【摘要】 目的:研究了多菌灵在白术根、土壤中的残留消解动态,并对其安全使用标准进行了讨论。方法:采用甲醇提取,液液分配净化,高效液相色谱分析。结果:不同添加浓度下回收率为86.1%～98.3%,RSD 1.0%～6.5%,满足农药残留检测要求。田间试验分别用推荐剂量(0.675 kg a.i..hm-2)和1.5倍推荐剂量(1.000 kg a.i..hm-2)进行处理,2年两地结果表明,多菌灵50%WP在白术土壤中的半衰期为6.51～7.98 d,在根中残留趋势为先升后降,半衰期为4.51～6.50 d,初加工后干样多菌灵的残留量为0.042～0.433 mg.kg-1,明显高于加工前新鲜样品残留量。结论:如果多菌灵在白术及其土壤中的MRL(最大残留限量)值推荐为0.2 mg.kg-1,建议按照常规剂量(0.675 kg a.i..hm-2)每年喷施2次,白术上最后一次使用多菌灵距收获的安全间隔期可考虑暂定为21 d。更多还原

【Abstract】 Objective: To study the residue of in roots of Atractylodes macrocephalal and in soil.Method: Samples were extracted with methanol.The extracts were cleaned up by liquid-liquid extraction and detected by HPLC.Result: Repeatability and accuracy of the method was verified by fortified recovery at 0.01,0.05,0.1,0.2 mg·kg-1 levels.Average recovery were 86.1%-98.3% and RSD were 1.0%-6.5% in root and soil.A.macrocephala was treated with two dosage of carbendazim during growing.Results of field test showed that the half lives of carbendazim were 6.51-7.98 d in cultivated soil,4.51-6.50 d in roots,separately.After sample was preliminarily processed,the residue of dried samples was 0.042-0.433 mg·kg-1,higher than the fresh samples.Conclusion: If 0.2 mg·kg-1 is recommended as the MRL(maximum residues limited) of carbendazim in the roots of A.macrocephala,it is suggested that the dose of 0.675 kg a.i.·hm-2 carbendazim is sprayed twice a year,and carbendazim should not be used within 21 days before the harvest.更多还原