Release of asbestos fibers from weathered and corroded asbestos cement products
The controversy on whether weathered and corroded asbestos cement products are emitting biologically significant asbestos fiber concentrations in ambient air has not been resolved. Nor is it known if the weathered and corroded asbestos cement products release asbestos fibers which have the same carcinogenic potency as standard chrysotile. The purpose of this research project was to develop a method for sampling and measuring asbestos fiber emissions from solid planar surfaces (i.e., roofs and facades) consisting of asbestos cement products and to develop methods for studying the physical and chemical changes and the carcinogenic potency of the emitted fibers. Using this method asbestos fiber emissions in ambient air have been measured in the FRG during 1984/1986. The emissions of asbestos fibers longer than 5 microns were in the range 10(6) to 10(8) fibers/m2.hr. The ambient air concentrations of these asbestos fibers were for the most part less than 10(3) fibers/m3. It was shown that the emitted asbestos fibers were chemically changed and it was shown with animal experiments that their carcinogenic potency did not differ from the carcinogenicity of standard chrysotile fibers.
- Research Organization:
- Fraunhofer Institute for Environmental Chemistry and Ecotoxicology, Schmallenberg-Grafschaft (Germany, F.R.)
- OSTI ID:
- 6328720
- Journal Information:
- Environ. Res.; (United States), Vol. 48:1
- Country of Publication:
- United States
- Language:
- English
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63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ASBESTOS
AIR POLLUTION MONITORING
TOXICITY
AIR POLLUTION
CARCINOGENESIS
CHEMICAL PROPERTIES
CORROSION
ECOLOGICAL CONCENTRATION
MEASURING METHODS
PARTICLE SIZE
PHYSICAL PROPERTIES
RATS
SAMPLING
WEATHERING
ANIMALS
CHEMICAL REACTIONS
MAMMALS
PATHOGENESIS
POLLUTION
RODENTS
SIZE
VERTEBRATES
500200* - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)
560300 - Chemicals Metabolism & Toxicology