螺虫乙酯在柑橘中的残留消减动态  

Degradation Dynamics of Spirotetramat Residue in Citrus

作　　者：吴文铸[1] 李菊颖 何健[1] 陈全博 单正军[1] 

机构地区：[1]环境保护部南京环境科学研究所/国家环境保护农药环境评价与污染控制重点实验室,江苏南京210042

出　　处：《生态与农村环境学报》2016年第6期1003-1007,共5页Journal of Ecology and Rural Environment

基　　金：农业部农药残留试验项目(2013P091);国家自然科学基金(41101307)

摘　　要：采用乙腈提取、N-丙基乙二胺(PSA)和无水硫酸镁净化、液质联用测定的方法,研究了江苏省苏州市、福建省福州市和重庆市柑橘施用螺虫乙酯农药后的螺虫乙酯母体及代谢产物在柑橘和土壤中的残留消减动力学规律以及最终残留情况。结果表明,螺虫乙酯母体在苏州、福州和重庆柑橘中的消减半衰期分别为6.7~9.6、4.7~9.5和7.8~9.5 d,在土壤中的消减半衰期分别为1.4~2.3、1.3~4.9和2.3~3.6 d。在柑橘中按照最高推荐剂量(有效成分60 mg·kg^(-1))和最高推荐剂量的1.5倍(90 mg·kg^(-1))施用螺虫乙酯,施药2~3次时,收获的柑橘中螺虫乙酯含量均低于最大残留限量MRL值(1.0 mg·kg^(-1))。Spirotetramat is commonly used in citrus orchards for pest control. A study was performed on residues of the pesticide and its metabolites in citrus and soil,their degradation dynamics and their fates in citrus orchards located at Suzhou,Fuzhou and Chongqing,using acetonitrile in extraction,N-propyl ethylenediamine( PSA) and anhydrous magnesium sulfate in purification,and the LC-MS/MS in determination. Results show that half- life of spirotetramat was in the range of 6. 7- 9. 6,4. 7- 9. 5 and 7. 8- 9. 5 d in the fruits from Suzhou,Fuzhou,and Chongqing,respectively,and in the range of 1. 4- 2. 3,1. 3- 4. 9 and 2. 3- 3. 6 d in the soils from the orchards at Suzhou,Fuzhou,and Chongqing,respectively. On such a basis,it is suggested that spirotetramat be applied at a rate of the highest recommended dosage( 60 mg·kg- 1in active ingredient) and a rate,1. 5 times the highest recommended dosage( 90 mg·kg- 1,in active ingredient) twice and three times a season to keep residue of the substance in citrus below the upper limit of MRL( 1. 0mg·kg- 1).

关 键 词：螺虫乙酯 代谢产物 柑橘 消减动态 残留 

分 类 号：X592[环境科学与工程—环境工程]