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The sorption of selenite by two allophanic soils containing high amounts of variable charge materials was studied. Selenite sorption exhibited a maximum near pH 4 and decreased, although not proportionally, with increasing pH. Only negligible amounts of selenite were sorbed above pH 7.In the two soils, the addition of selenite caused a release of sulphate (SO 2-4 ), silicate (Si)...
The effect of application of liming material (CaCO 3 or CaSiO 3 ) and phosphate, on pH, exchangeable Al, effective cation exchange capacity (ECEC) and P solubility is studied in several variable-charge soils of volcanic origin from Canary Island (Spain). The amendments were added to replace 1.5x or 2.5x exchangeable Al, and P was applied at rates to provide equilibrium solution concentrations...