气相色谱–质谱法测定食用植物油中23种农药残留

建立了测定食用植物油中23种农药残留的气相色谱–质谱联用方法。采用固相萃取,以乙腈超声提取,经过PSA,C_(18)柱进行净化,用气相色谱–质谱法测定,外标法定量。23种农药在0.01~1.0 mg/L范围内与色谱峰面积线性关系良好,相关系数为0.997 3~0.999 7,方法检出限为5~15μg/kg。测定结果的相对标准偏差为2.25%~9.40%(n=6),加标回收率为78.4%~127.3%,可以满足食用植物油中多种农药残留的同时分析。采用该方法对国内市场常见的食用植物油进行检测分析,所检测的农药残留均在国家标准的限量范围内。

Determination of 23 Kinds of Pesticide Residues in Edible Vegetable Oils by GC-MS

A method was established for the determination of 23 kinds of pesticide residues in edible vegetable oils by gas chromatograghy with mass spectrometry. The sample was extracted with acetonitrile, and the clear suoernant liquid was purified by PSA and C18 for GC-MS analysis by using external standard method. The mass cocentration of 23 kinds of pesticide residues had good linear relationships with the chromatographic peak area in the range of 0.01-1.0 mg/L, the correlation coefficients ranged from 0.997 3 to 0.999 7, and the detection limits were 5-15 μg/kg. The relative standard deviations of the determination results were 2.25%-9.40%(n=6), and the standard addition recoveries were 78.4%-127.3%. The method is well suitable for the analysis of multi-pesticides in edible oils. Common edible oils were determined by this method, and the detection results met the standard requirements.