不同水源中钙镁元素的含量及pH测定的对比分析  

Comparison of Calcium and Magnesium Contents and pH Determination in Different Water Sources

作　　者：陈庆典 李海斌[1,2] 任鹏 王澍[1] CEHN Qingdian;LI Haibin;REN Peng;WANG Shu(School of Materials and Chemical Engineering,Anhui Jianzhu University,Hefei 230601,China;Anhui Key Laboratory of Water Pollution Control and Wastewater Resource,Hefei 230601,China)

机构地区：[1]安徽建筑大学材料与化学过程学院,安徽合肥230601 [2]水污染控制与废水资源化安徽省重点实验室,安徽合肥230601

出　　处：《安徽建筑大学学报》2019年第6期95-98,113,共5页Journal of Anhui Jianzhu University

基　　金：安徽建筑大学校级青年基金(No.2017XQZ08);安徽省教育厅一般项目(No.KJ2018JD17);安徽建筑大学开放实验室项目(No.2017kf06)。

摘　　要：为比较市售饮用水、合肥市自来水、易海水(校园湖水)和巢湖水中钙镁元素含量和pH差异,采用原子吸收分光光度计测定了钙镁元素含量。研究结果表明,巢湖水和易海水的钙镁元素总量和硬度均高于合肥市自来水,巢湖水的钙元素含量比合肥市自来水低16.24%,镁元素含量比合肥市自来水高40.65%。而市售饮用水的钙镁元素总量和硬度均低于合肥市自来水,且两项指标分别与合肥市自来水相差30.95~96.03%和1.20~73.05%,说明合肥市自来水的钙元素含量与市售饮用水存在显著差异。pH测试显示合肥市自来水和湖水均显弱酸性,且大小顺序为巢湖水>易海水>合肥市自来水,巢湖水和易海水的pH分别比合肥市自来水高10.19%和6.15%。市售饮用水中包装饮用水pH最高呈中性,饮用天然水pH最低,且前者比后者高4.95%。通过MINTEQ软件计算钙镁元素在水溶液中的分布可知,镁离子比钙离子更容易形成沉淀,且说明钙镁元素含量会影响水体pH变化。In order to compare the difference in calcium and magnesium content and pH of commercially drinking water,Hefei tap water,Yihai water(campus lake water)and Chaohu Lake,the content of calcium and magnesium is determined by atomic absorption spectrometry.The results show that the total amount and hardness of calcium and magnesium in Chaohu Lake and Yihai Water are higher than those in Hefei tap water.The content of calcium in Chaohu Lake is less than that 16.24%,and the content of magnesium is higher 40.65%in Hefei tap water.The total amount and hardness of calcium and magnesium in commercial drinking water are less than that in Hefei tap water.The difference calcium and magnesium are 30.95~96.03% and 1.20~73.05%,respectively.which shows that there is a significant difference in terms the calcium content between Hefei tap water and the commercially drinking water.The pH test shows that Hefei tap water and lake water were weakly acidic,and the order is Chaohu Lake>Yihai water>Hefei tap water.The pH of Chaohu and Yihai water are 10.19%and 6.15%higher than that of Hefei tap water.The pH of packaged drinking water in commercial drinking water is the highest,the natural drinking water is the lowest,and the former is 4.95%higher than the latter.The distribution of calcium and magnesium in aqueous solution by MINTEQ software shows that magnesium ions are more likely to form precipitate than calcium ions,the calcium and magnesium content can affects the pH change of water.

关 键 词：原子吸收光谱 水 PH 钙 镁 

分 类 号：X832[环境科学与工程—环境工程]