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Kinetic study of dissolution of asbestos fibers in water.

Authors
Choi-I; Smith-RW
Source
J Colloid and Interface Sci 1972 Aug; 40(2):253-262
NIOSHTIC No.
20036832
Abstract
Kinetics of dissolution of asbestos minerals in water were studied over a temperature range of 5 to 45C. A parallelism was noted between the rate of dissolution of magnesium from magnesium silicates and the rate of pH drift. The rate of dissolution reaction was directly proportional to the specific surface area of the asbestos minerals. Both magnesium ion and hydroxyl ion concentrations were temperature-sensitive only in the initial stage of the contact between chrysotile mineral and water. The mechanism of dissolution of dissolved species from chrysotile was discussed in terms of the energy of activation. The activation enthalpies were calculated to be 5.5 and 6.5 kcal/mol for dissolution of magnesium and increasing of hydroxyl ion concentration, respectively. These results indicate that the rate controlling mechanism for both magnesium and hydroxyl ion dissolution is diffusion from the surface into water.
Keywords
Asbestos-fibers; Surface-properties; Surfactants; Temperature-effects; Water-analysis; Water-sampling
Contact
Department of Chemical and Metallurgical Engineering, Mackay School of Mines, University of Nevada, Reno, Nevada 89507
CODEN
JCISA5
CAS No.
1332-21-4; 7439-95-4
Publication Date
19720801
Document Type
Journal Article
Funding Amount
134372
Funding Type
Grant
Fiscal Year
1972
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-000332
Issue of Publication
2
ISSN
0021-9797
Priority Area
Other Occupational Concerns; Grants-other
Source Name
Journal of Colloid and Interface Science
State
NV
Performing Organization
University of Nevada Reno, Reno, Nevada
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