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[目的]研究乙草胺在水稻中的消解动态及最终残留量。[方法]通过黑龙江、吉林和湖南2年3地的田间小区试验和气相色谱分析技术,分析乙草胺在水稻上的残留动态,测定最终残留量。[结果]乙草胺在水稻上的半衰期为4.4～8.3d,半衰期较短,属于易降解农药。在有效成分为600和900g/hm2的剂量条件下,施药1次,测得水稻中乙草胺残留量均低于0.01mg/kg。[结论]综合多方面因素,按照900g/hm2施药剂量处理,建议我国乙草胺在水稻上的MRL值可暂定为0.02mg/kg,施药次数1次。
[Objective] The study aimed to study the digestion dynamics and final residues of acetochlor in rice. [Method] The residue dynamics of acetochlor on rice was analyzed through field plot test and gas chromatographic analysis technique in two years in Heilongjiang, Jilin and Hunan provinces. The final residue was determined. [Result] The half-life of acetochlor in rice was 4.4 ~ 8.3d with a short half-life and was a degradable pesticide. When the active ingredient was 600 and 900g / hm2, the pesticide residues were all below 0.01mg / kg in rice. [Conclusion] The treatment of 900g / hm2 dose suggested that the MRL value of acetochlor on rice could tentatively be 0.02mg / kg and the application frequency was 1 time.