吡虫啉在菜用大豆上残留动态及安全使用技术研究  

Residue and Safe Application of Imidacloprid on Vegetable Soybean

作　　者：蔡恩兴[1] 

机构地区：[1]漳州市农业检验监测中心,福建漳州363000

出　　处：《福建农业学报》2009年第3期241-245,共5页Fujian Journal of Agricultural Sciences

基　　金：漳州市科技计划项目(Z03028)

摘　　要：为了评价吡虫啉在菜用大豆上使用后的残留行为及环境安全性，采用高效液相色谱法研究了菜用大豆中的残留与消解动态，并对其安全使用技术进行示范试验。结果表明，吡虫啉在菜用大豆上的原始沉积量因不同施药处理有所差异，残留消解动态符合一级动力学方程，不同施药处理的消解速率基本趋于一致，消解系数（｜k｜）=0．186.3±0．0149，半衰期（DT50）为3．5～3．9d，消解99％所需要的时间（T99）为22．9～26．0d。在菜用大豆接近采收时，按常规施药方法，每667m。施用吡虫啉有效成分3．00g，施药1次的在施药后3d残留量均〈1．0mg·kg^-1，残留量平均为0．299mg·kg^-1；间隔7d连续施药2次的，在第2次施药后5d的残留量均〈1．omg·kg^-1，残留量平均为0．374mg·kg^-1，产品质量安全水平均达到日本、美国的MRL要求。To determine the changes in residue and environmental safety of imidacloprid application on soybeans used as a vegetable, HPLC and field experimentation were conducted. At the same time, a safe application method of the insecticide was developed. The result showed that （a） the imidacloprid degradation followed first order kinetic, （b） the initial imidacloprid residue amount varies with method of application, （c） the degradation rates were basically the same, （d） the degradation coefficient, （ ｜ k ｜ ）, was 0. 186 3±. 014 9, （e） the DT50 was 3.5-3.9 d, and （f） the T99 was 22.9-26.0 d. The soybeans were sprayed with 3.00 g of effective imidacloprid per 667 m^-2 near time of harvest. The insecticide residues, 3 days after the application, were all less than 1.0 mg · kg^-1 , averaging 0. 299 mg · kg^-1. When the spray was applied twice at 7d interval, the residues were all less than t. 0 mg · kg^-1 averaging 0. 374 mg · kg^-1 , 5d after the second spray. The residue levels on the soybeans were all below the Japanese or American MRL requirements.

关 键 词：菜用大豆 吡虫啉 残留量 消解动态 安全使用技术 

分 类 号：S481[农业科学—农药学] S435[农业科学—植物保护]