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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。
Under the conditions of Cd (Ⅱ) ion concentration of 1.00 × 10-4-5.00 × 10-4 mol · dm-3 and ligand-metal concentration ratio of 50-200, the pH value of the solution was changed, Cd (Ⅱ) - glycine amide system. According to the relationship between polarographic peak potential and solution pH and the concentration of free metal ions, five metal complexes such as MHL, ML, ML2, ML3, and ML3, (OH) exist in the solution. The stability constants (logβ) of the five metal complexes of MHL, ML, ML:, ML, ML and (OH) were optimized by solving the mass balance equation of the system and fitting the experimental complex formation curve by computer analysis program 9.38 ± 0.03, 2.89 ± 0.04, 4.86 ± 0.13, 6.82 ± 0.03 and 10.24 ± 0.14.