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Simultaneous Adsorption of Calcium and Sulfate and Its Effect on Their Movement
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Journal Article
Simultaneous Adsorption of Calcium and Sulfate and Its Effect on Their Movement
2007
Overview
Ion retention in variable-charge soils can be enhanced by the presence of certain ions with opposite charge, thereby influencing the movement of these ions through the soil profile. Studies examining these interactions are still incipient, however, especially regarding its modeling. We present results from batch and miscible displacement experiments describing Ca2+ and SO₄²⁻movement in a variable-charge soil from New Zealand. Evidence was found for ion-pair adsorption (IPA) of both Ca2+and SO₄²⁻ The results were modeled using the convection-dispersion equation (CDE), coupled with two different mathematical approaches proposed to account for IPA. The first approach related IPA to the single soil adsorption capacity, which is governed by particle-surface phenomena. For the second approach, IPA was related solely to the soil solution concentration. Both these approaches described the adsorption data from the batch experiment reasonably well, as well as the breakthrough curves from the miscible displacement experiments. The first approach showed better overall agreement. Significant differences were found, however, when the adsorption parameters were identified by fitting models to data from either batch or miscible displacement experiments. Although more studies are needed to better understand IPA, our results showed that the extent of IPA can be large and it should not be ignored when predicting SO₄²⁻ and Ca2+movement in variable-charge soils.
Publisher
Soil Science Society,Soil Science Society of America,American Society of Agronomy
Subject
/ Agronomy. Soil science and plant productions
/ Biological and medical sciences
/ calcium
/ Chemical, physicochemical, biochemical and biological properties
/ convection-disperion equation
/ Exact sciences and technology
/ Fundamental and applied biological sciences. Psychology
/ Ions
/ Mineral components. Ionic and exchange properties
/ Physics, chemistry, biochemistry and biology of agricultural and forest soils
/ Soils
/ sulfates
