GC联合GC-MS测定果蔬汁中11种有机磷农药的残留量

摘要

建立了气相色谱仪(GC)与气相色谱质谱联用仪(GC-MS)结合测定果蔬汁中11种有机磷农药残留量的分析方法.优化了样品前处理方法,同时优化了GC与GC-MS分析条件.样品以乙酸乙酯提取,添加氯化钠与无水硫酸镁优化萃取条件,以GCB/PSA小柱净化后供GC和GC-MS分析.该方法简便、快速、准确,11种有机磷农药在0.05~0.4 mg/L范围内,显示了良好的线性关系,相关系数均大于0.995,平均加标回收为81.29%~111.74%,回收实验的相对标准偏差(RSD,n=6)在1.9%~8.6%之间.%An analysis method was established for the determination of 11 kinds of organophosphorus pesticides residues in fruit and vegetable juice by using gas chromatograph(GC) and gas chromatograh-mass spectrometry(GC-MS). The GC and GC-MS analysis conditions and sample preparation methods were optimized. The samples were first extracted with acetate, sodium chloride and anhydrous magnesium sulfate were added to optimize the conditions of extraction, then they were purified by GCB/PSA column and detected by GC and GC-MS. The method is simple, fast and accurate.The results show that there is good linearity in the range of 0.05~0.4 mg/L,the correlation coefficients are higher than 0.995,the recoveries are in the range of 81.29% to 111.74% with the relative standard deviations (RSD,n=6) of the recoveries between 1.9% and 8.6%..