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Dissolution kinetics of chrysotile at pH 7 to 10

Bales, Roger C. and Morgan, James J. (1985) Dissolution kinetics of chrysotile at pH 7 to 10. Geochimica et Cosmochimica Acta, 49 (11). pp. 2281-2288. ISSN 0016-7037. doi:10.1016/0016-7037(85)90228-5.

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The rate of chrysotile dissolution over five days was studied in constant-pH, batch suspensions at 25°C. After the first day, release of Mg occurred at a constant rate and exhibited a fractional dependence on pH, [H⁺]^(0.24). Interpreted in terms of a site-binding model for adsorption of protons on the surface. this fractional dependence implies that the rate is limited by a chemical reaction involving less than one adsorbed proton per Mg released into solution. The actual magnitude of the rate (10^(-15.7) mol cm⁻¹ s⁻¹ at pH 8) supports this interpretation. The inorganics NO³⁻, Cl⁻, HCO₃⁻ and SO₄⁻² and the organics catechol and oxalate affected the rate of Mg release only during the initial 12 to 24 hours of each experiment. Silica release was linear from the outset of each experiment, but showed no definite pH dependence.

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Additional Information:© 1985 Pergamon Press Ltd. Received November 26, 1984; accepted in revised form July 18. 1985. This research was supported by a grant from the Andrew W. Mellon Foundation to the California Institute of Technology's Environmental Quality Laboratory and by a grant from The Metropolitan Water District of Southern California. We have benefited from discussions with W. Stumm, M. Hoffmann and Y. Zutić. Editorial handling: T. Pačes.
Group:Environmental Quality Laboratory
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Andrew W. Mellon FoundationUNSPECIFIED
Metropolitan Water District of Southern CaliforniaUNSPECIFIED
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Other Numbering System NameOther Numbering System ID
Environmental Quality LaboratoryA-179
Issue or Number:11
Record Number:CaltechAUTHORS:20140915-153828901
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Official Citation:Roger C. Bales, James J. Morgan, Dissolution kinetics of chrysotile at pH 7 to 10, Geochimica et Cosmochimica Acta, Volume 49, Issue 11, November 1985, Pages 2281-2288, ISSN 0016-7037,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49731
Deposited On:16 Sep 2014 17:55
Last Modified:10 Nov 2021 18:47

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