计算机拟合络合物形成曲线用于络合物稳定常数的研究  

Study on complex stability constants by computer fitting complex formation curve

作　　者：张建民[1] 王承霞[1] 

机构地区：[1]郑州大学化学系,河南郑州450052

出　　处：《计算机与应用化学》2003年第6期813-816,共4页Computers and Applied Chemistry

基　　金：教育部留学回国人员科研启动基金(2003)

摘　　要：在Cd(Ⅱ)离子浓度为2×10^(-4)mol/L、络合剂与金属浓度比为30～60条件下,改变溶液的pH值,用示差脉冲极谱技术研究Cd(Ⅱ)-HIDA(N-羟乙基-N,N-二羧乙基胺)体系。通过计算机分析程序求解体系的质量平衡方程及拟合实验络合物形成曲线,优化得到Cd(Ⅱ)和HIDA形成的络合物CdL和CdL_2^(2-)的稳定常数,分别为7.26±0.02和12.54±0.04。The Cd(III) - HIDA( N - (2 - hydroxyethyl) iminodiacetic acid) system was studied by differential pulse po-larography (DPP) at fixed total - ligand to total - metal concentration ratio 30 ~ 60 and varied pH. Stability constants of metal complexes are obtained by solving the mass - balance equation written for the metal complex system and fitting the complex formation curve. The experimental parameters of polarographic peaks ( a shift in peak potential and a variation in a peak height) are included in the complex formation curve. Two cadmium complexes CdL, CdL22- and the refinement of their stability constants as 7.26 +0.02 and 12.54 +0.04, respectively, are reported.

关 键 词：电化学极谱分析 计算机拟合络合物 形成曲线 稳定常数 示差脉冲极谱 镉 HIDA 

分 类 号：O614.242[理学—无机化学] O657.14[理学—化学]