The acidobasic and complexation properties of humic acids - Study of complexation of Czech humic acids with metal ions

被引：62

作者：

Lubal, P ^{[1
]}

Siroky, D ^{[1
]}

Fetsch, D ^{[1
]}

Havel, J ^{[1
]}

机构：

[1] Masaryk Univ, Fac Sci, Dept Analyt Chem, CS-61137 Brno, Czech Republic

来源：

TALANTA | 1998年 / 47卷 / 02期

关键词：

complexation; humic acids; metal ions; modeling;

D O I：

10.1016/S0039-9140(98)00143-X

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The acid-base and complexation properties of humic acids (HAs) extracted from bohemian brown coals were studied. The acid-base behavior corresponds with the model of KA as a mixture of mono- and diprotic acids. This model was also verified on commercial HA substances (Aldrich and Fluka). HA binds strongly with heavy metal ions and the highest stability constant of HA-metal ion complexes was observed for copper(IT). Stability constant values were found to decrease in the order: Cu2+ > Ba2+ > Pb2+ > Cd2+ > Ca2+. Both acidobasic models for HA alone and those for HA-metal ion interactions were proposed and the computational methodology for polyelectrolyte equilibria studies demonstrated. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：401 / 412

页数：12

共 21 条

[1] POTENTIOMETRIC STUDY OF ACID-BASE PROPERTIES OF HUMIC-ACID USING LINEAR FUNCTIONS FOR TREATMENT OF TITRATION DATA [J].