【摘要】 当所用的净水剂为聚合氯化铝时,铬天青S法不能准确测定出饮用水中铝含量(测定结果小于真实值),必须对方法进行改进,即取一定量的试样,用盐酸将其pH调整到1以下,加热至近沸,再用氢氧化钠溶液将试样pH调整到7左右,然后按照铬天青S法的测定步骤继续测定。更多还原

【Abstract】 During poly-aluminum chloride being used as coagulant, the Al content in drinking water can’t be determined accurately (results obtained lower than true values) by chrome azurol S method. In this condition, modification of the method must be applied, i.e. pH of water sample must be adjusted with acid to below 1 and then boiled, and the sample should be adjusted to pH=7, and then be analyzed by chrome azurol S method.更多还原