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目的探讨过夜自来水初流水微量元素含量变化。方法采集自铸铁及镀铬两种水龙头流出的过夜自来水 (贮存于镀锌供水铁管10h)的初流水和中段水 ,采用原子吸收分光光度法测定铜、锰、铁、锌含量 ,并分析了其变化趋势与出水量的关系。结果自两种水龙头流出的过夜自来水初流水和中段水铜锰含量无显著变化 ,且均符合生活饮用水标准。铸铁水龙头初流水铁含量以及镀铬水龙头初流水锌含量均高于相应中段水 ,且均超过生活饮用水标准 ,其变化均与出水量呈负相关 (rZn= -0.938 ,rFe= -0.936 ,P均<0.01)。出水3L时 ,铁锌含量基本符合生活饮用水标准。结论水龙头材质影响初流水铁锌含量 ,约3L的初流水不宜饮用 ,建议采用更卫生安全的供水管材和水龙头。
Objective To investigate the changes of trace elements in the first-run water of overnight tap water. Methods The raw water and middle water of overnight tap water (stored in galvanized water supply iron pipe 10h) from cast iron and chrome plated faucets were collected. The contents of copper, manganese, iron and zinc were determined by atomic absorption spectrophotometry The trend of change and the relationship between the amount of water. Results There was no significant change in the content of Cu and Mn in the tap water from the two faucets, and all of them met the standard of domestic drinking water. The iron content in the initial flow of the cast iron faucet and the zinc content in the primary flow of the chromed faucet were higher than those in the corresponding middle stage and all exceeded the standard of drinking water. The changes were negatively correlated with the water discharge (rZn = -0.938, rFe = -0.936, P <0.01). 3L effluent, iron and zinc content basically meet drinking water standards. Conclusion The faucet material affects the initial iron and zinc content of water, about 3L of the initial flow of water should not be drinking, it is recommended to adopt a more sanitary and safe water supply pipes and faucets.