GC-ECD法快速测定饮用水中卤乙酸的方法研究

Study on rapid determination of HAAs in drinking water using GC-ECD

通过优化卤乙酸衍生化条件、改进色谱条件，建立了一种利用短程色谱柱快速测 定饮用水中5种卤乙酸的GC-ECD方法。方法的特点是色谱程序简单、运行时间短，色谱运行时间仅为10．8min，远少于通常的运行时间。方法的检出限较低，精密度较好，除MCAA外，MBAA、DCAA、TCAA和DBAA的检出限和相对标准偏差分别小于0．46μg／L和4％（n=7）；5种卤乙酸的加标回收率在86．6％～109．3％之间，满足EPA 6251B标准方法的要求。

With the gas chromatography （GC） coupled with short capillary column and electron capture detector （ECD）, a simple and rapid method for the determination of five haloacetic acids （HAAs） in drinking water was developed by optimization of methylation conditions and modification of gas chromatographic program. The major advantages of the method were the simplicity of chromatographic temperature program and short GC run time. The GC run time of 10.7 min was shorter than usually used GC run time. The method detection limit （MDL） and relative standard deviation （RSD） were less than 0.46 μg/L and 4% （ n = 7） respectively, except MCAA. The spiking recovery of five HAAs, ranged from 86.6% to 109.3%, complied with the requirement of standard method 6251B. The experiment results proved that the accuracy and precision were good.