稀土与亮氨酸、天冬氨酸二元及三元体系的pH法研究

Study on Binary and Ternary Complexes of Rare Earths with Leucine and Aspartic Acid by Potentiometric Titration

本文报道在生理条件下稀土与 L-亮氨酸、L-天冬氨酸二元及三元体系的 pH 电位法研究数据.结果表明,随着稀土原子序数的升高(钇除外),二元及三元配合物积累稳定常数均缓慢增大,稀土离子主要是以荷电配合物形式存在.

A potentiometric method on binary and ternary complexes of rare earthswith L-leucine and L-aspartic acid is reported here.The results show that stability con-stants of binary and ternary complexes increase slowly from cerium to lutetium.Distri-bution curves of ternary complex species show that rare earth(Ⅲ)existed mainly in theform of electrical species at the physiological pH region.