Surface charge properties of an Haplustoll from Argentina

The surface charge properties of colloidal particles of an Entic Haplustoll soil were examined by using potentiometric titrations and the effects of organic matter on these properties at a pH near the field pH of the soil were investigated. The colloidal soil particles carried negative charges in bo...

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Bibliographic Details
Published in:Geoderma 1993-11, Vol.59 (1), p.345-351
Main Authors: Velasco, Manuel I., Carlos P., De Pauli
Format: Article
Language:English
Subjects:
argentina
argentine
clay minerals
colloidal properties
Earth sciences
Earth, ocean, space
Exact sciences and technology
materia organica
matiere organique
mineral argileux
minerales de arcilla
organic matter
potenciometria
potentiometrie
potentiometry
propiedades coloidales
propriete colloidale
Soils
Surficial geology
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Summary:The surface charge properties of colloidal particles of an Entic Haplustoll soil were examined by using potentiometric titrations and the effects of organic matter on these properties at a pH near the field pH of the soil were investigated. The colloidal soil particles carried negative charges in both horizons studied and in a wide pH range, as indicated by their low apparent zero point charge (AZPC) values (pH < 2). The soil studied had clay minerals with predominant negative permanent charges. The contribution of variable negative charges due to soil organic matter becomes more important as the pH values increase.
ISSN:0016-7061
1872-6259
DOI:10.1016/0016-7061(93)90078-Y