A surface complex reaction model for the pH-dependence of corundum and kaolinite dissolution rates

Journal Article · Mon Oct 31 23:00:00 EST 1988 · Geochimica et Cosmochimica Acta; (USA)

DOI:https://doi.org/10.1016/0016-7037(88)90030-0· OSTI ID:7017983

Carroll-Webb, S A; Walther, J V ^[1]

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1. Northwestern Univ., Evanston, IL (USA)

Comparison of experimental and theoretical potentiometric titrations of kaolinite at 25{degree}C indicates that the adsorption of H{sup +} and OH{sup {minus}} ions to the mineral surface are metal cation specific and that the net adsorption can be modeled in terms of the constituent oxide components. The authors conclude, from the potentiometric, electrophoretic, and dissolution rate data presented in this paper, that the pH-dependence of the dissolution rates of slightly soluble oxide and silicate minerals is controlled by the adsorption of H{sup +} and OH{sup {minus}} ions to specific metal cation surface reaction sites.

• OSTI ID: 7017983
• Journal Information: Geochimica et Cosmochimica Acta; (USA), Journal Name: Geochimica et Cosmochimica Acta; (USA) Vol. 52:11; ISSN GCACA; ISSN 0016-7037
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400202 -- Isotope Effects
Isotope Exchange
& Isotope Separation
58 GEOSCIENCES
580000* -- Geosciences
ADSORPTION
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
ALUMINIUM SILICATES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CORUNDUM
DISSOLUTION
ION EXCHANGE
KAOLINITE
KINETICS
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PH VALUE
REACTION KINETICS
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
SORPTION
SURFACE PROPERTIES