胺鲜酯在大白菜和土壤中的残留分析及消解动态
Residue analysis and dissipation of diethyl aminoethyl hexanoate(DA-6) in Chinese cabbage and soil
-
摘要: 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。Abstract: The analytical method of diethyl aminoethyl hexanoate(DA-6) residue and its dissipation in chinese cabbage and soil were investigated.Samples were extracted with ethyl-acetate,then cleaned up by dispersive SPE with PSA (primary secondary amine) and GCB (graphitized carbon black),followed by determination with GC-MS.The recoveries at the levels of 0.005-0.05 mg/kg were from 83.2% to 103.2% for Chinese cabbage and 83.0% to 98.5% for soil with coefficients of variation of 3.0% to 4.8% and 3.8% to 11.3%,respectively.The limit of detection was 0.001 mg/kg.The limit of quantification was 0.005 mg/kg for both Chinese cabbage and soil.Results of field trial showed that the half-life of DA-6 was 0.3 to 1.1 days in Chinese cabbage and 1.5 to 1.6 days in soil.The terminal residues of DA-6 in cabbage were lower than 0.06 mg/kg.
下载: