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Surface charge and adsorption properties of chrysotile asbestos in natural waters

Bales, Roger C. and Morgan, James J. (1985) Surface charge and adsorption properties of chrysotile asbestos in natural waters. Environmental Science and Technology, 19 (12). pp. 1213-1219. ISSN 0013-936X. doi:10.1021/es00142a013.

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Changes in surface-charge adsorption properties of chrysotile asbestos aging in water were studied in a series of constant-pH laboratory experiments. Chrysotile freshly suspended in an inorganic electrolyte has a positive surface charge below pH 8.9. Charge reversal occurs within about 2 weeks due to more rapid dissolution of chrysotile's outer magnesium hydroxide surface relative to the underlying silica component of the mineral. The inorganic anions NO_3^-, Cl^-, HCO_3^- , and SO_4^(2-) did not absorb. A constant- capacitance model can be used to relate surface charge to adsorption of protons over the pH range 7-9. At natural organic matter (NOM) concentrations at or below those encountered in natural waters, the particles can adsorb sufficient organic matter within 1 day to acquire a negative charge. Adsorption of NOM reached a maximum of 30 x 10^(-6) mg of C cm^(-2) after 21 h; catechol continued to adsorb over 5 days.

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Additional Information:© 1985 by the American Chemical Society. Received for review November 21, 1984. Accepted June 24, 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.
Group:Environmental Quality Laboratory
Funding AgencyGrant Number
Andrew W. Mellon FoundationUNSPECIFIED
Metropolitan Water District of Southern CaliforniaUNSPECIFIED
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Other Numbering System NameOther Numbering System ID
Environmental Quality LaboratoryA-171
Issue or Number:12
Record Number:CaltechAUTHORS:20140702-085204252
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Official Citation:Surface charge and adsorption properties of chrysotile asbestos in natural waters Roger C. Bales and James J. Morgan Environmental Science & Technology 1985 19 (12), 1213-1219
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46619
Deposited By: Tony Diaz
Deposited On:02 Jul 2014 17:13
Last Modified:10 Nov 2021 17:28

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