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Interactions Between Organic Compounds, Minerals, and Ions in Volcanic‐ash‐derived Soils: I. Adsorption of Benzoate, p‐OH Benzoate, Salicylate, and Phthalate Ions
Author(s) -
Appelt H.,
Coleman N. T.,
Pratt P. F.
Publication year - 1975
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1975.03615995003900040017x
Subject(s) - adsorption , chemistry , desorption , inorganic chemistry , ion exchange , soil water , organic matter , subsoil , phthalate , environmental chemistry , organic chemistry , ion , geology , soil science
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 H 2 O 2 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.