Comparison And Study Of Analytical Approach For Volatile Halohydrocarbons In Water

Water is one of the most important factors human depends on. In 1974 American scientists Rook and Bellar discovered that the concentration of THMs raises strikingly after chlorination of source water, and toxicology tests prove THMs to be carcinogenesis, aberrationesis and mutagenesis, consequently they are harmful to people's health. As a result, analysts in different countries show great concerns to halohydrocarbons-the major byproducts of chlorination disinfection in tap water.In this paper, firstly the effects on atmospheric environment and human health of volatile halohydrocarbons (VHCs) are described. Then reviewing their sources, occurrence and environmental quality criteria in water. Thirdly summarizing 3 pretreatment methods-liquid-liquid extraction, headspace and purge and trap for determination of VHCs in water by gas chromatography and presenting their recent progress.On the basis of methods people have used establishing one method with PAT-GC/ECD to analyze 6 kinds of VHCs, and determinating them in tap water, in river water and in lake water quantitatively.It is shown in the result that CHC13, C2HC13 and CHBr2Cl are mainly produced by disinfection of chlorination and their concentration in natural water is very low compared to tap water. Moreover, evaluating the effects of different factors such as laying up unaffectedly, temperature.