【目的】明确在人参生长期施用250g·L-1吡唑醚菌酯乳油在人参根、茎、叶和土壤中的残留动态及最终残留量．【方法】样品经丙酮提取，N-丙基乙二胺（PSA）固相萃取柱净化后，用液相色谱-串联质谱法检测．【结果和结论】施药剂量为666. 67g·hm-2（以有效成分计）时，吡唑醚菌酯在人参根、茎、叶和土壤中的降解半衰期为6. 35～8. 75d．施药剂量为333. 33～666. 67g·hm-2时，施药后60d吡唑醚菌酯在人参根、茎、叶和土壤中的最终残留量低于0. 0206mg·kg-1，因此建议施用250g·L-1吡唑醚菌酯乳油时，施药剂量不高于666. 67g·hm-2，施药1次，安全间隔期为35d．%[Objective]To identify the residual dynamics and final residues of pyraclostrobin 250 g · L-1 EC in the ginseng root , stem, leaf and soil after spraying during the ginseng growth period .[Method]The samples were extracted with acetone , cleaned up with primary secondary amine ( PSA) solid phase extraction cartridge , and determined by high performance liquid chromatography coupled with electros-pray mass spectrometry ( HPLC-MS/MS) .[Result and conclusion]The half lives of pyraclostrobin were from 6.35 to 8.75 d in the ginseng root, stem, leaf and soil with a spraying dosage of 666.67 g· hm -2 . Final residues of pyraclostrobin in the ginseng root , stem, leaf and soil were below 0.020 6 mg· kg -1 over 60 d at a spraying dosage ranging from 333.33 to 666.67 g· hm-2 .It is recommended that the pre-harvest interval of pyraclostrobin 250 g· L-1 EC should be set 35 d and sprayed one time at the dosage of no more than 666.67 g· hm-2 .
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