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This article in SSSAJ

  1. Vol. 44 No. 1, p. 139-142
    Received: Dec 18, 1978
    Accepted: Oct 3, 1979

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Gibbsite and Kaolinite Solubilities by Immiscible Displacement of Equilibrium Solutions1

  1. J. A. Kittrick2



A major drawback of mineral stability determinations by the solubility method has been that oftentimes years are required to reach equilibrium. Minimum equilibration times require that minimum amounts of solution be equilibrated with maximum amounts of mineral. Thus, about 10 ml of solution was displaced from about 10 g of mineral with carbon tetrachloride, after mineral and solution were equilibrated for a few days to a few weeks.

Agreement was excellent between the immiscible displacement, long-term solubility, and calorimetric methods for determining gibbsite solubility. Agreement between the immiscible displacement and long-term solubility methods was also reasonably good for two kaolinite and for gibbsite-kaolinite mixtures. The small volumes of solution involved in the immiscible displacement method reach equilibrium at least an order of magnitude faster than the larger volumes required for long-term solubility studies.

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