SPE-GCMS法分析饮用水源水中痕量半挥发性有机物

采用C 18固相萃取柱富集,乙酸乙酯、二氯甲烷和丙酮混合溶剂以1∶1∶1比例洗脱、自动固相萃取的前处理方法,气相色谱质谱连用,分析水源水中33种半挥发性有机物,并与液液萃取前处理方法进行比较。结果表明:在500~5 000μg/L范围内,33种SVOC线性良好,相关系数0.990,回收率为70.1%~114.2%,相对标准偏差为2.4%~13.4%,方法检出限为0.06~0.25μg/L;而且该方法较液液萃取,检出样品种类多。适用于饮用水源水中半挥发性有机物的监测。

Analysis of Trace Semi-volatile Organic Compounds from Drinking Source Water Using SPE-GCMS Technique

A GCMS method was established for detecting 33 trace semi-volatile organic compounds (SVOCs) in drinking source wa-ter.Samples were treated with C18 automated solid phase extraction ( SPE) and eluted by a mixed solvent of CH2 Cl2 , ethyl acetate and acetone.This method was compared with the liquid-liquid extraction ( LLE) pretreatment method.The results showed that good linearity was obtained in the range of 500~5 000μg/L for 33 SVOC with the correlation coefficient higher than 0.990.The recovery was between 70.1%and 114.2%.The relative standard deviation was between 2.4%and 13.4%.The method detection limit was between 0.06 and 0.25 μg/L.Compared with LLE, this method could detect more kinds of samples.It was suitable for monitoring SVOC in drinking water.