ABSTRACT
Objective To establish a method to determine halogenated alkane hydrocarbon in drinking water with headspace gas chromatography. Methods Halogenated alkane hydrocarbon in the water were extracted by headspace technology, then analyzed with DB-5 capillary column, in the same time, they were determined with GC by controlling the temperature and the speed of nitrogen. The retention time of the peaks was used for qualitative analysis, while external standard method was used for quantitative analysis. Results The linear ranges for dichloromethane, trichloromethane, 1, 1, 1-trichloroethane, 1, 2-dichloroethane, carbon tetrachloride, trichloroethylene, bromodichloromomethane, 1, 1, 2-trichloroethane, dibromochloromethane, tetrachloroethylene, tribromomethane were 0.8-4 024.0, 0.007-33.5, 0.004-19.2, 1.4-6 821.0, 0.002-10.0, 0.005-25.6, 0.002-12.1, 0.1-717.8, 0.005-23.5, 0.002-8.1 and 0.02-87.7 ?g/L. The lowest determination limit were 0.01- 4.1 ?g/L, the rate of recovery were 89.7%-110.0% and RSDs were 2.8%-9.0%. Conclusion This method can efficiently separate and accurately determine 11 kinds of halogenated alkane hydrocarbon in drinking water. It is simple, rapid and sensitive.
ABSTRACT
Objective To establish a test method of dichloromethane,1,1-dichloroethylene,1,2-dichloroethylene,1,2-dichloroethane in drinking water with headspace gas chromatography.Methods Halogenated alkane hydrocarbon in the water was extracted by headspace technique,then analyzed with DB-624 capillary column.In the same time,determined with GC by controlling the temperature.Retention time of the peaks was used for qualitative analysis,while external standard method was used for quantitative analysis.Results The linear ranges for dichloromethane,1,1-dichloroethylene,1,2-dichloroethylene,trans-1,2-dichloroethylene,1,2-dichloroethane were 0.85-168,0.07-12.1,0.40-77.8,0.53-119 and 1.2-265 ?g/L respectively,the determination limits were 0.83,0.07,0.40,0.53 and 1.10?g/L respectively,r≥0.999 5,the rate of recovery were 102.5%-113.8%,and RSDs were 5.5%-11.8%.Conclusion This method is simple,rapid and sensitive,can efficiently separate and accurately determine 5 kinds of halogenated alkane hydrocarbon in the water and only takes 5.2 minutes.
ABSTRACT
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, naphth alene 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/m3 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.