Research article - Peer-reviewed, 2008
Modeling of metal binding in tropical Fluvisols and Acrisols treated with biosolids and wastewater
Khai, Nguyen Manh; Oborn, Ingrid; Hillier, Steve; Gustafsson, Jon PetterAbstract
There is growing concern about the accumulation of metals in tropical agricultural soils. In this study, experimental results from batch studies were used to test whether multi-surface geochemical models could describe metal binding in selected Vietnamese soils. The multi-surface models considered metal binding to iron hydroxides (using the diffuse layer model), organic matter (Stockholm Humic model and NICA-Donnan model), and phyllosilicate clay (Gaines-Thomas equation) as well as complexation to dissolved organic and inorganic ligands in the solution phase. We found that for total dissolved Cd, Cu and Zn the two multi-surface models being tested provided very good model fits for all soils, as evidenced by low root-mean square errors between model predictions and observations. These results suggest that organic matter is an important sorbent for many metals in these soils. However, poor fits were obtained for Cr(III), Mn and Pb for all soils. The study also suggests that the pH is the main factor that controls the solubility of metals in tropical Fluvisols and Acrisols subjected to application of biosolids and wastewater, and that advanced multi-surface models can be used to simulate the binding and release of many trace metals. (c) 2007 Elsevier Ltd. All rights reserved.Keywords
adsorption; cadmium; copper; heavy metal; trace metal; zincPublished in
Chemosphere2008, volume: 70, number: 8, pages: 1338-1346
Authors' information
Khai, Nguyen Manh
Swedish University of Agricultural Sciences, Department of Soil Sciences
Swedish University of Agricultural Sciences, Department of Soil Sciences
Hillier, Steve
The Macaulay Land Use Research Institute
Gustafsson, Jon Petter (Gustafsson, Jon-Petter)
Royal Institute of Technology (KTH)
Sustainable Development Goals
SDG6 Clean water and sanitation
UKÄ Subject classification
Environmental Sciences related to Agriculture and Land-use
Agricultural Science
Publication Identifiers
DOI: https://doi.org/10.1016/j.chemosphere.2007.09.046
URI (permanent link to this page)
https://res.slu.se/id/publ/17433