正辛烷基亚氨二乙酸与Mn(Ⅱ)、Fe(Ⅱ)、Co(Ⅱ)、Ni(Ⅱ)、Cu(Ⅱ)和Zn(Ⅱ)络合平衡的研究
来源期刊:中南大学学报(自然科学版)1986年第3期
论文作者:陈超球 关鲁雄 陈克英 李亿
文章页码:95 - 103
关键词:正辛烷基亚氨二乙酸; 络合平衡; pH电位法; 络合物稳定常数
Key words:n-Octyl iminodiacetic acid; The complex equilibria; pH-potentio-metry; The stability constants of complexes
摘 要:
本文在温度25±0.1℃,离子强度μ=0.1(KNO3)的条件下,用pH电位法测定了正辛烷基亚氨二乙酸与Mn(Ⅱ)、Fe(Ⅱ)、Co(Ⅱ)、Ni(Ⅱ)、Cu(Ⅱ)和Zn(Ⅱ)络合物的稳定常数分别为: Mn(Ⅱ). Fe(Ⅱ) Co(Ⅱ) Ni(Ⅱ) Cu(Ⅱ) Zn(Ⅱ)1gKML: 5.79 7.05 8.07 8.72 10.94 7.731gKML2: 4.84 6.01 6.04 5.78 6.01 5.981gKMLHHL — 1.02 1.92 1.26 — 1.41采用过量金属离子中和曲线法和过量配体中和曲线法以及它们联合求解的数据处理方法处理数据井对处理方法作了适当的改进。
Abstract:
The complex equilibria of n-octyl iminodiacetic acid with Mn(Ⅱ),Fe(Ⅱ),Co(Ⅱ), Ni(Ⅱ), Cu(Ⅱ) and Zn(Ⅱ) have been investigated by using pH-potentiometry at 25±0.1℃ and the ionic strength 0.1(KNO3). By combining the excess metal ion method and the excess ligand method, the experimental data were treated according to Yin Qunsheng et al, and some improvement has been made. The stability constants evaluated are listed in the following table. Mn(Ⅱ). Fe(Ⅱ) Co(Ⅱ) Ni(Ⅱ) Cu(Ⅱ) Zn(Ⅱ)1gKML: 5.79 7.05 8.07 8.72 10.94 7.731gKML2: 4.84 6.01 6.04 5.78 6.01 5.981gKMLHHL — 1.02 1.92 1.26 — 1.41