吹扫捕集-气相色谱法测定水中乙醛、丙烯醛和丙烯腈的研究

Determination of Acetaldehyde,Acrolein and Acrylonitrile in Water by Purge Trapping and Gas Chromatography

建立了吹扫捕集-气相色谱法测定水中乙醛、丙烯醛和丙烯腈的分析方法,并对吹扫时间、温度、流速以及解析时间进行了优化。在优化条件下绘制工作曲线,对方法检出限、正确度和精密度进行实验。结果表明,乙醛、丙烯醛和丙烯腈的工作曲线线性相关系数均≥0.9998,检出限均为0.003 mg/L、测定下限均为0.012 mg/L,加标回收率分别为88.6%~119%、98.2%~118%、94.2%~119%,相对标准偏差分别为1.8%~9.6%、1.7%~5.3%、1.4%~4.7%。该方法前处理简单、分离效果好、检出限低、灵敏度高、正确度高、精密度好、目标组分线性相关性好,且不需要使用有机溶剂,对环境的污染和实验人员的伤害小,能满足《地表水环境质量标准》(GB 3838-2002)[1]和《生活饮用水卫生标准》(GB 5749-2022)[2]中的相关要求,可以用于地表水、生活饮用水中乙醛、丙烯醛和丙烯腈的测定。

A purging-catch-gas chromatography method was developed for the determination of acetaldehyde,acrolein and acrylonitrile in water.The purging time,temperature,flow rate and resolution time were optimized.The working curve is drawn under optimized conditions,and the detection limit,accuracy and precision of the method are tested.The results showed that the linear correlation coefficients of acetaldehyde,acrylein and acrylonitrile were all greater than or equal to 0.9998,the detection limits were 0.003 mg/L,the determination limits were 0.012mg/L,and the recoveries were 88.6%~119%,98.2%~118%,94.2%~119%,respectively.The relative standard deviations were 1.8%~9.6%,1.7%~5.3%and 1.4%~4.7%,respectively.The method has the advantages of simple pre-treatment,good separation effect,low detection limit,high sensitivity,high accuracy,good precision,good linear correlation of target components,no need to use organic solvents,and little harm to environmental pollution and experimental personnel.It can meet the relevant requirements in the“surface water Environmental Quality Standard”(GB 3838-2002)[1]and the“Drinking water Sanitation Standard”(GB 5749-2022)[2],and can be used for the determination of acetaldehyde,alledehyde and acrylonitrile in surface water and drinking water.