苯醚甲环唑在香蕉中的残留及消解动态

采用田间试验和气相色谱ECD检测方法,研究了苯醚甲环唑在香蕉中的残留降解动态和最终残留量。结果表明,苯醚甲环唑在云南、海南和广东香蕉中的半衰期为17.2～22.4 d。最终残留量与苯醚甲环唑施药剂量、施药次数和采收至最后一次施药间隔时间有关。苯醚甲环唑25%乳油按推荐剂量施药3次,距最后一次施药间隔42 d,收获的香蕉全果中苯醚甲环唑留量小于0.33 mg·kg-1,蕉肉中残留量小于0.046 mg·kg-1,低于我国规定的最大残留限量标准(MRL值)1.0 mg·kg-1。栽培措施香蕉断蕾后套袋能显著减少苯醚甲环唑在香蕉中的残留量。

Final residues and residue dynamics of difenoconazole in banana

Degradation dynamics and final residues of difenoconazole in banana were estimated by GC-ECD and field experiment.The results showed that the half-life of difenoconazole in banana was 17.2 to 22.4 days in Yunnan,Hainan and Guangdong.The results of the final residue assay indicated that the residue levels of difenoconazole in banana all increased as the application dosage and application times increased,or as the harvest interval decreased.When the banana was treated by 25% difenoconazole,EC at recommended dose 3 times,on day 42 after the last application,the final residues of difenoconazole in the banana were below 0.33 mg·kg-1,and the final residues of difenoconazole in banana meat were below 0.046 mg·kg-1,which was less than the maximum residue limit(MRL) of difenoconazole in banana stipulated by China(1.0 mg·kg-1).Bagging can significantly reduce the residue of difenoconazole in banana and improve the exterior quality such as the appearance of banana