二甲戊灵在烟草和土壤中的残留消解动态和残留量  

Residues and Decline Dynamics of Pendimethalin in Tobacco and Soil

作　　者：相振波[1] 孙惠青[1] 王秀国[1] 张倩[1] 杨立强[1] 闫晓阳[1] 宋超[1] 徐金丽[1] 郑晓[1] 方华[2] 李义强[1] 

机构地区：[1]中国农业科学院烟草研究所国家烟草专卖局病虫害监控与综防重点实验室,山东青岛266101 [2]浙江大学农业与生物技术学院农药与环境毒理研究所,杭州310058

出　　处：《农药》2013年第1期45-47,62,共4页Agrochemicals

基　　金：国家烟草专卖局重点项目(TS-06-20110039);烟草行业病虫害监测与综合治理重点实验室开放课题(BC 201008);国家自然科学基金(20907040)

摘　　要：[目的]为评价二甲戊灵在烟叶中使用的安全性,开展二甲戊灵在烟叶和土壤中的残留量与残留降解研究。[方法]进行2年2地田间试验。消解动态试验按二甲戊灵2 617 mg a.i./L杯淋1次,每株药液用量20 mL,定期取样;最终残留试验按二甲戊灵2617 mg a.i./L(1.5倍推荐高剂量)和1750 mg a.i./L(推荐高剂量)杯淋1次,施药后7、14、21 d取样。高效液相色谱法(带紫外检测器)对二甲戊灵进行定量分析。[结果]田间消解动态结果表明:二甲戊灵在烟叶和土壤中消解较快,半衰期分别为2.56～5.97、7.53～10.34 d,施药后35 d,烟叶和土壤中的消解率均达90%以上。按二甲戊灵2617、1750 mg a.i./L于烟草现蕾期杯淋施药1次,距末次施药后间隔21 d采样,烟叶中二甲戊灵的残留量低于0.02～0.12 mg/kg,土壤中的残留量低于0.005～0.037 mg/kg。[Aims] In order to evaluate the safety of the use of pendimethalin in tobacco, a supervised trial experiment was conducted to study the residues and decline dynamics of pendimethalin in tobacco and soil. [Methods] Field experiments were conducted in two different locations during two years. For dissipation trial, pendimethalin was sprayed at the concentration of 2617 mg a.i./L. For final residue trial, pendimethalin was applied at 2617 and 1750 mg a.i./L, respectively, corresponding to 1.5 times recommended and recommended concentrations. Tobacco leaves and soil were sampled at 7, 14, 21 d after application. Pendimethalin was analyzed by high performance liquid chromatography with UV detector. [Results] Results of the decline dynamics study showed that half-life values（t 1/2） were 2.56-5.97 d in tobacco leaves and 7.53-10.34 d in soil, respectively. The dissipation rates were above 90% in tobacco leaves and soil at 35 d after treatment. The ultimate residues of pendimethalin in tobacco leaves and soil were determined after the application at levels of 2617 and 1 750 mg a.i./L, with the residues below 0.12 mg/kg in tobacco leaves and below 0.037 mg/kg in soil 21 days after treatment.

关 键 词：二甲戊灵 烟草 土壤 残留 消解动态 

分 类 号：TQ450.263[化学工程—农药化工]