论文部分内容阅读
目的采用吹扫捕集-气相色谱-质谱法建立同时测定27种生活饮用水中挥发性有机物的方法,为制定相应的国家标准提供实验参考。方法利用吹扫捕集-气相色谱-质谱法联用技术,全扫描方式(SCAN)进行质谱定性,选择离子(SIM)内标法定量,测定生活饮用水中27种挥发性有机物。通过色谱条件优化,并对吹扫、解吸和烘焙等样品前处理条件的考察,建立了饮用水中27种挥发性有机物的吹扫捕集-气相色谱-质谱法测定方法。结果各待测组分的线性范围在0~40μg/L之间,相关系数r>0.996,相对标准偏差(RSD)在2.85%~13.5%之间,样品平均加标回收率为91.5%~117.3%,检出限为0.04μg/L~0.50μg/L,定量限为0.14μg/L~1.7μg/L。结论该方法简单快捷,灵敏度高,回收率好,各分析组分之间无干扰,且用于实际水样的检测结果令人满意,适用于27种生活饮用水中挥发性有机物的同时检测。
Objective To establish a method for the simultaneous determination of 27 volatile organic compounds in drinking water by purge and trap - gas chromatography - mass spectrometry (GC-MS), and to provide experimental references for the development of corresponding national standards. Methods A total of 27 volatile organic compounds (VOCs) in drinking water samples were determined by mass spectrometry (SCAN) and internal standard method of selective ion (SIM) with the combination of purge and trap - gas chromatography - mass spectrometry. Through the optimization of chromatographic conditions and the investigation of pretreatment conditions such as purge, desorption and baking, the determination of 27 volatile organic compounds in drinking water by gas chromatography-mass spectrometry was established. Results The linear range of the tested components was between 0 and 40 μg / L with a correlation coefficient of r> 0.996 and the relative standard deviations (RSDs) ranged from 2.85% to 13.5%. The mean spike recoveries were 91.5% to 117.3 %, The detection limit was 0.04μg / L ~ 0.50μg / L, the limit of quantification was 0.14μg / L ~ 1.7μg / L. Conclusion The method is simple, rapid, sensitive, and has good recovery rate and no interference among the analytical components. The results of the method are satisfactory for real samples and suitable for the simultaneous detection of volatile organic compounds in 27 kinds of drinking water.