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铜离子选择电极在EDTA 络合滴定中的应用已有报导,一般采用Cu(Ⅱ)—EDTA 作指示剂,用EDTA 标准液滴定或用铜溶液回滴过量的EDTA,测定某些金属离子,但尚未见其用于微量铝的络合滴定.用两价金属离子溶液滴定EDTA(回滴过量的EDTA 类似),以离子选择电极指示电势,假设滴定前后体积不变,则根据金属离子浓度的变化,从Nernst 方程可求出相应的电势.
Copper ion selective electrode in the EDTA complexation titration has been reported, the general use of Cu (Ⅱ) -EDTA as an indicator, with EDTA standard titration or titration with excess copper EDTA solution, the determination of some metal ions, but Titration of EDTA with a divalent metal ion solution (similar to EDTA with an excess of titration) has not been seen, and the potential is indicated with an ion-selective electrode. Assuming that the volume before and after the titration is constant, according to the change of the metal ion concentration , From the Nernst equation can be obtained by the corresponding potential.