金属指示剂相关问题的探讨

Discussion on the Issues Related Metal Indicator

本文从金属指示剂的分类、具备的条件和作用原理等方面,探讨配位滴定过程中所使用指示剂涉及的相关问题。总结了常用几类金属指示剂的使用条件和指示剂确定滴定终点的方式,阐述了溶液的pH值及各种副反应对指示剂变色点的影响规律及指示剂变色点的计算方法,提供了减小滴定终点误差、提高方法准确度的依据。

The problems about metal indictor used in complexometric titration which contained classification,required conditions and reaction principle of the metal indicator were summarized in the paper.The using conditions of the several kind of metal indicator and the way altering titration end via color changing were pointed out.The influences of pH value of solution and all side reaction on color change point value of indicator and the calculating method were explained in order to gain accurater titration end error and explicit the accuracy of method.