顶空色谱法分析水中多种挥发性有机物

Determination of multiple VOCs in drinking water with headspace gas chromatography

目的：探讨生活饮用水中多种挥发性有机物的顶空气相色谱（HE-GC）测定方法[1,2]。方法：水中微量挥发性有机物经顶空系统提取后,应用HP-5毛细管色谱柱,采用程序升温方式进行气相色谱分析,以保留时间定性,外标法定量。结果：1,1,1-三氯乙烷、二氯甲烷、苯、三氯乙烯、四氯乙烯、甲苯、1,2-二氯乙烷、乙苯、对二甲苯、间二甲苯、邻二甲苯、苯乙烯的线性范围分别为：25.36-1536.00、24.18-2418.00、2.93-293.48、25.71-2571.00、32.64-3264.00、4.07-407.28、24.22-2422.00、4.28-427.64、4.19-418.80、3.41-341.20、4.24-423.60、4.82-481.64μg/L;最低检出浓度为：0.26-8.52μg/L;水样加标回收率为：89.2%-110.3%;RSD为：2.4%-5.7%。结论：该方法一次性完成饮用水中多种挥发性有机物的分离和测定,分析时间仅为15min,操作简便、灵敏,适合饮用水中挥发性有机物的分析测定。

Objective：A method for determination of multiple VOCs in drinking water by headspace gas chromatography was explored. Methods：Multiple VOCs in the water which were extracted by headspace technology was determinated by programming temperature GC with HP - 5 capillary column. The retention time of the peaks was used for qualitative analysis; external standard method was used for quantitative analysis. Results： The linear ranges of 1,1,1 - trichloroethane, dichloromethane, benzene, trichloroethylene, tetrachloroethylene, toluene, 1, 2 - dichloroethane, ethyl benzene, p - xylene, m - xylene, o - xylene, styrene were 25.36 - 1536. 00,24. 18 -2418. 00,2. 93 - 293. 48 ,25. 71 -2571. 00,32. 64 -3264. 00,4. 07 -407. 28,24. 22 - 2422.00, 4. 28 ~ 427. 64,4. 19 -418. 80,3. 41 - 341.20,4. 24 - 423.60,4. 82 -481.64 ixg/L, respectively. The lowest determination limit was 0. 26 -8. 52 μg/L; the rate of recovery was 89. 2% - 110. 3%, and RSD were 2.4% -5.7%. Conclusion：The method is simple, rapid, sensitive and can efficiently separate and accurately determine multiple VOCs in drinking water. The total analysis time is only 15 min.