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
收藏
页码：401 / 412
页数：12
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