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目的建立饮用水中马拉硫磷的快速溶剂萃取-气相色谱测定法。方法取样量为25 ml,静态萃取2次,萃取时间为6 min,溶剂为二氯甲烷-石油醚-丙酮(体积比为3∶1∶1),无水硫酸钠使用量为20 g。HP-5毛细管柱(30 m×0.32mm,0.25μm),分流比为1∶5,进行气相色谱测定。结果在1.0～500.0μg/L线性范围内,所得回归方程为y=0.114 6x+0.015 3,r=0.999 6,呈较好的线性关系。该方法的检出限、定量下限分别为0.05、1.04μg/L,平均回收率在98.3%～100.9%之间,RSD在0.36%～4.23%之间。结论该方法操作简捷,准确度和精密度均较高,可节约试剂,降低环境污染,适用于饮用水中马拉硫磷的测定。
Objective To establish a rapid solvent extraction - gas chromatography method for the determination of malathion in drinking water. Methods The volume of sample was 25 ml. The extraction time was 6 min. The solvent was dichloromethane - petroleum ether - acetone (3:1:1), and the amount of anhydrous sodium sulfate was 20 g. HP-5 capillary column (30 m × 0.32 mm, 0.25 μm) with a split ratio of 1: 5 for gas chromatography. The results showed that in the linear range of 1.0 ~ 500.0μg / L, the regression equation was y = 0.114 6x + 0.015 3, r = 0.999 6, showing a good linear relationship. The detection limit and lower limit of quantitation of this method were 0.05, 1.04 μg / L, respectively. The average recoveries ranged from 98.3% to 100.9% with RSD ranging from 0.36% to 4.23%. Conclusion The method has the advantages of simple operation, high accuracy and precision, saving reagents and reducing environmental pollution, and is suitable for the determination of malathion in drinking water.