Abstract
Adsorption of V(V) and Mo(VI) from 10-4 M and 10-5 M solutions and W(VI) from a 10-4 M solution (in 0.02 M KCI) by three Finnish mineral soils was studied in two series of experiments. In the first experiment, the adsorption of V, Mo and W by soil and the desorption of P were measured at the soils’ natural pH after an equilibration time of 3, 5, 22, 29, 46 and 70 h. Adsorption of molybdate occurred mainly within the three first hours, whereas adsorption of vanadate and tungstate were slower processes. During the first few hours, the presence of molybdate seemed to increase the desorption of phosphate most effectively, but after a longer equilibration period, the differences between additions of V, Mo, and W became smaller. In the second experiment, the adsorption process was followed as a function of the acidity of the suspension (pH 2.3-7.5; for W pH 2.8-7.5). Adsorption of V(V), Mo(VI) or W(VI) resulted in a statistically significant increase in the amounts of P desorbed from all three soils over the pH range studied. The aqueous chemistry of V(V), Mo(VI) and W(VI) is briefly discussed.
Highlights
In studying adsorption of anions by different materials, soils, without doubt, are the most complicated adsorbents
When different anions are present in soil solution or in the solution in contact with adsorbent, competitive adsorption may occur
When studying retention of V(V), Mo(VI) and W(VI) by three Finnish soils from sodium oxysalt solutions (Mikkonen and Tummavuori 1993 b,c,d), we followed how quickly adsorption of V, Mo and W occurs at the natural soil pH and how much P is released to the aqueous phase
Summary
Desorption of phosphate from three Finnish mineral soil samples during adsorption of vanadate, molybdate, and tungstate. (Department of Chemistry, University of Jyväskylä, P.0.80x 35, FIN-40351 Jyväskylä.). Adsorption of V(V) and Mo(VI) from 10 4 M and 10 ' M solutions and W(VI) from a 10"4 M solution (in 0.02 M KCI) by three Finnish mineral soils was studied in two series of experiments. The adsorption of V, Mo and W by soil and the desorption of P were measured at the soils’ natural pH after an equilibration time of 3,5, 22, 29, 46 and 70 h. During the first few hours, the presence of molybdate seemed to increase the desorption of phosphate most effectively, but after a longer equilibration period, the differences between additions of V, Mo, and W became smaller. The aqueous chemistry of V(V), Mo(VI) and W(VI) is briefly discussed
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