【摘要】 在37±0.1℃、离子强度0.15mol/L（KNO₃）条件下,作者用pH电位法研究了甘氨酸、DL-丙氨酸与Cu（Ⅱ）、Ni（Ⅱ）、Co（Ⅱ）、Zn（Ⅱ）所形成的二元及三元配合物,并分别测定了在上述条件下甘氨酸、DL-丙氨酸的离解常数及与这些金属离子所形成的二元及三元配合物的稳定常数,同时绘出了三元体系中各配合物的物种随pH值改变的分布图。更多还原

【Abstract】 The equilibria involved in the forma-tion of ternary complexes of Cu （Ⅱ）,Ni （Ⅱ）, Co （Ⅱ） and Zn （Ⅱ） with glycineand DL-alanine have been studied, respec-tively, by pH-potentiometric titration at37℃ and I=0. 15 mol/L （KNO₃） in aque-ous medium. The auxiliary data such asacid dissociation constants of amino-acidsand binary stability constants of thesemetal ions have been also obtained underidentical conditions. According to our data,the stability of the metal complexes can bearranged in the order Cu²⁺>Ni²⁺>Zn²⁺>Co²⁺. The distributions of different com-plex species present in the solutions as afunction of pH are demonstrated.更多还原