镉-氨基乙酸酰胺配合物体系极谱数据的计算机分析  

Computer analysis on polarographic experimental data obtained from cadmium-glycinamide complex system

作　　者：张建民[1] 刘晨湘[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》2005年第10期951-954,共4页Computers and Applied Chemistry

基　　金：教育部留学回国人员科研启动基金资助项目(2003-14)

摘　　要：在Cd(Ⅱ)离子浓度为1.00×10-4-5.00×10-4mol·dm-3、配体与金属浓度比为50-200条件下,改变溶液的pH值, 用示差脉冲极谱技术研究Cd(Ⅱ)-氨基乙酸酰胺体系。依据极谱峰电位随溶液pH和自由金属离子浓度的变化关系,推测溶液中存在MHL、ML、ML2、ML3,和ML3,(OH)等五种金属配合物。用计算机分析程序,通过求解体系的质量平衡方程及拟合实验配合物形成曲线,优化得到MHL、ML、ML:、ML,和ML,(OH)五种金属配合物的稳定常数(logβ)分别为9.38±0.03、2.89±0.04、4.86±0.13、6.82±0.03和10.24±0.14。In this paper the Cd（ Ⅱ ）-glycinamide complex system was studied by differential pulse polarography （DPP） at cadmium total concentration 1.00 × 10^-4 -5.00 × 10^-4mol · dm^-3, fixed total-ligand to total-metal concentration ratio 50 -200 and varied pH. Five cadmium complexes, MHL, ML, ML2, ML3 , ML3 （OH） , could be present in the sample solution according to the observed shift in peak potential with pH and Log[ M ]. Using the computer analytical program, Stability constants as logβ, 9. 38 ± 0.03 for MHL, 2.89 ± 0.04 for ML, 4.86 ± 0.13 for ML2 , 6.82 ± 0.03 for ME3 , and 10.24 ± 0. 14 for ML3（OH） , are obtained by solving the massbalance equation written for the metal complex system and fitting the complex formation curve.

关 键 词：镉 氨基乙酸酰胺 金属配合物 极谱法 计算机分析程序 

分 类 号：O614.532[理学—无机化学] O641.4[理学—化学]