摘要
[目的]评价氯吡嘧磺隆在玉米上使用的安全性,建立其使用规范。[方法]于2009—2010年在南京和郑州两地进行了75%氯吡嘧磺隆水分散粒剂在玉米和土壤中的消解动态和最终残留试验。样品用丙酮提取,乙酸乙酯萃取净化后,用超高效液相色谱-电喷雾串联四极杆质谱检测,外标法定量。[结果]消解动态试验结果表明：在植株和土壤中半衰期分别为0.78~0.97、7.00~16.90 d。最终残留试验表明：75%氯吡嘧磺隆按推荐剂量（45 g a.i./hm2）和推荐剂量的1.5倍（67.5 g a.i./hm2）施药,玉米苗后3~5叶期施药1次,玉米收获期采样,检测的玉米籽粒、玉米植株及土壤中氯吡嘧磺隆的残留量均低于0.1 mg/kg。[结论]拟推荐我国氯吡嘧磺隆在玉米和玉米秸秆上的最大残留限量为0.1 mg/kg。
It was to evaluate the safety and establish the regular use of halosulfuron-methyl in corn field.[Methods] The field trail for halosulfuron-methyl 75% WG were conducted in corn and soil in Nanjing and Zhengzhou between year 2009-2010.Samples were extracted by acetone and purified by ethyl acetate,detected by ultra performance liquid chromatography-electrospray tandem mass spectrometry（UPLC-MS/MS）,and quantified by external standard method.[Results] The results from field experiment of degradation dynamic indicated that the half-lives of halosulfuron-methyl in corn plant and soil were 0.78-0.97,7.00-16.90 d,respectively.The final residue indicated that when the corn plant was sprayed once in postemergence with halosulfuron-methyl 75% WG at the recommended dosage 45 g a.i./ha and 1.5 times of the recommended dosage（67.5 g a.i./ha）,and sample was taken when harvested.The total residue of halosulfuron-methyl in corn seed,plant and soil were less than 0.1 mg/kg.[Conclusions] The recommended MRL for halosulfuron-methyl in corn and corn plant was 0.1 mg/kg in China.
出处
《农药》
CAS
北大核心
2011年第12期906-908,共3页
Agrochemicals
关键词
氯吡嘧磺隆
玉米
土壤
消解动态
农药残留
halosulfuron-methyl
corn
soil
degradation dynamics
pesticide residue
