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Aqueous Surface Chemistry of Asbestos Minerals.


PB90100942

Publication Date 1973
Personal Author Smith, R. W.
Page Count 20
Abstract Physicochemical study of the manner in which hydroxyl and other ions leave the surfaces of asbestos minerals as a function of aging time in water is presented. 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
  • Surface chemistry
  • Asbestos
  • Minerals
  • Physicochemical properties
  • Electrokinetics
  • Grants
  • Water
  • Adsorption
  • Electron microscopy
  • pH
  • Laboratory animals
  • Ions
  • Silicon dioxide
  • Magnesium hydroxides
  • Dissolution
  • Reaction kinetics
  • Carcinogens
  • Occupational safety and health
  • Aqueous solutions
  • Hydroxyl radicals
Source Agency
  • National Institute for Occupational Safety and Health
NTIS Subject Category
  • 99F - Physical & Theoretical Chemistry
  • 68G - Environmental Health & Safety
  • 57U - Public Health & Industrial Medicine
Corporate Authors Nevada Univ., Reno.; National Inst. for Occupational Safety and Health, Cincinnati, OH.
Supplemental Notes Sponsored by National Inst. for Occupational Safety and Health, Cincinnati, OH.
Document Type Technical Report
Title Note Progress rept. (Final) 1 Sep 69-28 Apr 73.
NTIS Issue Number 199002
Aqueous Surface Chemistry of Asbestos Minerals.
Aqueous Surface Chemistry of Asbestos Minerals.
PB90100942

  • Surface chemistry
  • Asbestos
  • Minerals
  • Physicochemical properties
  • Electrokinetics
  • Grants
  • Water
  • Adsorption
  • Electron microscopy
  • pH
  • Laboratory animals
  • Ions
  • Silicon dioxide
  • Magnesium hydroxides
  • Dissolution
  • Reaction kinetics
  • Carcinogens
  • Occupational safety and health
  • Aqueous solutions
  • Hydroxyl radicals
  • National Institute for Occupational Safety and Health
  • 99F - Physical & Theoretical Chemistry
  • 68G - Environmental Health & Safety
  • 57U - Public Health & Industrial Medicine
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