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Surface complexation of calcium minerals in aqueous solution: 1. Surface protonation at fluorapatite-water interfaces
Luleå tekniska universitet.
University of Bern.
1991 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 147, no 1, p. 178-185Article in journal (Refereed) Published
Abstract [en]

The amphoteric properties of hydrous fluorapatite surfaces have been investigated. The measurements were performed as potentiometric titrations in 0.1M NaCl medium at 25°C using a glass electrode. The experimental data could be explained by a model that assumes the surface equilibria equivalent P-O- + H+ = equivalent P-OH log β101s(int.) = 6.6 ± 0.1 (3σ) equivalent Ca-OH2+ - H+ = equivalent Ca-OH log β-110s(int.) = -9.7 ± 0.1 (3σ). The equilibrium constants were evaluated using the computer program FITEQL by Westall (Report 82-01, Department of Chemistry. Oregon State University, Corvallis, 1982), assuming a constant capacitance model for the electric double layer. The acidity constants result in a value of log [H+]pzc = -8.15, which shifts to log [H+]pzc = -7.13 upon exposure to atmospheric carbon dioxide

Place, publisher, year, edition, pages
1991. Vol. 147, no 1, p. 178-185
National Category
Physical Chemistry
Research subject
Chemistry of Interfaces
Identifiers
URN: urn:nbn:se:ltu:diva-4374DOI: 10.1016/0021-9797(91)90145-XLocal ID: 25129020-ff12-11dc-8b65-000ea68e967bOAI: oai:DiVA.org:ltu-4374DiVA: diva2:977239
Note
Godkänd; 1991; 20080331 (cira)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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