Residue analysis and dissipation of diethyl aminoethyl hexanoate(DA-6) in Chinese cabbage and soil

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.