Cationic Effects on Sulfate Adsorption by Soils1
- Tsun Tien Chao,
- M. E. Harward and
- S. C. Fang2
The magnitude of sulfate adsorption from different salt solutions, ranging 5 to 100 ppm. S, by soils was in the order CaSO4 > K2SO4 > (NH4)2SO4 > Na2SO4. The magnitude of sulfate adsorption by soils saturated with different cations followed the order of chemical valency of the saturating cations (Al3+ > Ca2+ > K+). The influence of different cations on sulfate adsorption was shown to be associated with two factors: nature of cations and pH. Resolution of the two factors indicated that pH had greater influence than the type of cations. As neutrality was approached, sulfate adsorption decreased considerably regardless of the type of saturating cation. However, there was still a cation effect in addition to the pH effect over the pH range studied. The influence of different cations was attributed to possible effects of electrokinetic potentials and anion repulsion. The effect of pH on sulfate adsorption was greater in soils containing higher amounts of sesquioxides, exchangeable aluminum and/or amorphous materials.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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