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采用超高效液相色谱法(UPLC)测定了氟虫双酰胺19.8%悬浮剂(SC)在水稻及稻田环境中的残留动态.结果表明,当氟虫双酰胺及其代谢产物NNI-des-iodo的添加量为0.05～1.0 mg·kg-1时,其在水稻田土壤、田水、稻秆、稻米和稻壳中的平均回收率为78.2%～104.8%,变异系数为1.1%～4.4%.氟虫双酰胺在2011年三地(福建福州、天津、江苏南京)的稻田水中的降解半衰期为9.8～17.3 d,土壤中10.8～22.4 d,植株中7.6～17.3 d,其在稻田水样品中检出了代谢产物NNI-des-iodo,而在土壤和植株样品中未检出.在推荐使用剂量下,于末次施药10 d后,氟虫双酰胺在水稻稻米中的残留量均低于美国规定的在稻谷上的最大残留允许量(0.5 mg·kg-1).
The residues of flubendiamide 19.8% SC in rice and paddy fields were determined by UPLC. The results showed that when the flubendiamide and its metabolites NNI-des-iodo , The average recoveries of paddy field soil, paddy field, rice straw, rice and rice husk ranged from 78.2% to 104.8%, and the coefficients of variation ranged from 1.1% to 4.4% The biodegradation half-life of flubendiamide in paddy water of three places (Fuzhou, Tianjin, Nanjing, Jiangsu Province) in 2011 was 9.8 ~ 17.3 days, in soil was 10.8 ~ 22.4 days, and in plants was 7.6 ~ 17.3 days. NNI-des-iodo metabolites were detected in the soil and plant samples were not detected in the recommended dose, 10 d after the last application, flubendiamide residues in paddy rice were low The maximum allowable amount of rice residue (0.5 mg · kg-1) in the United States.