Title: Residue Determination and Degradation of Sulfoxaflor in Cotton and Soil
Abstract: An analytical method with high performance liquid chromatography (HPLC) was established for determining sulfoxaflor residue in soil, cotton seeds and cotton leaves. The field residue decline study and final residue trials of sulfoxaflor in cotton in Tianjin City and Hangzhou City, were designed. The samples were extracted with acetonitrile, partitioned by n-hexane, purified using Florisil column, and determined by HPLC equipped with a variable wavelength detector (VWD). The results showed that when the spiked levels were 0.05 mg·kg-1to2.5 mg·kg-1, the average recovery of sulfoxaflor ranged from 76.81% to 94.43% with relative standard deviation (RSD) of 0.54% to 7.20%;the limit of detection(LOD)of sulfoxaflor was 1 ng, and the limit of quantification (LOQ) was 0.05 mg·kg-1in soil, cotton seeds and cotton leaves. The degradation of sulfoxaflor in soil and cotton leaves could be described with an equation: Ct=C0e-kt. The half-life of sulfoxaflor were1.36~5.10 d and 6.13~9.37 d in soil and cotton leaves, respectively. The wheat was sprayed with 50% water dispersible granule (WDG) at dosage0.6~0.9 g·30 m-2 (2~3times) atfull-bloomstage,theintervalperiodwas7 d,the final residues ofsulfoxaflorwere lowerthan LOQ insoil and cotton seeds.
Publication Year: 2014
Publication Date: 2014-01-01
Language: en
Type: article
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Cited By Count: 3
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