吹扫捕集-气质联用法测定天然饮用水中挥发性有机物

采用吹扫捕集-气相色谱/质谱联用法,测定天然饮用水中35种挥发性有机化合物,包括三卤甲烷、卤代苯类、苯系物以及多环芳烃类等。方法检出限范围为0.05～0.17μg/L,35种有机物加标5μg/L测定回收率为86.5%～113%,RSD(n=6)为1.6%～6.1%。调研了市售的44个瓶装天然饮用水和5个水源水样品:瓶装天然饮用水中检出1,2-二氯乙烷、一氯二溴甲烷、二氯一溴甲烷、三溴甲烷、苯、三氯甲烷、1,2,4-三甲苯、甲苯共8个化合物,其中三氯甲烷的检出率达到49%,但检测结果均在相关标准的限量要求范围内;水源水样品中均未测得挥发性有机化合物。

Determination of volatile organic compounds in natural drinking water by purge and trap-gas chromatography/mass Spectrometry

A purge and trap(P&T) method coupled with gas chromatography/mass spectrometry has been developed for the determination of 35 volatile organic compounds(VOCs) in natural drinking water,including Trihalomethan,Halogenated benzene,Benzene,Toluene,Ethylbenzene,and Xylenes(BTEX),Polycyclic aromatic hydrocarbons.The threshold were ranged from 0.05 to 0.17 μg/L,the recoveries of the 35 compounds spiked at 5 μg/L were between 86.5% and 113% with RSD(n=6) 1.6%~6.1%.There were 44 samples from markets and 5 samples from water source collected and analyzed.There were 8 compounds including 1,2-dichloroethane,chlorodibromomethane,bromodichloromethane,bromoform,benzene,chloroform,1,2,4-trimethylbenzene,toluene detected from the water samples,the detectable rate of chloroform were 49%.All concentration results obtained were within the requirements of relevant regulation value.None of VOCs was detected from the samples.