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Gibbsite and Kaolinite Solubilities by Immiscible Displacement of Equilibrium Solutions
Author(s) -
Kittrick J. A.
Publication year - 1980
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1980.03615995004400010029x
Subject(s) - gibbsite , solubility , kaolinite , chemistry , mineral , mineralogy , thermodynamics , inorganic chemistry , organic chemistry , physics
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.