吹扫捕集/气相色谱-质谱联用法测定水中环氧氯丙烷

Determination of Epichlorohydrin in Water by Purge and Trap/Gas Chromatography-Mass Spectrometry

建立吹扫捕集/气相色谱-质谱法(GC-MS)测定水中环氧氯丙烷的方法。通过对吹扫捕集条件进行调整,讨论吹扫温度和吹扫时间、解吸温度和解吸时间对吹扫捕集效率的影响,确定最佳吹扫捕集条件。结果表明,在最佳条件下,环氧氯丙烷的线性相关系数为0.999 9,平均加标回收率为99.7%,相对标准偏差为3.0%;方法检出限为0.10μg/L。该方法与国家标准方法相比,操作简便、检出限低、准确度和精密度高,适用于地表水和生活饮用水中环氧氯丙烷的分析测定。

A method for determination of epichlorohydrin was established based on purge and trap / gas chromatography mass spectrometry. The purge temperature, purge time, desorption temperature and desorption time were adjusted ,the efficiency of purge and trap affected by purge and trap conditions was analyzed, and the best purge and trap condition were determined. Under the optimized conditions, the correlation coefficients of epichlorohydrin were 0.999 9, the average recoveries were 99.7%, and the relative standard deviations of method were 3.0%; the detection limits of method were 0.10 μg/L. Compared with the national standard method, this method takes advantages of easy to operation, the linear relations, accuracy and precision were well. The method can meet the requirements for the determination of epichlorohydrin in surface water and drinking water.