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Metal Ion Binding by Humic Acid: Application of the NICA-Donnan Model
Open accessAbstract
A Donnan-type model for nonspecific binding of electrolyte ions has been combined with the non-ideal 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 KNO 3 background electrolyte to 0.01 M KNO 3 . 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.
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Cites
Complexation of zinc by natural organic ligands in the central North Pacific
Bruland, K. W. (1989) · Limnology and Oceanography · doi:10.4319/lo.1989.34.2.0269 · Cited by 467
Cited by
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Kim, R.-Y., Yoon, J.-K., Kim, T.-S., Yang, J. E., Owens, G., & Kim, K.-R. (2015) · Environmental Geochemistry and Health · doi:10.1007/s10653-015-9695-y · Cited by 541
Namgay, T., Singh, B., & Singh, B. P. (2010) · Soil Research · doi:10.1071/sr10049 · Cited by 395
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Baun, D. L., & Christensen, T. H. (2004) · Waste Management & Research: The Journal for a Sustainable Circular Economy · doi:10.1177/0734242x04042146 · Cited by 296
Effects of inorganic ions and natural organic matter on the aggregation of nanoplastics
Cai, L., Hu, L., Shi, H., Ye, J., Zhang, Y., & Kim, H. (2018) · Chemosphere · doi:10.1016/j.chemosphere.2018.01.052 · Cited by 263
Metadata
- Authors
- Kinniburgh, D. G., Milne, C. J., Benedetti, M. F., Pinheiro, J. P., Filius, J., Koopal, L. K., & Van Riemsdijk, W. H.
- Venue
- Environmental Science & Technology
- Publisher
- American Chemical Society (ACS)
- Published
- 1996-04-01
- Volume
- 30
- Issue
- 5
- Pages
- 1687-1698
- ISSN
- 0013-936X (ISSN-L)
- 1520-5851
- OpenAlex
- W2045366746
- Cited by
- 558
- References
- 1
- FWCI
- 31.87
- Type
- journal article
- Language
- en
- Open access
- green
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- Kinniburgh, D. G., Milne, C. J., Benedetti, M. F., Pinheiro, J. P., Filius, J., Koopal, L. K., & Van Riemsdijk, W. H. (1996). Metal Ion Binding by Humic Acid: Application of the NICA-Donnan Model. Environmental Science & Technology. https://doi.org/10.1021/es950695h
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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