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目的探讨2010—2013年上海市闵行区不同水文期生活饮用水中三氯甲烷(CHCl3)和四氯化碳(CCl4)2种挥发性卤代烃(THMs)含量的变化趋势,为改善饮用水质量提供科学依据。方法分别采集2010—2013年闵行区不同水文期(枯水期、丰水期、平水期)出厂水、管网水、二次供水水样,用顶空-气相色谱法测定CHCl3、CCl4,保留时间定性,峰面积定量。结果共采集水样930份,利用方差分析比较2种THMs在不同年份、水文期和水样类型中的差异,CHCl3的含量在不同年份(F=6.43,P<0.01)、不同水文期(F=40.4,P<0.01)、不同水样类型(F=23.66,P<0.01)的差异均有统计学意义。CCl4的含量在不同年份差异无统计学意义(F=1.819,P>0.05),在不同水文期(F=8.42,P<0.01)和不同水样类型(F=5.93,P<0.01)的差异均有统计学意义。结论闵行区生活饮用水中CHCl3含量逐年升高,CCl4变化趋势不显著;CHCl3在不同水文期的含量比较为丰水期>平水期>枯水期,CCl4含量在丰水期最高,平水期和枯水期差异无统计学意义。CHCl3在不同水样中含量比较为出厂水>二次供水>管网水,CCl4含量为二次供水>管网水>出厂水。
Objective To explore the trend of volatile organic compounds (THMs) content of trichloromethane (CHCl3) and carbon tetrachloride (CCl4) in drinking water of different hydrological periods in Minhang district of Shanghai from 2010 to 2013, Quality to provide a scientific basis. Methods The water samples of factory water, pipe network and secondary water supply in different hydrological periods (dry season, wet season and flat-out period) from 2010 to 2013 in Minhang district were collected. The qualitative and quantitative analysis of CHCl3 and CCl4 were carried out by headspace-gas chromatography , Peak area quantitative. Results A total of 930 water samples were collected. The variance analysis was used to compare the differences of the two kinds of THMs in different years, hydrological periods and water samples. The content of CHCl3 in different years (F = 6.43, P <0.01) = 40.4, P <0.01). The differences among different water samples (F = 23.66, P <0.01) were statistically significant. There was no significant difference in the content of CCl4 in different years (F = 1.819, P> 0.05). The difference of CCl4 content in different water samples (F = 8.42, P <0.01) All have statistical significance. Conclusions The content of CHCl3 in drinking water of Minhang District increased year by year with no obvious change trend of CCl4. The content of CHCl3 in different hydrological periods was in the period of wet season> flat water period> dry season, and the content of CCl4 was the highest in wet season, while the difference between flat water and dry season No statistical significance. CHCl3 content in different water samples for the factory water> secondary water supply> pipe network water, CCl4 content of secondary water supply> pipe network water> factory water.