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方法原理铝在pH=2时用EDTA钠盐过量滴定。过量EDTA钠盐在pH=4—5时,以铬天青-S为指示剂,用标准硫酸铜滴定。铬天青-S是2,6-二氯二甲基磺化洋红二羧酸的钠盐,具有下列结构式:
Method principle Aluminum Titration with sodium EDTA over pH = 2. Excess EDTA sodium salt is titrated with chrome azure-S as an indicator at pH = 4-5 with standard copper sulfate. Chrysin-S is a sodium salt of 2,6-dichlorodimethylsulfonated manganic dicarboxylic acid having the following structural formula: