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一、镀铬溶液杂质铁的钛铁指示剂容量测定法1.方法摘要:钛铁指示剂本身无色,但它与 Fe~(+++)形成深绿色的络合物。在 PH=2.0～2.5时,此络合物不如 Fe—EDTA 络合物稳定。因此EDTA 能夺取该络合物中的铁,将无色的指示剂游离出来,终点由绿色变黄色。
First, the chrome solution impurity ferrotitanium indicator capacity measurement method 1. Method summary: Ferrotitanium indicator itself colorless, but it with Fe ~ (+++) to form a dark green complex. At PH = 2.0-2.5, this complex is not as stable as the Fe-EDTA complex. Therefore, EDTA can sequester the iron in the complex, freeing the colorless indicator from green to yellow.