建立测定生活饮用水中三卤甲烷的顶空毛细管柱气相色谱方法
Development of a Headspace capillary column gas chromatography method for the determination of trihalomethanes in drinking water
肖东民 1路菊梅1
作者信息
- 1. 巢湖市疾病预防控制中心检验科,安徽巢湖 238000
- 折叠
摘要
目的 建立饮用水中三卤甲烷的顶空毛细管柱气相色谱测定方法.方法 测定顶空瓶中生活饮用水样本中4种三卤甲烷类化合物进行分析,并确定其具体参数,包括顶空进样器加热箱(70℃)、定量环(80℃)、传输线(90℃)、气相色谱仪进样口(250℃)、柱温(110 ℃)、检测器(250℃).其它参数包括平衡时间(30 min),分流比(10∶1)和色谱柱流量(2.0mUmin).结果 选用DB-624UI毛细管色谱柱,三氯甲烷(CHC13)、二氯一溴甲烷(CHBrCl2)、一氯二溴甲烷(CHBr2Cl)和三溴甲烷(CHBr3)的检出限分别为0.081、0.045、0.048和0.123 μg/L,线性相关系数为0.999 8～0.999 9,精密度试验相对偏差(RSD)为1.27％～2.38％,加标回收率为91.7％～109.8％.结论 该方法分析速度快、检出限低、精密度及准确度高,为饮用水中三卤甲烷的分析提供了一种操作简单、灵敏的方法,非常适合在基层实验室应用,具有很好的推广应用价值.
Abstract
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.
关键词
生活饮用水/三卤甲烷/顶空/毛细管柱气相色谱法Key words
Drinking water/Trihalomethanes/Headspace/Capillary column gas chromatography引用本文复制引用
出版年
2024
NETL
NSTL
万方数据