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Potassium-calcium and sodium-calcium exchange on kaolinite and kaolinitic soils
Year:
1988
Authors :
Levy, Guy
;
.
Shainberg, Isaac
;
.
Volume :
52
Co-Authors:
Levy, G.J., SIRI, South Africa
Van Der Watt, H.v.H., SIRI, South Africa
Shainberg, I., SIRI, South Africa
du Plessis, H.M., SIRI, South Africa
Facilitators :
From page:
1259
To page:
1264
(
Total pages:
6
)
Abstract:
Potassium-Ca and Na-Ca exchange isotherms were obtained for two kaolinite samples and two kaolinitic soils (Hutton and Avalon forms). The Gapon, Vanselow, and Gaines-Thomas corrected selectivitiy coefficients were usually greater for K-Ca exchange than for Na-Ca exchange, as was expected. The exchange isotherms and selectivity coefficients suggested a preference for K relative to Ca on all four exchangers. The contribution of micaceous impurities to the observed high affinity for K was taken into consideration, by reasoning that exchange sites with high affinity for K resulting from these impurities are first saturated with K [i.e, at low exchangeable potassium percentage (EPP) values]. It is suggested that the high charge density of kaolinite enhances K dehydration, resulting in a high affinity of kaolinite per se for K.
Note:
Related Files :
Avalon soil
Clay minerals
Hutton soil
kaolinitic soil
Kaolinitic Soils
Selectivity Coefficients
sodium-calcium exchange
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More details
DOI :
Article number:
0
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
29468
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:47
Scientific Publication
Potassium-calcium and sodium-calcium exchange on kaolinite and kaolinitic soils
52
Levy, G.J., SIRI, South Africa
Van Der Watt, H.v.H., SIRI, South Africa
Shainberg, I., SIRI, South Africa
du Plessis, H.M., SIRI, South Africa
Potassium-calcium and sodium-calcium exchange on kaolinite and kaolinitic soils
Potassium-Ca and Na-Ca exchange isotherms were obtained for two kaolinite samples and two kaolinitic soils (Hutton and Avalon forms). The Gapon, Vanselow, and Gaines-Thomas corrected selectivitiy coefficients were usually greater for K-Ca exchange than for Na-Ca exchange, as was expected. The exchange isotherms and selectivity coefficients suggested a preference for K relative to Ca on all four exchangers. The contribution of micaceous impurities to the observed high affinity for K was taken into consideration, by reasoning that exchange sites with high affinity for K resulting from these impurities are first saturated with K [i.e, at low exchangeable potassium percentage (EPP) values]. It is suggested that the high charge density of kaolinite enhances K dehydration, resulting in a high affinity of kaolinite per se for K.
Scientific Publication
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