EFFECT OF IONIC-STRENGTH ON COMPLEXING EQUILIBRIUM BETWEEN COPPER(II) AND HUMIC-ACID

被引：11

作者：

FUKUSHIMA, M

TANAKA, S

TAGA, M

机构：

[1] Department of Chemistry, Faculty of Science Hokkaido University

来源：

INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY | 1994年 / 56卷 / 03期

关键词：

HUMIC ACID; COPPER(II) COMPLEXING ABILITY; THERMODYNAMIC STABILITY CONSTANT;

D O I：

10.1080/03067319408034103

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The effect of ionic strength on copper(II) complexing ability of humic acid (HA) was investigated. The conditional stability constants and the copper(II) complexing capacities were evaluated at the ionic strength of 0.005 - 0.1. The copper(II) complexing capacities of HA increased with ionic strength. By extrapolating the conditional stability constants to ionic strength 0, the thermodynamic stability constant was evaluated. The free ligand concentration in the solution containing copper(II) and humic acid was calculated by using the thermodynamic stability constant obtained. The free ligand concentration also increased with ionic strength. The increase of copper(II) complexing ability of HA with ionic strength was discussed from the viewpoints of the dissociation of the acidic functional groups in HA and the conformational change of HA.

引用

页码：229 / 237

页数：9

共 22 条

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