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Soil Science Society of America Journal Abstract -

Interactions Between Organic Compounds, Minerals, and Ions in Volcanic-ash-derived Soils: I. Adsorption of Benzoate, p-OH Benzoate, Salicylate, and Phthalate Ions1


This article in SSSAJ

  1. Vol. 39 No. 4, p. 623-627
    Received: May 13, 1974
    Accepted: Feb 19, 1975

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  1. H. Appelt,
  2. N. T. Coleman and
  3. P. F. Pratt2



The adsorption, desorption, and competitive adsorption characteristics of benzoate, p-OH benzoate, salicylate, and phthalate were used as models to study the possible mechanisms involved in the interactions of organic compounds with amorphous materials. The studies were carried out in batch systems using subsoil samples of three Typic Dystrandept soils from Chile.

The adsorption of simple organic anions by soils derived from volcanic-ash can be described by an adsorption-pKa-pH relationship. The removal of organic matter with H2O2 did not affect the adsorption of organic anions. The adsorption characteristics obtained, together with desorption and competitive studies, suggest that benzoate was adsorbed by an anion-exchange reaction by volcanic-ash-derived soils. But p-OH benzoate, salicylate, and phthalate besides anion-exchange adsorption, were also adsorbed by ligand-exchange reactions. It is postulated that chelation ability would represent an important property for specific adsorption.

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