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Describing the adsorption of potential determining ions on variable charge mineral surfaces

Melis, Pietro and Dixit, S. and Premoli, Alessandra Maria and Gessa, Carlo Emanuele (1983) Describing the adsorption of potential determining ions on variable charge mineral surfaces. Studi sassaresi: organo ufficiale della Società sassarese di Scienze mediche e naturali. Sez. 3: Annali della Facoltà di Agraria dell'Università di Sassari, Vol. 30 , p. 137-148. ISSN 0562-2662. Article.

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A computer program was developed to elaborate the titration curves of amphoteric surfaces according to the double layer theory. The zpc, identified from the intersection point of the titration curves carried out at different ionic strengths, fell at pH 3.15, 9.45 and 7.65 for Si, AI and Fe hydroxides, respectively. The Stern model described quite satisfactorily the relation between σ0 and ψ0. Some problem was presented by Si surfaces which were then treated by a different calculation procedure. The δ values, the Stern layer thickness, were very high for the SI surfaces and increased with decreasing ionic strength. A different behaviour was showed by AI and Fe hydroxides; in these cases δ values were very low and increased with increasing electrolyte concentration. These results were discussed in terms of surface structures and activity of the supporting electrolyte.

Item Type:Article
ID Code:1925
Uncontrolled Keywords:Mineral surfaces, zpc, chemical potential, ions
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/13 Chimica agraria
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze ambientali agrarie e biotecnologie agro-alimentari
Publisher:Università degli studi di Sassari, Facoltà di Agraria - Gallizzi
Publisher Policy:Depositato per gentile concessione dell'Editore Gallizzi
Deposited On:18 Aug 2009 10:06

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