空气中苯系物及卤代烷烃化合物的毛细管气相色谱测定法

目的 探讨二硫化碳解吸-毛细管气相色谱法测定工作场所空气中苯系物及卤代烷烃的检测方法.方法 工作场所空气中的苯系物及卤代烷烃经活性炭管采集,二硫化碳解吸后,注入带氢火焰离子化检测器(FID)的气相色谱仪进行分析,以保留时间定性,峰面积定量.结果 苯、甲苯、对二甲苯、间二甲苯、邻二甲苯、乙苯、苯乙烯、四氯化碳、三氯甲烷、1,2-二氯乙烷的线性范围分别为0.019～81.600、0.018～91.200、0.018～88.800、0.018～56.800、0.011～92.000、0.012～63.200、0.018～93.200、0.449～2 298.400、0.252～1 287.000、0.076～390.000 mg/m3,回收率为88.4%～98.1%,RSD为1.0%～6.0%.结论 该方法能够有效分离和准确测定空气中苯系物及卤代烷烃化合物,具有较好的精密度与准确度,适合现场空气中该类化合物的测定.

Determination of VOCs in Air with Capillary Gas Chromatography

Objective To develop a method of determining benzene hydrocarbon and halogenated alkane hydrocarbon in the air of workplaces with the capillary gas chromatography of carbon disulphide desorption. Methods Benzene hydrocarbon and halogenated alkane hydrocarbon in the air of workplace were collected by active carbon sampling cuvette, then separated by hydrogen flames detector gas chromatography machine after carbon disulphide desorption. Benzene hydrocarbon and halogenated alkane hydrocarbon were determined quantitively by retention time and quantitatively by apex area. Results The linear ranges of benzene, toluene, p-xylene, m- xylene, o-xylene, ethyl benzene, styenl, chlorobenzene, acetone, carbontetrachloride, dichloromethanl, trichloromethane, 1, 2- dichloroethane, naphthalene were 0.019-81.600, 0.018-91.200, 0.018-88.800, 0.018-56.8, 0.011-92.000, 0.012-63.200, 0.018- 93.200, 0.449-2298.400, 0.252-1287.000 and 0.076-390.000 mg/m^3 respectively. The recovery rates were 88.4%-98.6% and RSD were 1.0%-6.0%, Conclusion This method can separate efficiently and determine accurately benzene hydrocarbon and halogenated alkane hydrocarbon in the air with a good precision. It is suitable for the determination of the toxicants in the air.