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Molybdate Adsorption Characteristics of Volcanic-Ash-Derived Soils in Chile¹

ABSTRACT

Soils derived from volcanic ash in Chile present a high adsorption capacity for molybdate. Competitive studies with chloride, sulfate and phosphate suggest that molybdate has a high affinity for the adsorption sites in these soils. The mechanism involved on the adsorption of molybdate is qualitatively explained by the theories developed by Hingston et al. (1968, 1972) for anion adsorption by iron and aluminum oxides.

It is concluded that molybdate adsorption by volcanic-ashderived soils is due mainly to the presence of allophane and amorphous aluminum, silicon and iron compounds and is not influenced by the organic matter content of this soil.

¹ Contribution from the Dep. of Inorganic and Analytical Chemistry, Facultad de Ciencias Quimicas, Universidad de Chile and Dep. of Soil Sci. and Agr. Eng., Univ. of Calif., Riverside. Support of the Convenio Univ. of Chile-Univ. of Calif. Program and of the Comision de Investigacion of the Univ. of Chile is gratefully acknowledged.

² Instructor, Assistant Professor, and Professor of Analytical Chemistry, Univ. of Chile, and Professor of Soil Sci., Univ. of Calif., Riverside, respectively.

Received for publication December 18, 1973. Accepted for publication July 26, 1974.