CUPRIC ION COMPLEXATION BY FULVIC-ACID EXTRACTED FROM SEWAGE-SLUDGE SOIL MIXTURES

被引：56

作者：

SPOSITO, G

HOLTZCLAW, KM

LEVESQUEMADORE, CS

机构：

来源：

SOIL SCIENCE SOCIETY OF AMERICA JOURNAL | 1979年 / 43卷 / 06期

关键词：

D O I：

10.2136/sssaj1979.03615995004300060018x

中图分类号：

S15 [土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

The complexes formed between Cu2+ and fulvic acid extracted from sewage sludge were investigated by potentiometric titration of K/H fulvate with Cu(ClO4)2 at pH 5 and 25°C, in an ionic medium of 0.1 M KClO3. Formation functions, giving the number of moles of Cu2+ bound per mole of K/H fulvate, were calculated from the titration data and plotted against the molar concentration of Cu2+, with the concentration of K/H fulvate being a fixed parameter for each plot. These functions were analyzed by the Scatchard plot method and were interpreted as evidence of: (i) a relatively strong 1:1 complex that is formed between Cu2+ and the most acidic functional groups in fulvic acid and (ii) a weaker set of complexes that is formed between Cu2+ and the more weakly acidic functional groups acting as both unidentate and bidentate ligands.

引用

页码：1148 / 1155

页数：8

共 19 条

[1] STABILITY-CONSTANTS FOR COMPLEXATION OF COPPER(II) IONS WITH WATER AND SOIL FULVIC ACIDS MEASURED BY AN ION-SELECTIVE ELECTRODE [J].