南充市饮用水挥发性卤代烃污染水平研究

A Study on the Levels of Volatile Halogenated Hydrocarbon in Drinking Water in Nanchong

为了解南充市饮用水挥发性卤代烃（ＶＨＨ）污染水平，于１９９２～１９９８年采集市政供水和自备集中式供水样１２８件，以气相色谱法分析氯仿（ＣＨＣｌ３）和四氯化碳（ＣＣｌ４）含量。结果表明全部水样均检出ＣＨＣｌ３（０．０６～２２．１３μｇ／Ｌ）和ＣＣｌ４（０．０２～２．５μｇ／Ｌ）。管网水ＶＨＨ含量（４．４５μｇ／Ｌ）为源水（２．５２μｇ／Ｌ）的１．８倍，地面水（３．７２μｇ／Ｌ）为地下水（２．９６μｇ／Ｌ）的１．３倍，出厂水（４．０９μｇ／Ｌ）为地面水（２．２８μｇ／Ｌ）的１．８倍。自备供水（４．９５μｇ／Ｌ）为市政供水（１．２８μｇ／Ｌ）的３．９倍，自来水丰水期（３．８１μｇ／Ｌ）为枯水期（３．２３μｇ／Ｌ）的１．２倍。与国内和其它国家、地区的检测结果相比，该市饮用水中ＣＨＣｌ３含量处于较低水平。

In order to explore the levels of volatile halogenated hydocarbon(VHH)in drinking water in Nanchong,the levels of chloroform(CHCl3) and carbon tetrachloride(CCl4) in 128 samples collected from the municipal water supply and selfprovided centralized water supply system were determined with gas chromatography during 1992￣1998.The results showed that CHCl3 (006￣2213 g/L) and CCl4(0.02￣2.5 g/L)were found in all the samples.The levels of VHH in pipeline network water(445 g/L) were 18 times of those in source water(252 g/L)in surfaee water (372 g/L) the levels of VHH were 13 times of those in underground water (296 g/L) in selfprovided centralized supply VHH concentrations water(495 g/L)were 39 times of those in municipal water supply (128 g/L),in plentiful water period VHH concentration of tap water were 12 times of those in low water period(323 g/L).In this city,the levels of CHCl3 in drivking water were lower compared with the reports come from China and abroad.