Studies of the Effectiveness of Cu 2+ , Co 2+  and Cr 3+ 
Desorption with K +  in Grey-Brown Podzolic Soils

Model studies were carried out using the three-component CuCl₂, CoCl₂ and CrCl₃ solution in two greybrown podzolic soils. After saturation of soil with the three-component solution and elution with water, desorption was carried out with the 0.1 mol dm^-3 KCl solution. For comparison, desorption with the NH₄Cl, CaCl₂ and MgCl₂ solutions was also conducted. Desorption of Cu²⁺ with K⁺ was in both soils similar to that of NH₄⁺ and Mg²⁺but smaller in comparison with Ca²⁺. In the case of Co²⁺ desorption with the studied exchangeable cations was not differentiated. Desorption of Cr³⁺ with K⁺ and NH₄ + was greater than with Ca²⁺ and Mg²⁺. The differences in desorption efficiency can be explained based on the theory of hard and soft acids and bases (HSAB).

CONFLICT OF INTEREST

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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