茚虫威在菜用大豆上残留动态及安全使用技术  

Residual Dynamics and Safe Usage Technology of Indoxacarbon Vegetable Soybean

作　　者：陈丽萍[1] 郭建辉[1] 蔡恩兴[1] 张维德[1] 

机构地区：[1]漳州市农业检验监测中心,福建漳州363000

出　　处：《农药学学报》2008年第4期443-449,共7页Chinese Journal of Pesticide Science

基　　金：漳州市科技计划项目(Z03028)

摘　　要：采用气相色谱法(GC/ECD)研究了菜用大豆中茚虫威残留量的检测方法,以及茚虫威在菜用大豆上的残留消解动态,并对其安全使用技术进行了示范试验。结果表明,建立的菜用大豆中茚虫威残留量定量检测方法的平均回收率为86.8%～90.1%,相对标准偏差为3.85%～5.24%,最小检出量0.01ng,最低检测浓度为0.005mg/kg,该方法简便、准确、能满足实际样品分析。茚虫威在菜用大豆上的原始沉积量因不同施药处理有所差异,施用有效成分96.43g/hm2的原始沉积量>施用有效成分48.21g/hm2的原始沉积量,间隔期7d连续施药两次的原始沉积量>施药1次;残留消解动态符合一级动力学方程,早季的消解系数(︱k︱)=0.17475±0.00015,半衰期(T1/2)为4.0d,消解99%所需要的时间(T0.99)为26.3～26.4d;晚季︱k︱=0.10835±0.00495,T1/2为6.1～6.7d,T0.99为40.6～45.5d。在安全使用技术示范试验区,茚虫威按常规施药量(有效成分67.50g/hm2)及施药方法,2006年晚季施药1次与间隔期7d连续施药两次,在末次施药后25d、30d,最终残留量分别为0.065～0.102mg/kg和0.032～0.081mg/kg;2007年早季间隔期7d连续施药两次,在第2次施药后15d,最终残留量为0.097～0.132mg/kg,产品质量安全水平均符合日本规定的MRL(0.2mg/kg)要求。The method of quantitative determination of indoxacarb residue on soybean was established by GC/ECD. The residual dissipation dynamics of indoxacarb was studied and the safe application technology was demonstrated. The results showed that the method of quantitative determination was simple,accurate and available. The average recovery was ranged from 86.8% to 90. 1% ,RSD was ranged from 3.85% to 5.24% ,LOD was 0.01 ng and LOQ was 0.005 mg/kg. The original sediment content of indoxacarb was different while different pesticide treatment was applicated. The original sediment sprayed with 96.43 g/hm2 of the effective composition was more than sprayed with 48.21 g/hm2 . When indoxacarb was sprayed twice at 7 days intervals, the original sediment content was more than sprayed only once. Field residue decline study of indoxacarb in soybean was followed first order kinetic equation. In early season the decline coefficient （ ｜k｜ ） was 0. 174 75± 0. 000 15, T1/2 was 4.0 d, T0.99 was 26.3 ±26.4 d,and in late season｜ k ｜ was 0.108 35 ±0.004 95 ,T1/2 was 6.1 - 6.7 d, T0.99 was 40.6 - 45.5 d. In the demonstration field, after 25 d and 30 d of the last spraying with conventional dosage （ i. e. 67. 50 g/hm2 ） in the late season of 2006, the residue was 0. 065 0. 102 mg/kg for spraying once and was 0. 032 - 0. 081 mg/kg for spraying twice at 7 d intervals respectively. After 15 d of the second spraying ,the residue for spraying twice at 7 d intervals was 0.097 0.132 mg/kg in the early season of 2007. The residue was less than 0.2 mg/kg which was accorded with the demands of MRL in Japan.

关 键 词：菜用大豆 茚虫威 残留消解动态 安全使用技术 

分 类 号：TQ450.263[化学工程—农药化工] O657.71[理学—分析化学]