DOI: 10.1346/ccmn.1988.0360502. Relative Solubility of Corundum, Gibbsite, Boehmite, and Diaspore at Standard State Conditions

Relative Solubility of Corundum, Gibbsite, Boehmite, and Diaspore at Standard State Conditions

10.1346/ccmn.1988.0360502

Crossref journal-article

Cambridge University Press (CUP)

Clays and Clay Minerals (56)

Abstract

AbstractThe solubilities of HCl-treated samples of corundum, gibbsite, boehmite, and diaspore in aqueous solutions at 298 K and one atmosphere pressure were determined from undersaturated and supersaturated initial conditions. Solution characteristics at apparent equilibrium were measured and used to calculate equilibrium constants (Kr) for mineral dissolution reactions: $$\begin{array}{l} A{l_2}{O_3}\left( {corundum} \right) + 3{H^ + } = A{l^3} + 1.5\,{H_2}O,\\ Al{\left( {OH} \right)_3}\left( {gibbsite} \right) + 3{H^ + } = A{l^3} + 3\,{H_2}O,\\ and\\ AlOOH\left( {boehmite\,or\,diaspore} \right) + 3{H^ + } = A{l^3} + 2{H_2}O, \end{array}$$ Assuming solid phase and water activities of unity, log Kr = 3pH - pAl3+ for all three equations. The calculated log Kr values were: 9.01 ± 0.05 (corundum), 7.76 ± 0.14 (gibbsite), 7.49 ± 0.09 (boehmite), and 6.75 ± 0.24 (diaspore), indicating that the relative thermodynamic stabilities under the experimental conditions were: corundum < gibbsite < boehmite < diaspore. The gibbsite value agreed well with that determined independently by another research group using acid-treated subsamples of the same source mineral (7.70 ± 0.02). The calculated Gibbs free energies of formation (kJ/mole) were: -1587.4 ± 2.1 (corundum), -1156.7 ± 1.6 (gibbsite), -921.0 ± 1.5 (boehmite), and -925.1 ± 2.0 (diaspore). The Δ Gfo values of the acid-treated minerals were 1.8 to 12.4 kJ/mole more negative than values recently compiled for untreated mineral samples. This result is attributed to the removal of reactive surface coatings that isolated the bulk mineral phases from the solution phase.

Bibliography

Peryea, F. J., & Kittrick, J. A. (1988). Relative Solubility of Corundum, Gibbsite, Boehmite, and Diaspore at Standard State Conditions. Clays and Clay Minerals, 36(5), 391â396.

Authors 2

F. J. Peryea (first)
J. A. Kittrick (additional)

References 19 Referenced 50

{'volume-title': 'The Environmental Chemistry of Aluminum', 'year': '1988', 'author': 'Hemingway', 'key': 'S000986040001510X_CR6'} / The Environmental Chemistry of Aluminum by Hemingway (1988)
{'key': 'S000986040001510X_CR14', 'first-page': '83', 'volume-title': 'The Thermodynamics of Soil Solutions', 'author': 'Sposito', 'year': '1981'} / The Thermodynamics of Soil Solutions by Sposito (1981)
10.1016/0016-7037(79)90224-2
10.1016/0016-7037(87)90107-4
10.2475/ajs.285.10.865
10.1346/CCMN.1982.0300405
10.2475/ajs.278.7.1018
10.1007/978-1-4612-5683-0_9
{'key': 'S000986040001510X_CR11', 'first-page': '118', 'volume-title': 'Chemical Equilibria in Soils', 'author': 'Lindsay', 'year': '1979'} / Chemical Equilibria in Soils by Lindsay (1979)
{'key': 'S000986040001510X_CR7', 'first-page': '99', 'volume-title': 'Minerals in Soil Environments', 'author': 'Hsu', 'year': '1977'} / Minerals in Soil Environments by Hsu (1977)
{'key': 'S000986040001510X_CR8', 'first-page': '326', 'article-title': 'Diaspore recrystallized at low temperature', 'volume': '63', 'author': 'Keller', 'year': '1978', 'journal-title': 'Amer. Mineral.'} / Amer. Mineral. / Diaspore recrystallized at low temperature by Keller (1978)
10.2136/sssaj1966.03615995003000050018x
{'key': 'S000986040001510X_CR3', 'first-page': '114', 'volume-title': 'Introduction to Statistical Analysis', 'author': 'Dixon', 'year': '1969'} / Introduction to Statistical Analysis by Dixon (1969)
{'key': 'S000986040001510X_CR19', 'first-page': '20', 'article-title': 'Oxides and hydroxides of aluminum', 'volume': '19', 'author': 'Wefers', 'year': '1972', 'journal-title': 'Alcoa Research Labs. Tech. Paper'} / Alcoa Research Labs. Tech. Paper / Oxides and hydroxides of aluminum by Wefers (1972)
10.1016/0016-7037(78)90024-8
10.1016/0016-7037(87)90172-4
10.1346/CCMN.1980.0280507
10.2136/sssaj1984.03615995004800050049x
10.2136/sssaj1980.03615995004400010029x

Dates

Type	When
Created	19 years ago (Aug. 25, 2006, 3:39 a.m.)
Deposited	2 weeks, 6 days ago (Aug. 12, 2025, 4:03 a.m.)
Indexed	2 weeks, 4 days ago (Aug. 14, 2025, 10:09 p.m.)
Issued	36 years, 11 months ago (Oct. 1, 1988)
Published	36 years, 11 months ago (Oct. 1, 1988)
Published Online	1 year, 4 months ago (April 2, 2024)
Published Print	36 years, 11 months ago (Oct. 1, 1988)

Funders 0

None

BibTeX

@article{Peryea_1988, title={Relative Solubility of Corundum, Gibbsite, Boehmite, and Diaspore at Standard State Conditions}, volume={36}, ISSN={1552-8367}, url={http://dx.doi.org/10.1346/ccmn.1988.0360502}, DOI={10.1346/ccmn.1988.0360502}, number={5}, journal={Clays and Clay Minerals}, publisher={Cambridge University Press (CUP)}, author={Peryea, F. J. and Kittrick, J. A.}, year={1988}, month=oct, pages={391–396} }

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