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建立了胺鲜酯在大白菜及土壤中的残留分析方法。样品经乙酸乙酯提取、N-丙基乙二胺(primary secondary amine,PSA)和石墨化碳黑(graphitized carbon black,GCB)分散固相萃取净化后,采用气相色谱-质谱(GC-MS)检测,外标法定量。结果表明:当胺鲜酯在大白菜和土壤中的添加水平在0.005～0.05 mg/kg时,其回收率分别为83.2%～103.2%和83.0%～98.5%,相对标准偏差(RSD)分别为3.0%～4.8%和3.8%～11.3%。在土壤和大白菜中胺鲜酯的检出限为0.001 mg/kg,定量限为0.005 mg/kg。田间试验结果表明,胺鲜酯在大白菜和土壤中的半衰期分别为0.3～1.1 d和1.5～1.6 d,在大白菜中的最终残留小于0.06 mg/kg。
A method for the analysis of residues of amidoester in Chinese cabbage and soil was established. The samples were purified by solid phase extraction (SPE) using ethyl acetate, primary secondary amine (PSA) and graphitized carbon black (GCB). The samples were analyzed by gas chromatography-mass spectrometry Testing, external standard method. The results showed that the recoveries were 83.2% ~ 103.2% and 83.0% ~ 98.5%, respectively. The relative standard deviations (RSDs) of urethane in Chinese cabbage and soil were 0.005 ~ 0.05 mg / 3.0% ~ 4.8% and 3.8% ~ 11.3%. The detection limit of amyloside in soil and Chinese cabbage was 0.001 mg / kg and the limit of quantification was 0.005 mg / kg. The results of field trials showed that the half lives of amyloside in Chinese cabbage and soil were 0.3-1.1 d and 1.5-1.6 d respectively, and the final residues in Chinese cabbage were less than 0.06 mg / kg.