Metal ion binding by humic acid: Application of the NICA-Donnan model

被引:485
作者
Kinniburgh, DG
Milne, CJ
Benedetti, MF
Pinheiro, JP
Filius, J
Koopal, LK
VanRiemsdijk, WH
机构
[1] WAGENINGEN UNIV AGR,DEPT PHYS & COLLOID CHEM,6703 HB WAGENINGEN,NETHERLANDS
[2] BRITISH GEOL SURVEY,WALLINGFORD OX10 8BB,OXON,ENGLAND
[3] UNIV PARIS 06,LAB GEOCHIM & METALLOGENIE,F-75252 PARIS 05,FRANCE
[4] UNIV ALGARVE,UNIDAD CIENCIAS EXACTAS & HUMANAS,P-8000 FARO,PORTUGAL
关键词
D O I
10.1021/es950695h
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
A Donnan-type model for nonspecific binding of electrolyte ions has been combined with the nonideal competitive adsorption (NICA) model for specific binding to produce a model for ion binding to humic substances. The model considers site heterogeneity, non-ideality, multicomponent competition, and electrostatic interactions. The NICA-Donnan model was fitted to data for H, Ca, Cd, Cu, and Pb binding by a purified peat humic acid. The model fits were good and covered a wide range of pH and free metal concentrations. The parameters from these single metal data sets were then used to predict the competitive effect of Ca on Cd and Cu binding at various pHs. These predictions agreed well with the experimental data although there were some small but systematic differences. The new NICA-Donnan model also predicted reasonably well the increase in Cd and Cu binding on changing from a 0.1 M KNO3 background electrolyte to 0.01 M KNO3. A shortcoming of the model is that in some cases it significantly underestimated the H+/M(2+) exchange ratio, especially at high pH and for Cu binding.
引用
收藏
页码:1687 / 1698
页数:12
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