小麦中二甲四氯异辛酯残留分析及其代谢物转化研究
- 文献标志码:
- A
- 摘要:
- 为提高农药残留检测灵敏度和准确度,本文建立了二甲四氯异辛酯在小麦籽粒、植株及秸秆中的固相萃取-气相色谱残留分析方法。样品经乙腈和水混合振荡提取,盐析后取有机相经氨基固相萃取柱净化,GC-μECD测定。研究小麦中二甲四氯异辛酯的残留及其代谢物的转化情况,以及农药75%二甲四氯异辛酯乳油在小麦上施用以后的安全情况。结果表明:二甲四氯异辛酯在麦粒、植株和秸秆中的平均回收率为82.5%~99.3%,相对标准偏差(RSD)在2.8%~12.9%,在麦粒中的最小检测浓度为0.05 mg?kg-1。田间试验中施药1 d后二甲四氯异辛酯在植株内的消解率在60%以上,且可检测到代谢物二甲四氯;二甲四氯的消解符合一级动力学方程,半衰期为9.6~10.2 d。小麦籽粒中二甲四氯异辛酯的残留量均小于0.05 mg?kg-1,二甲四氯的残留量均小于0.02 mg?kg-1,低于我国国家标准(GB 2763-2019)。二甲四氯异辛酯在植株体内可快速代谢为二甲四氯;参照我国制定的小麦中二甲四氯异辛酯及二甲四氯的MRL值,75%二甲四氯异辛酯乳油在小麦上按照推荐方法施用是安全的。
参考文献/References:
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备注/Memo
收稿日期:2020-08-13