摘要
目的建立同时测定饮用水中55种挥发性有机物(VOCs)的吹扫捕集-气相色谱/质谱联用检测的方法(P&TGC/MS)。方法利用吹扫捕集技术,水中55种挥发性有机物经DB-624毛细管色谱柱,程序升温分离,质谱定性,内标法定量。对吹扫捕集条件(吹扫流量、吹扫时间、解析时间、解析温度、烘焙时间等)、色谱条件、进样口方式、质谱采集方式等进行优化,并对实际水样进行分析。结果 55种挥发性有机物在0.5μg/L^40μg/L浓度范围内的线性相关系数为0.9920~0.9999,检出限(LOD)为0.004μg/L^0.04μg/L,相对标准偏差(RSD)范围在5%~12%(n=9),加标回收率在92%~111%。结论本法缩短了分析周期,实现了一次进样多组分同时分析,准确度和灵敏度高,精密度好,线性范围宽,可满足生活饮用水中55种挥发性有机物的同时测定。
Objective To establish a method to determine 55 kinds of volatile organic compounds（ VOCs） in drinking water by gas chromatography- mass spectrometry with puffing and trapping method（ PT- GC /MS） simultaneously. Methods 55 kinds of volatile organic compounds（ VOCs） in drinking water were separated with DB- 624 capillary column with temperature programming,detected by gas chromatography mass spectrometry using purge and trap,and quantified with internal standards.The puffiing and trapping conditions（ purge flow and time,trap temperature and time,baking temperature）,separation conditions,the mode of injection and mass spectrum acquisition are all discussed systematically. Results The linear range of VOCs was 0. 5 μg /L to 40 μg /L（ r = 0. 9920 ~ 0. 9999）. The detection limit was 0. 004 μg /L to 0. 04 μg /L. The relative standard deviation was 5% to 12%（ n = 9）. The spiked recoveries were in the range of 92% ~ 111%. Conclusion The method could be simultaneously detect multiple components with single injection,and also shorten the analytical cycle greatly. It was accurate and high sensitive,good exactitude and wide linear range. Besides,it can meet the needs of determination of 55 kinds of volatile organic compounds in drinking water.
出处
《中国卫生检验杂志》
北大核心
2014年第18期2604-2608,共5页
Chinese Journal of Health Laboratory Technology
基金
衢州市科技计划项目(2013J062)
