Studies of the Effectiveness of Cu2+, Co2+ and Cr3+ Desorption with K+ in Grey-Brown Podzolic Soils
T. Paszko*, R. Gąszczyk, P. Muszyński
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Department of Chemistry, Agricultural University, Akademicka 15, 20-950 Lublin, Poland
Pol. J. Environ. Stud. 2004;13(2):171–175
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).