复配剂苯丁·哒乳油中哒螨酮在柑桔和土壤中的残留动态研究  

Residue Dynamics of Pyridaben in Mixed Formulation of Fenbutatin Oxide and Pyridaben E.C in Citrus and Soil

作　　者：李蓓[1] 杨仁斌[1] 佘佳荣[1] 付强[1] 

机构地区：[1]湖南农业大学农业环境保护研究所,湖南长沙410128

出　　处：《农业环境科学学报》2008年第5期2043-2047,共5页Journal of Agro-Environment Science

基　　金：农业部农药残留基金项目(NC060023)

摘　　要：采用田间试验的方法,研究了哒螨酮在柑桔及土壤中的残留动态,应用气相色谱法测定了哒螨酮在柑桔和土壤中的残留量。结果表明,哒螨酮在柑桔和土壤中消解较快,其半衰期分别为3.53￣13.50d和3.13￣10.53d;10%苯丁·哒乳油兑水稀释1500倍(哒螨酮浓度为33.3mg·L-1),使用3次,末次施药20d后,哒螨酮在柑桔肉残留量为未检出,在柑桔皮中为未检出￣0.0823mg·kg-1,在土壤中为未检出￣0.0783mg·kg-1。该药属易分解农药(T1/2<30d),按推荐使用剂量使用是安全的。In order to make up a standard procedure for safe use of pyridaben （the active ingredient of 5% in mixed formulatio）on citrus, a field experiment was conducted to reveal the residue dynamics and residues of pyridaben in citrus and soil distributed in Changsha and Hangzhou two places.The residues of pyridaben in citrus and soil were determined by gas chromatography with ECD detector.Citrus and soil samples were extracted with acetone and cleaned up by liquid-liquid distribution and column filled with anhydrous sodium sulfate and neutral aluminum oxide.When adding of pyridaben at the concentration of 0.05-0.5 mg·kg^-1,The average recovery of pyridaben was in a range of 84.41%-93.08%,and coefficient of variation was 1.6%-11.69%. The degradation of pyridaben in 10% fenbutatin oxide and pyridaben E.C in citrus and soil was investigated using above method. The results showed that the degradation of pyridaben in citrus and soil was in accord with the regression equation. The half-lives in cirtus and soil were 3.53-13.50 d and 3.13-10.53 d, respectively.When the cirrus was sprayed three times with fenbutatin oxide and pyridaben 10%E.C dilution of（ 1：1 500 concentration of pyridaben was 33.3 mg·L^-1）,at the 20th day after the last application,the final residues of pyridaben in pulp,peels and soil were ND,ND-0.0823,ND-0.078 3 mg·kg^-1, respectively, suggesting that pyridaben belonged to non-persistent pesticides （T1/2〈30 days）. The result could offer certain scientific experimental referrence for reasonably using the pyridaben and appraising its enviromental security in China.

关 键 词：哒螨酮 消解 残留 柑桔 气相色谱法 

分 类 号：X592[环境科学与工程—环境工程]