摘要
本文建立了混合除草剂吡嘧磺隆和苯噻酰草胺在水稻上的残留分析方法,并研究了其在水稻中的消解动态和最终残留.样品经乙腈超声提取、二氯甲烷液-液分配和Pesticarb/NH2SPE净化后,通过HPLC-UVD检测.该方法对水稻植株、糙米、稻壳和土壤中的吡嘧磺隆最小检出量(LOD)为2.0×10-10g;田水中的吡嘧磺隆和苯噻酰草胺最小检出量(LOD)为1.0×10-10g.该方法对水稻植株、糙米、稻壳和土壤中的苯噻酰草胺最小检出量(LOD)为2.0×10-10g.试验结果显示,8%吡嘧·苯噻酰颗粒剂施药量分别为675 g(a.i.)·ha-1(其中吡嘧磺隆为42.2 g(a.i.)·ha-1)和1012.5 g(a.i.)·ha-1(其中吡嘧磺隆为63.3 g(a.i.)·ha-1),施药1次,2010年北京施药后120 d,安徽施药后92 d,湖南施药后70 d收获期糙米、植株、土壤和稻壳中吡嘧磺隆的残留量均低于0.01 mg·kg-1.
An analytical method was developed for the determination of pyrazosulfuron and mefenacet residues in rice. Dissipation rate and residue content of the pesticides in rice were also studied. Pyrazosulfuron and mefenacet were extracted from plants and soil with acetonitrile, purified using Pesticarb/NH2 SPE, and then determined by HPLC with UV-detector. LOD of the method was 2.0×10^-10 g in the sample matrix of rice plants, brown rice, rice husk and soil and it was 1.0×10^-10 g in paddy water. The results showed that the rice was sprayed at 1 time at the dosages of 675 g（a.i.）·ha^-1 （the dosage of pyrazosulfuron was 42.2 g（a.i.）·ha^-1） and 1012.5 g（a.i.）·ha^-1 （the dosage of pyrazosulfuron was 63.3 g（a.i.）·ha^-1）. The residues of the pesticide in harvested brown rice, rice plant and rice husk were below 0.01 mg·kg^-1 after been applied pesticide 120 d in Beijing, 92 d in Anhui, 70 d in Hunan.
出处
《环境化学》
CAS
CSCD
北大核心
2013年第9期1653-1659,共7页
Environmental Chemistry
基金
中国科学院知识创新工程重要方向项目(KZCX2-YW-JS403)资助
