生活饮用水中10种卤代乙酰胺的全自动固相萃取-气相色谱测定方法研究

建立了全自动固相萃取-气相色谱测定生活饮用水中10种卤代乙酰胺(HAcAms)的方法。10 mL水样在全自动固相萃取仪上用PPL柱萃取净化,经真空冷冻离心浓缩,气相色谱-电子捕获检测器检测。优化并考察了影响萃取效率的各项参数,如固相萃取柱的选择、萃取剂的种类与用量等。在最佳实验条件下,在0.5~150μg/L线性范围内10种HAcAms线性关系良好,其相关系数均大于0.997。方法的检出限为2~3 ng/L,定量限为5~10 ng/L,加标回收率为72.4%~108.5%,RSD为3.3%~9.1%。方法所需的样品量及试剂少、重复性好,可用于生活饮用水中10种卤代乙酰胺的测定。

Determination of 10 Haloacetamides in Drinking Water by Gas Chromatography Based on Automated Solid Phase Extraction

To establish a gas chromatography method for determination of 10 haloacetamides in drinking water based on automated solid phase extraction,10 mL of water sample was extracted by automatic solid phase extraction instrument with a PPL sorbent,then concentrated by vacuum freezing centrifugation,and detected by gas chromatography-electron capture detector.The parameters affecting extraction efficiency,such as the selection of solid phase extraction column,the types and dosages of extractants and impurity removers were optimized and investigated.Under the optimum experimental conditions,the regression equation of the 10 haloacetamides in the range of 0.5~150 μg/L was good and the correlation coefficient were all greater than 0.997.The limits of detection for the method were 2~3 ng/L,the quantification limits of the method were 5~10 ng/L,the average recovery rates were 72.4%~108.5% and the relative standard deviations were 3.3%~9.1% respectively.The method which required fewer samples and reagents with good reproducibility,can be used for the determination of 10 haloacetamides in drinking water.