铬天青S分光光度法和电感耦合等离子体质谱法在净水残余铝测定中的应用

Application of chrome azurol S spectrophotometry and ICP-MS in aluminum determination in drinking water

目的为准确测定饮用水中铝含量,对铬天青S分光光度法(CAS法)和电感耦合等离子体质谱法(ICP-MS法)进行分析比较,为净水生产提供准确依据。方法于2017年7月,采集天津市市区3个水厂的出厂水和管网水,分别使用铬天青S分光光度法和电感耦合等离子体质谱法检测铝。结果出厂水和管网水的铝含量满足国家饮用水标准的限值要求,铬天青S分光光度法检测的铝含量低于电感耦合等离子体质谱法检测的铝含量,差异有统计学意义(P<0.01)。结论电感耦合等离子体质谱法对铝的检测更为真实严格,适合用来指导净水生产。

Objective To exactly determine the content of aluminum in drinking water and offer accurate information for the drinking water production, and to compared the results from chrome azurol S spectrophotometry and inductively coupled plasma-mass spectrometry. Methods The samples from finished water and tap water in Tianjin were collected in July, 2012 and were tested by chrome azurol S spectrophotometry and inductively coupled plasma-mass spectrometry respectively. Results The content of aluminum in the samples of finished water and tap water met the requirements of national standards and the aluminum content determined by chrome azurol S spectrophotometry was lower than that determined by inductively coupled plasma-mass spectrometry with a significant difference（P〈0.01）. Conclusion Inductively coupled plasma-mass spectrometry is true and strict in aluminum determination and suitable to guide drinking water production.