25%噻虫嗪水分散粒剂在青葱和大葱上的残留与安全性评价

Residue and safety evaluation of 25% thiamethoxam water-dispersible granules on scallions (Allium fistulosum L. var. giganteum Makion) and leeks (Allium ascalonicum)

中文关键词:  农药残留  超高效液相色谱-串联质谱法  青葱  大葱  噻虫嗪

英文关键词:pesticide residue  ultra performance liquid chromatography tandem mass spectrometry  scallions  leeks  thiamethoxam

中文摘要:

      目的 评价噻虫嗪在葱上使用后的安全性。方法 2018—2019年在辽宁、内蒙古、河南、山东、江苏和四川开展了25%噻虫嗪水分散粒剂在大葱和青葱上的残留试验。样品用乙腈提取, N-丙基乙二胺、石墨化炭黑和十八烷基碳混合分散吸附剂净化, 超高效液相色谱法分离, 三重四极杆串联质谱法检测, 外标法定量。结果 噻虫嗪在青葱上的半衰期为3.5 d, 在大葱上的半衰期为1.4 d; 噻虫嗪在在青葱上的最终残留浓度为0.020~0.176 mg/kg, 大葱上的最终残留浓度为0.005~0.165 mg/kg。结论 本研究结果可为噻虫嗪在葱上的安全使用和食品安全限量标准制定提供支持。

英文摘要:

      Objective To evaluate the safety of using thiamethoxam on scallions and leeks. Methods The independent field trials with 25% thiamethoxam water-dispersible granules were conducted during the crop year of 2018—2019 in Liaoning, Inner Mongolia, Henan, Shandong, Jiangsu and Sichuan. Thiamethoxam and clothianidin was extracted from samples with acetonitrile, subsequently cleaned-up with primary secondary amine, graphite carbon and octadecyl carbon sorbent prior, and determined by ultra performance liquid chromatography tandem mass spectrometry. The quantification was performed by the external standard method. Results The half-life of thiamethoxam on scallions was 3.5 d and on leeks was 1.4 d. The final residue of thiamethoxam on scallions were 0.020?0.176 mg/kg and leeks were 0.005?0.165 mg/kg. Conclusions The results of this study will be useful in providing support for the development of safety standards and in ensuring that thiamethoxam are used safely in the future.