扑海因悬浮剂在番茄和土壤中的残留动态研究  

Residue Dynamics of Iprodione in Tomato and Soil

作　　者：陈莉 戴荣彩[1] 陈家梅[1] 夏福利[1] 

机构地区：[1]北京市农林科学院植物保护环境保护研究所,北京100089

出　　处：《农业环境科学学报》2005年第z1期311-314,共4页Journal of Agro-Environment Science

摘　　要：为评价扑海因悬浮剂在番茄上使用后的残留动态及环境安全性,在北京和杭州市郊区对其在番茄上的残留进行了动态和最终残留进行了试验,用带ECD检测器的气相色谱测定了其有效成分异菌脲的残留量。异菌脲的最低检出量为1.8×10-11g;在番茄中的最低检出浓度为0.007 mg.kg-1,在土壤中的最低检出浓度为0.018 mg.kg-1。在番茄和土壤中的平均回收率为94.1%~99.4%,变异系数为0.9%~5.5%,符合农药残留分析的要求。研究结果表明:异菌脲在番茄和土壤中的降解均较快,在番茄上的半衰期为3.2~4.2 d,在土壤中的半衰期为5.4~6.6 d;在推荐剂量和1.5倍推荐剂量下,异菌脲在番茄中的最终残留量都低于最大残留限量,保证了番茄食用的安全性。Field trail for iprodione residue in tomato and soil were conducted in suburbs of Beijing and Hangzhou city,respectively.Residues of iprodione were extracted from tomato and soil with acetone,purified by liquid-liquid partition and Florisil,concentrated and determined by gas chromatography with electron capture detector(ECD).The lowest detection limit of instrument for iprodione was 1.8×10^(-11)g,and the limit of quantification was 0.007 mg·kg^(-1) for tomato,0.018 mg·kg^(-1) for soil.The average recovery was 94.1%～99.4%,and coefficient of variation was 0.9%～5.5%,respectively.The two-year's results showed that iprodione dissipated rapidly in tomato and soil.The half-lives of iprodione in tomato and soil were 3.2～4.2 days,5.4～6.6 days,respectively.When the tomato was sprayed three times or four times with 50% Rovral SC at the doses of 750 g ai·hm^(-2) and 1125 g ai·hm^(-2),at the second,fourth and sixth day after the last application,the final residue of iprodione was 0.040～0.336 mg·kg^(-1) in tomato and 0.023～1.532 mg·kg^(-1) in soil,which did not exceed maximum residue limit 5 mg·kg^(-1) established by WHO/FAO.According to the results,we recommended applying 50% Rovral SC three times at a dose of 750 g ai·hm^(-2) with a safe interval of 2 days from harvest.

关 键 词：扑海因 异菌脲 番茄 残留 消解 

分 类 号：S481.8[农业科学—农药学] X592[农业科学—植物保护]