[目的]通过2年3地的田间试验及残留检测,明确唑胺菌酯在黄瓜及土壤中的消解动态和最终残留量。[方法]消解动态试验按剂量300 g a.i./hm2施药1次;最终残留试验按300 g a.i./hm2(高剂量)和200 g a.i./hm2(低剂量)分别施药4、5次;采用高效...[目的]通过2年3地的田间试验及残留检测,明确唑胺菌酯在黄瓜及土壤中的消解动态和最终残留量。[方法]消解动态试验按剂量300 g a.i./hm2施药1次;最终残留试验按300 g a.i./hm2(高剂量)和200 g a.i./hm2(低剂量)分别施药4、5次;采用高效液相色谱法对20%唑胺菌酯悬浮剂有效成分进行检测。[结果]2年3地的消解动态试验结果表明:唑胺菌酯在黄瓜和土壤中的消解半衰期分别为2.86~5.63、4.61~13.25 d。最终残留试验结果表明:唑胺菌酯在黄瓜和土壤中的最终残留量分别为<0.020~0.380、<0.020~1.134 mg/kg。[结论]建议唑胺菌酯在黄瓜中的最大残留限量为0.08 mg/kg;20%唑胺菌酯悬浮剂按其推荐剂量200 g a.i./hm2在黄瓜上施用4次,安全间隔期为3 d。展开更多
A method for determination of pyraclostrobin in vegetables by UPLC-MS/MS was established.Pyraclostrobin was extracted by acetonitrile and cleaned by Bond Elut PlexaTM PCX cartridges.The analyte was separated with 5 ...A method for determination of pyraclostrobin in vegetables by UPLC-MS/MS was established.Pyraclostrobin was extracted by acetonitrile and cleaned by Bond Elut PlexaTM PCX cartridges.The analyte was separated with 5 mmol/L ammonium acetate(containing 0.1% formic acid)-acetonitrile as mobile phase and determined by UPLC-MS/MS.The quantitation limit in vegetables was 1.0 ng/kg.When spiked 1-10 ng/kg in vegetables,the mean recovery was over 70%,and the RSDs were less than 12%.展开更多
文摘[目的]通过2年3地的田间试验及残留检测,明确唑胺菌酯在黄瓜及土壤中的消解动态和最终残留量。[方法]消解动态试验按剂量300 g a.i./hm2施药1次;最终残留试验按300 g a.i./hm2(高剂量)和200 g a.i./hm2(低剂量)分别施药4、5次;采用高效液相色谱法对20%唑胺菌酯悬浮剂有效成分进行检测。[结果]2年3地的消解动态试验结果表明:唑胺菌酯在黄瓜和土壤中的消解半衰期分别为2.86~5.63、4.61~13.25 d。最终残留试验结果表明:唑胺菌酯在黄瓜和土壤中的最终残留量分别为<0.020~0.380、<0.020~1.134 mg/kg。[结论]建议唑胺菌酯在黄瓜中的最大残留限量为0.08 mg/kg;20%唑胺菌酯悬浮剂按其推荐剂量200 g a.i./hm2在黄瓜上施用4次,安全间隔期为3 d。
文摘A method for determination of pyraclostrobin in vegetables by UPLC-MS/MS was established.Pyraclostrobin was extracted by acetonitrile and cleaned by Bond Elut PlexaTM PCX cartridges.The analyte was separated with 5 mmol/L ammonium acetate(containing 0.1% formic acid)-acetonitrile as mobile phase and determined by UPLC-MS/MS.The quantitation limit in vegetables was 1.0 ng/kg.When spiked 1-10 ng/kg in vegetables,the mean recovery was over 70%,and the RSDs were less than 12%.
