哒螨酮在菜用大豆上残留动态及安全使用技术研究  

Residual dynamics and safely applying technology of pyridaben in vegetable-soybean

作　　者：郭建辉[1] 

机构地区：[1]漳州市农业检验监测中心,漳州363000

出　　处：《中国生态农业学报》2009年第1期105-109,共5页Chinese Journal of Eco-Agriculture

基　　金：漳州市科技计划项目(Z03028)"豆类蔬菜农药残留监测及安全使用技术研究"资助

摘　　要：为监测菜用大豆中哒螨酮的残留量及科学、安全使用哒螨酮防治菜用大豆的害螨害虫,采用气相色谱法(GC-ECD)及田间试验方法,研究了菜用大豆中哒螨酮残留量定量检测方法及哒螨酮在菜用大豆上的残留消解动态,并对其安全使用技术进行示范试验。结果表明,建立的菜用大豆中哒螨酮残留量定量检测方法的添加回收率为88.8%～94.0%,相对标准偏差(RSD)为2.2%～4.7%,最小检测量为0.01ng,最低检出浓度为0.005mg·kg-1,该分析方法简便、准确,能满足实际样品分析要求。哒螨酮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C=A·ekt的指数回归方程,相关系数(|r|)为0.9648～0.9953(P<0.01);2004年、2005年晚季及不同施药处理的消解速率基本一致,消解系数(|k|)为0.1810～0.2039,半衰期(T1/2)为3.4～3.8d,消解99%所需时间(T0.99)为22.6～25.4d。在菜用大豆上按常规施药方法施用有效成分为84.38g·hm-2的哒螨酮,施药1次及间隔期7d连续施药2次,末次施药后18d残留量均<0.1mg·kg-1,平均残留量分别为0.054mg·kg-1、0.059mg·kg-1,产品质量安全水平符合日本规定的MRL要求。In order to monitor pyridaben residue in vegetable-soybean and apply pyridaben scientifically and safely in pest control, the residual content and degradation dynamics of pyridaben in vegetable-soybean were studied by GC-ECD method and field experiment. Meanwhile the safe usage technology demonstration experiments were set up. The established quantitative determination method is simple, accurate and available with 88.8% - 94.0% average recoveries of pyridaben residue in vegetable-soybean, 2.2% - 4.7% RSD, 0.01 ng LOD and 0.005 mg·kg^-1 LOQ. The original sediment of pyridaben is different for different treatments and the residue degradation dynamics follows the exponential regression equation： C = A · e^kt with a correlation coefficient （｜r｜） range of 0.964 8 - 0.995 3 （P 〈 0.01）. The degradation rate of pyridaben in vegetable-soybean is basically consistent in the late seasons of 2004 and 2005 for the different treatments. Pyridaben degradation coefficient （｜k｜） is 0.181 0 -0.203 9. T1/2 and T099 of pyridaben are 3.4 - 3.8 d and 22.6 - 25.4 d respectively. Based on conventional application method, vegetable-soybean is sprayed once or twice （at 7 d intervals） in the demonstration fields with 84.38g·kg^-1 effective composition of pyridaben. The final residue in vegetable-soybean products is less than 0.1 mg·kg^-1, with average residual contents of 0.054 mg·kg^-1, 0.059 mg·kg^-1 at 18 d after application. The quality of the products meets the minimum requirement level （MRL） of Japan.

关 键 词：菜用大豆 哒螨酮 残留 消解动态 安全使用技术 

分 类 号：X592[环境科学与工程—环境工程]