稀土在桑蚕丝织物染色中的作用——轻稀土离子与酸性染料、氨基酸配合物在溶液中的稳定性和机理

The Action of Rare Earth on Real Silk Dyeing——The Stability and Mechanism of Complexes of Light Rare Earth Ions and Acid Dye and Amino Acid in Solution

本文用 pH 电位滴定法测定稀土离子镧、钕、钐、铕,钆分别与酸性红 G,酪氨酸、天冬氨酸、色氨酸的配合物稳定常数;同时在高温 pH 计测定60～80℃不同温度下的稳定常数;并以 pH 电位滴定法及三元相图法表示出钕离子,酸性红 G,酪氨酸在该实验条件下未能生成三元混配配合物,从而提出稀土在染色中的作用机理。

The coordination stability constants of the complexes respectively formed by different light rare earth ions(La^(3+),Na^(3+),Sm^(3+),Eu^(3+),Gd^(3+))and acid red G,tyrosine,aspartic acid,and tryptophane are determined by pH-poten- tiometry,and the stability constants under 60—80 centi-degrees are determi- ned by high-temperature pH-potentiometry.The fact that Na^(3+),acid red G, and tyrosine fail to form a mixed-ligand complex is shown by means of pH- potentiometry and triangular phase diagram,thus presenting the mechanism of rare-earth silk dyeing.