Development of a Headspace capillary column gas chromatography method for the determination of trihalomethanes in drinking water
Objective To establish a headspace capillary column gas chromatography method for the determination of tri-halomethanes in drinking water.Methods Drinking water samples in the headspace bottle were analyzed for four compounds of trihalomethanes with specific parameters,including temperature of top-empty sampler heating box(70℃),quantitative ring(80 ℃),a transmission line(90 ℃),gas chromatograph sampling port(250℃),column temperature(110 ℃),and detector(250 ℃).Other parameters employed were balance time(30 minutes),shunt ratio(10:1),and column flow rate(2.0 mL/min).Results The DB-624UI capillary chromatography columns was used to achieve detection limits of 0.081 μg/L for trichloromethane,0.045 µg/L for dichlorodibromomethane,0.048 μg/L for monochlorodibromomethane,and 0.123 μg/L for tribromomethane.The linear corre-lation coefficient ranged from 0.999 8 to 0.999 9,precision test of relative standard deviation(RSD)was between 1.27％and 2.38％,and the standard recovery rates were between 91.7％and 109.8％.Conclusions This method offers a simple and sensi-tive approach to analyze trihalomethanes in drinking water,with advantages such as fast analysis speed,low detection limit,high precision,and high accuracy.It is well-suited for use in grassroots laboratories and has significant potential for promotion and application.
Drinking waterTrihalomethanesHeadspaceCapillary column gas chromatography
NETL
NSTL
万方数据
