吹扫捕集-气质联用法测定饮用水中22项挥发性有机物

Determination of 22 VOCs in Drinking Water by Purge-Trap and GC-MS Method

论述一种利用吹扫捕集-气质联用测定饮用水中22项挥发性有机物浓度的方法。通过将全过程扫描模式和单离子扫描模式相结合,精确定性并定量了生活饮用水中氯乙烯、1,1-二氯乙烯、二氯甲烷、反-1,2-二氯乙烯、顺-1,2-二氯乙烯、1,1,1-三氯乙烷、苯、1,2-二氯乙烷、三氯乙烯、甲苯、四氯乙烯、氯苯、乙苯、间/对二甲苯、邻二甲苯、苯乙烯、1,4-二氯苯、1,2-二氯苯、1,3,5-三氯苯、1,2,4-三氯苯、六氯丁二烯、1,2,3-三氯苯这22项有机物。分析可知,各有机物在0.2~10μg/L时的最低检出限、精密度、回收率均优于国家标准对饮用水中的挥发性有机物的检测要求。

A method is discussed to determine the concentration of 22 volatile organic compounds(VOCs)in drinking water by purgetrap coupled with gas chromatography.Combining full scan mode with single ion scan mode,the 22 VOCs in drinking water which consist of vinyl chloride,1,1-dichloroethylene,methylene chloride,trans-1,2-dichloroethylene,cis-1,2-dichloroethylene,1,1,1-trichloroethane,benzene,1,2-dichloroethane,trichloroethylene,toluene,tetrachloroethylene,chlorobenzene,ethylbenzene,m/p-xylene,o-xylene,styrene,1,4-dichlorobenzene,1,2-dichlorobenzene,1,3,5-trichlorobenzene,1,2,4-trichlorobenzene,hexachlorobutadiene and 1,2,3-trichlorobenzene can be accurately determined and quantified.The results show that the minimum detection limit,precision and recovery rate of each organic substance in the concentration range of 0.2~10μg/L are better than those in the national standard for the detection of VOCs in drinking water.