饮用水和茶水中无机阴离子含量调查

The Investigation of Inorganic Anions Concentration in Drinking Water and Tea

采用离子色谱法检测了5种多次煮沸后的饮用水中五种阴离子(F^-,Cl^-,NO_2^-,NO_3^-,SO_4^(2-))含量变化。并对茶水中阴离子含量进行检测,探讨茶水放置时间与水中阴离子含量之间的关系。结果显示:所有水样均未检出亚硝酸根离子;5种饮用水反复煮沸后,各阴离子含量均没有出现明显的增加趋势;随着冲泡时间的增加,茶水中的阴离子仅F-有较明显的增加趋势。浓茶中阴离子含量明显高于淡茶,红茶中阴离子含量明显高于绿茶。反复煮沸的白开水和长时间放置的茶水中的五种阴离子含量均符合《生活饮用水卫生标准》(GB 5749-2006)。

Ion chromatography was used to detect the content of five kinds of anions（F-, Cl-, NO2-, NO3-, SO4（2-）） in five kinds of repeated boiling water and long time steeping tea. The results showed that NO2- was not detected in all of the water samples. The anion content in five repeated boiling drinking waters had no significant increasing trend. Only F- increased obviously with the increasing brewing time in tea. The anion content of strong tea was significantly higher than that of light tea and the anion content of black tea was significantly higher than that of green tea. The content of five kind of anion in repeated boiling water and long time steeping tea are in accord with the National Hygienic Standard for Drinking Water（ GB 5749-2006）.