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Adsorption–Desorption of Arsenate in Three Spanish Soils

^a Instituto Tecnológico Agrario de Castilla y León, Ctra. de Burgos, Km. 119, 47014 Valladolid, Spain
^b Dep. de Ingeniería Química, Universidad de Valladolid, Prado de la Magdalena s/n, 47005 Valladolid, Spain

View larger version (109K): [in a new window]   Fig. 1. Map of the surveillance zone (blue shaded region) including Eresma and Adaja rivers, and the cities of Valladolid and Iscar.

View larger version (22K): [in a new window]   Fig. 2. Evolution of the concentration of dissolved As(V) in the kinetics experiments: clay soil (open circles), sandy clay loam soil (open squares), and loamy sand soil (filled circles). Dashed line represents the time at which the pseudoequilibrium was reached.

View larger version (16K): [in a new window]   Fig. 3. Equilibrium concentrations after the four-step water extraction experiments with the untreated soil for the estimation of qi for the loamy sand soil (811.4 m ± 3.7 µg kg–1). Duplicated experiments generated two points for each extraction step.

View larger version (20K): [in a new window]   Fig. 4. Adsorption isotherms of As(V) in soils at 25°C: clay soil (open circles), sandy clay loam soil (open squares), and loamy sand soil (filled circles). The solid lines represent linear isotherms, and the dotted lines, only visible for the clay soil, represent the Freundlich isotherms.

View larger version (14K): [in a new window]   Fig. 5. Desorption isotherms at 25°C for the three studied soils.

View larger version (18K): [in a new window]   Fig. 6. Parameters after fitting the desorption isotherms as a function of the initial concentration. S.C.L., sandy clay loam soil; L.S., loamy sand soil. No appreciable desorption was found in the clay soil.

View larger version (19K): [in a new window]   Fig. 7. Effect of temperature on the adsorption of As(V) in the sandy clay loam soil: 15°C (triangles), 25°C (circles), and 40°C (squares).

View larger version (17K): [in a new window]   Fig. 8. Adsorption isotherms of As(V) in the sandy clay loam soil (filled circles) and effect of the presence of KNO3 (open circles).

View larger version (16K): [in a new window]   Fig. 9. Arsenate adsorption isotherms in sandy clay loam soil (filled circles) and effect of the presence of K3PO4 (open circles).