火焰原子吸收光谱法对饮用水总硬度的测定

Determination of Total Hardness of Drinking Water by Flame Atomic Absorption Spectrometry

目的：为确定用水质量和进行水处理提供理论依据,测定昆明寻甸和曲靖师宗自来水、井水和山泉水中钙镁元素的含量,并计算水的总硬度。方法：以火焰原子吸收法测定饮用水的总硬度,并与国家标准方法（GB 5750-1985）进行比较。结果：该方法钙的线性范围为0.25-12mg/L,检出限为0.9877mg/L,RSD在1.24%-3.95%之间,回收率为83.05%-100.55%;镁的线性范围为0.01-0.8mg/L,检出限为0.0051mg/L,RSD在1.14%-3.85%之间,回收率为82.7%-100.25%。与国家标准方法相比,无显著性差异。所测水样的硬度均符合国家饮用水硬度标准。山泉水硬度最低,自来水次之,井水最高。结论：火焰原子吸收法快速、准确、简便,适用于饮用水总硬度的测定。

Objective：In order to determine the water quality and provide theoretical basis for water treatment,Ca and Mg elements contents were determined and turned the results to total hardness. Method：Comparing with the national standard method（GB 5750-1985）,flame atomic absorption spectroscopy was used to determine total hardness of drinking water.Result：The linear of Ca was 0.25-12mg/L and the detection limit was 0.9877mg/L. The relation standard of deviation（RSD）was 1.24%-3.95% and recovery rates were 83.05%-100.55%. The linear of Mg was 0.01-0.8mg/L and the detection limit was0.0051mg/L. RSD was 1.14%-3.85% and recovery rates were 82.7%-100.25%. Compare with national standard method,no significant difference. All samples conformed to the standard of the national drinking water hardness. The hardness of mountain spring was the lowest,tap water was the second,well water was the highest. Conclusion：Flame atomic absorption spectroscopy is rapid,accurate,simple and acceptable in determination of total hardness in drinking water.