Gaines-Thomas and Rothmund-Kornfeld descriptions of potassium-calcium exchange on variable surface charge soils

Escudey, M.; Díaz P; Forster, JE; Pizarro C.; Galindo, G.

Abstract

The empirical Rothmund-Kornfeld power function approach (in terms of equivalent fractions) was applied to potassium-calcium (K-Ca) exchange equilibrium carried out at 25°C and 0.05 M ionic strength on 4 soils derived from volcanic materials in southern Chile. Results were compared with those obtained by the Gaines-Thomas approach, where a K preference was observed in all samples, with equilibrium constant values ranging from 0.097 to 0.492. The equivalent fraction form of Rothmund-Kornfeld fit the exchange isotherm curves obtained by the Gaines-Thomas convention and provides a good description of experimental exchange data. The exchange equilibrium constants and adsorbed ion activity coefficients calculated with Rothmund-Kornfeld parameters are comparable with those obtained by the Gaines-Thomas approach.

Más información

Título según WOS: Gaines-Thomas and Rothmund-Kornfeld descriptions of potassium-calcium exchange on variable surface charge soils
Título según SCOPUS: Gaines-Thomas and Rothmund-Kornfeld descriptions of potassium-calcium exchange on variable surface charge soils
Título de la Revista: COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS
Volumen: 32
Número: 19-20
Editorial: TAYLOR & FRANCIS INC
Fecha de publicación: 2001
Página de inicio: 3087
Página final: 3097
Idioma: English
URL: http://www.tandfonline.com/doi/abs/10.1081/CSS-120001109
DOI:

10.1081/CSS-120001109

Notas: ISI, SCOPUS