建立了同时测定饮用水源水中24种挥发性有机物(VOCs)的顶空固相微萃取-气相色谱-质谱法.用75 μm CarboxenTM-Polydimethylsiloxane(CAR-PDMS)固相微萃取柱顶空萃取水样中的VOCs,VOCs用气相色谱-质谱联用仪检测,采用内标法定量.对萃取柱涂层、样品盐度、萃取温度和萃取时间等样品前处理条件进行了优化,VOCs的检出限在0.03～0.31 μg/L之间,线性相关系数r＞0.996(二氯甲烷和三氯甲烷除外).对饮用水源水实际水样0.50μg/L和1.00 μg/L两个加标浓度水平的回收率进行了测定,三氯甲烷回收率均值分别为104％和142％,其余VOCs回收率分别为90.0％～120％和88.0％～110％,除二氯甲烷和三氯甲烷外,其余VOCs测定结果的相对标准偏差均小于15.0％(n=6).该方法适用于饮用水源水中挥发性有机物的监测分析.%Head space solid phase microextraction (HS-SPME) method was developed to determinate 24 volatile organic compounds(VOCs) in drinking source water. 75 μm Carboxen?-Polydimethylsiloxane(CAR-PDMS) fiber was used to extract VOCs in samples, and VOCs were detected by gas chromatography and mass spectrometry(GC-MS) with selective ion mass (SIM) mode and internal standard quantitative method. The selection of SPME coatings, addition of NaCl, extraction temperature and extraction time were optimized. The detection limits were 0.03-0.31 μg / L and the correlation coefficients were more than 0.996 (except for dichloromethane and chloroform). The average values of recoveries obtained were 90.0%-120% and 88.0%-110%, RSD of detection results were less than 15.0%(except for dichloromethane and chloroform) in drinking source water samples spiked with 0.50 μg/L and 1.00 μg/L VOCs(n=6). HS-SPME method is capable to the determination of 24 VOCs in drinking source water sample.
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