lives of chlorantraniliprole degradation were estimated at 4.3 d to 10.1 d in soybean plant, and 3.1 d to 10.2 d in soil. When chlorantraniliprole was sprayed at a dose of 195.7 g·hm-2 and 293.6 g·hm-2 twice or three times at a 7 day interval, its maximum residual concentration was 0.923 mg·kg-1 and 0.757 mg·kg-1 respectively, in green soybean and soil on the 3rd day after the last application, which was below the MRL for chlorantraniliprole in vegetable soybean(1.0 mg·kg-1) set forth by Japan and Australia. These results suggest that 200 g·L-1 chlorantraniliprole SC could be used in soybean field up to 3 times with pre-harvest interval of 3 days. |
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