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Aqueous surface chemistry of asbestos minerals.

Authors
Smith-RW
Source
University of Nevada, Reno, Nevada, 1973 Apr; :1-18
Link
NIOSHTIC No.
00033499
Abstract
Physicochemical study of the manner in which hydroxyl and other ions leave the surfaces of asbestos mineral as a function of aging time in water. In relatively pure water systems a parallelism is noted between magnesium dissolution and pH change for all asbestos minerals studied. The magnesium and hydroxyl dissolution reactions are diffusion controlled. Silica is more readily dissolved from crocidolite than from either chrysotile or amosite. Electrokinetic work shows that chrysotile placed in water initially has a surface approaching that of pure magnesium hydroxide, but after long aging in water the surface approaches that of nonasbestiform serpentine. Attempts made to relate pretreatment of asbestos fibers to carcinogenicity and fibrogenicity indicate that chrysotile appears more likely to induce tumors in rats than acid treated chrysotile or other asbestos minerals.
Keywords
NIOSH-Grant; Physical-chemistry; Ionization; Water-treatment; Surface-energy; Acidity; Carcinogens
Contact
Chemical & Metallurgical Engr University of Nevada Reno, Nev 89507
CAS No.
12001-28-4; 1332-21-4; 12001-29-5; 7439-95-4; 7631-86-9
Publication Date
19730428
Document Type
Final Grant Report
Funding Amount
134372
Funding Type
Grant
Fiscal Year
1973
NTIS Accession No.
PB90-100942
NTIS Price
A03
Identifying No.
Grant-Number-R01-OH-00332
NIOSH Division
OEP
Source Name
University of Nevada, Reno, Nevada, Final Progress Report for Grant R01-OH-00332, 18 pages, 23 references
State
NV
Performing Organization
University of Nevada Reno, Reno, Nevada
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