title: Dissipation rates and final residues of kresoxim-methyl in strawberry and soil.
abstract: In order to study the dissipation rates and final residues of kresoxim-methyl in strawberry and soil, two independent filed trials were performed in Beijing China. The application rates are set at 195 g of active gradient per hectare. A simple analytical method has been developed for the determination of kresoxim-methyl in strawberry and soil. Kresoxim-methyl residues were extracted with acetonitrile from strawberry and soil samples which is determined by gas chromatography coupled with mass spectrometry detection (GC-MSD). The recoveries of kresoxim-methyl in strawberry and soil were observed from 78.9 % to 104.5 % at fortification levels of 0.01-0.5 mg/kg with relative standard deviations of 4.3 %-7.3 %. The reported limits of detection were 0.05 and 0.01 mg/kg for strawberry and soil, respectively. The results showed that kresoxim-methyl dissipation in strawberry could be described as first-order equation with the half-life time of 6.24 and 6.91 days. 14 days later, the dissipation rate is 84.9 % and 83.3 %, respectively. The final residues of kresoxim-methly in the strawberry were in the range of 2.7-4.8 mg/kg at pre-harvest intervals of 1, 3, 5, 7 days which is below the Japan maximum residue limits (MRLs) standards (5 mg/kg in strawberry).
authors.affiliation: Institute of Plant and Environment Protection, Beijing Academy of Agricultural and Forestry Sciences, Beijing, 100097, China.
authors.forename: Chunhong
authors.initials: C
authors.lastname: Jia
authors.forename: Xiaodan
authors.initials: X
authors.lastname: Zhu
authors.forename: Ercheng
authors.initials: E
authors.lastname: Zhao
authors.forename: Min
authors.initials: M
authors.lastname: He
authors.forename: Pingzhong
authors.initials: P
authors.lastname: Yu
authors.forename: Li
authors.initials: L
authors.lastname: Chen
mesh_terms: D031985:Fragaria / Q000378:metabolism*; D005659:Fungicides, Industrial / Q000493:pharmacokinetics*; D008401:Gas Chromatography-Mass Spectrometry; D006207:Half-Life; D057230:Limit of Detection; D008689:Methacrylates / Q000493:pharmacokinetics; D010648:Phenylacetates / Q000493:pharmacokinetics*; D015203:Reproducibility of Results; D012989:Soil Pollutants / Q000493:pharmacokinetics*; D000073739:Strobilurins
chemical_list: D005659:Fungicides, Industrial; D008689:Methacrylates; D010648:Phenylacetates; D012989:Soil Pollutants; D000073739:Strobilurins; C469328:kresoxim-methyl