GC-FPD法分析检测人参中4种有机磷农药残留

Determination of Four Organophosphorus Pesticides Residue in Ginseng by GC-FPD

建立了同时测定人参中久效磷、乐果、马拉硫磷和对硫磷4种有机磷农药残留气相色谱分析方法。以乙酸乙酯进行超声及振荡提取，用气相色谱火焰光度检测器测定。结果表明，久效磷、乐果、马拉硫磷和对硫磷4种有机磷农药的线性范围为0．02～5mg／L，相关系数r为0．9996—0．9999。4种有机磷农药在人参中的最低检测浓度均为0．01mg／k，平均回收率为80．9％-98．9％，变异系数为2．53％～6．78％，并应用该方法测定了市场上5个生晒参样品中这4种有机磷农药的残留量，符合农药残留测定要求。

An analytical method for determining four organophosphoms pesticides Monocrotophos, Dimethoate, Malathion and Parathion residues in ginseng by GC was described. The samples were extracted with ethyl acetate, detected by GC with FPD detector. The results showed that the linear range of four organophosphorus pesticides were from 0.02 to 5mg/L, the correlation coefficients were 0.999 6 to 0.999 9;the minimum detectable concentration of the 4 analytes in ginseng samples were all 0.01 mg/kg; average recoveries were 80.9 to 98.9 %, and the coefficient of variation ranged from 2.53 to 6.78 %. The proposed method was applied to the determination of four organophosphorus pesticide residue in dried raw ginseng from market. The results of test have met the requirement of pesticide residue analysis.