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.
出处
《农药》
CAS
CSCD
北大核心
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)
关键词
二甲戊灵
烟草
土壤
残留
消解动态
pendimethalin
tobacco
soil
residue
decline dynamics
