Simultaneous determination of residues of eight amide herbicides in fresh ginger

An analytical method for the simultaneous determination of residues of 8 amide herbicides (propyzamide,propanil,acetochlor,metolachlor,alachlor,butachlor,pretilachlor,mefenacet) in fresh ginger using gas chromatography with electron capture detector (GC-ECD) was developed.The samples were extracted with ethyl acetate by ultrasonic,pH was adjusted to 7 with NaOH solution for reducing interference and further clean-up was carried out by primary secondary amine.It showed that good linearity was obtained between 0.01 and 1 mg/L with correlation coefficients above 0.995.The limits of detection were 4~10 μg/kg and the limits of quantification were 0.05 mg/kg.Fortified recoveries at 0.05,0.1 and 1 mg/kg were between 79.0% and 111.2% with the relative standard deviations (RSD) from 0.9% to 11.5%,respectively.