Residue and Degradation Dynamic of Buprofezin in Citrus and Soil

[Objective] The paper was to detect the residue of buprofezin in citrus and soil.[Method] Gas chromatography(GC)method was used to measure the residue of buprofezin in citrus and soil.[Result] The average recovery rate of buprofezin in entire citrus fruit was 96.17%-97.38%,and the variation coefficient was 6.10%-9.07%;the average recovery rate in pulp was 95.24%-105.46%,and the variation coefficient was 3.30%-6.01%;the average recovery rate in peel was 88.76%-93.64%,and the variation coefficient was 5.12%-6.27%;the average recovery rate in soil was 97.79%-104.3%,and the variation coefficient was 2.45%-9.21%.The degradation dynamics and the final residue results of buprofezin in citrus and soil showed that the degradation half-lives in citrus in Changsha(Hunan),Hangzhou(Zhejiang)and Guiyang(Guizhou)were 7.65,7.64 and 8.40 d,and the degradation half-lives in soil in three places were 13.75,9.97 and 10.18 d,respectively.[Conclusion] When 25% buprofezin SC watered agent were sprayed in citrus fruits for 2-3 times according to the recommended dose of 166.7-250.0 mg/L,the safe period of buprofezin in citrus could be set as 14 d.