Fe/Cu-EDTA络合电极电势的影响因素及探索  

Research of Fe/Cu-EDTA complex electrode potential-pH relationship

作　　者：王新红[1] 戴兢陶[1] 

机构地区：[1]盐城师范学院化学化工学院,江苏盐城224051

出　　处：《实验室科学》2013年第1期11-13,16,共4页Laboratory Science

基　　金：校级教育科学研究项目(项目编号:12YCTCJY041)

摘　　要：利用电池电动势测定方法,从温度和EDTA的浓度探究了Fe3+/Fe2+-EDTA体系及Cu2+/Cu+-EDTA体系的电极电势-pH关系图。结果表明,在Fe-EDTA体系中,随着温度的升高,电极电势和pH平台范围均呈现下降趋势;EDTA浓度为0.12 mol.L-1时平台区范围最大。在Cu-EDTA体系中,随着温度升高,体系的pH平台范围逐渐减小甚至消失,各温度间的电极电势差别增大;EDTA浓度为0.2 mol.L-1实验结果较好。金属离子与EDTA形成的络离子的分布pH范围与文献基本一致。This experiment is to determinate the electrode potential-pH relationship of Fe^3＋/Fe^2＋-ED- TA and Cu2＋/Cu^＋-EDTA system with different temperature and different EDTA concentration. The re- sults show that the electrode potential and pH platform range present downward trend with the tempera- ture increasing in Fe^3＋/Fe^2＋-EDTA system, and the platform range is the widest range as EDTA con- centration is 0. 12mol·L^-1. While in the Cu^2＋/Cu^＋-EDTA system, the platform range gradually re- duce or even disappear, and electrical potential difference in each temperature is becoming wider. When EDTA concentration is 0. 20mol·L^-1, experimental result becomes better. The distribution range of the complexion of metalions and EDTA is in basic agreement with literature.

关 键 词：电势-PH图 EDTA络合电势 温度 

分 类 号：O551.1[理学—热学与物质分子运动论]