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(一)前言螯合电位滴定是电位滴定的一个主要组成部分,文献极为丰富。这些滴定主要是在金属电极和离子选择电极上进行的。金属电极分为两类:配偶型和非配偶型。配偶型电极如Pt/Fe~(3+);Fe~(2+)、Hg/Hg~(2+);HgY~(2-);MY~(n-4)M~(n+),其“电极/溶液”界面上总有一对决定电位的电对。非配偶型电极的界面上则不存在明显的电对,如铂电极上EDTA滴定Ca~(2+),溶液中不外加高价的铂离子;滴定Fe~(3+),也不外加Fe~(2+)。关于非配偶型电极上的螯合滴定,虽有
(A) Introduction Chelation potential titration potentiometric titration is a major component of the literature is extremely rich. These titrations are mainly performed on metal and ion-selective electrodes. Metal electrodes fall into two categories: spouses and non-spouses. The conjugate electrodes such as Pt / Fe ~ (3 +); Fe ~ (2 +), Hg / Hg ~ (2 +); HgY ~ There is always a pair of potential pairs on the Electrode / Solution interface. Non-spouse electrode interface is not obvious on the right, such as EDTA titration on the platinum electrode Ca ~ (2+), the solution does not increase the price of platinum ions; Titration Fe ~ (3 +), do not add Fe ~ (2+). There are chelation titrations on non-spouse electrodes