The effects of naturally occurring acids on the surface properties of chrysotile asbestos

Chrysotile asbestos is considered an environmental health hazard. It is postulated that the surface of chrysotile, with its inherent positive charge and chemical content of trace transition metals within the mineral is a causative factor of the concern. Weathering may reduce the negative health effe...

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Bibliographic Details
Published in:Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering Toxic/hazardous substances & environmental engineering, 2014-10, Vol.49 (12), p.1445-1452
Main Authors: Holmes, Emma P., Lavkulich, L.M. (Les)
Format: Article
Language:English
Subjects:
Acids
Asbestos
Asbestos, Serpentine - chemistry
Carbonic acid
Chelating Agents - chemistry
Chrysotile
Earth sciences
Earth, ocean, space
Effects
electron microscopy
Environmental health
Exact sciences and technology
Geologic Sediments - chemistry
Health
Mineralogy
Mining
Oxalic Acid - chemistry
Rivers - chemistry
Sediments
Serpentinitic sediments
Silicates
Streams
surface chemistry
surface composition
Surface properties
Trace elements
Trace Elements - chemistry
Weather
Weathering
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Summary:Chrysotile asbestos is considered an environmental health hazard. It is postulated that the surface of chrysotile, with its inherent positive charge and chemical content of trace transition metals within the mineral is a causative factor of the concern. Weathering may reduce the negative health effects of chrysotile asbestos, by alteration of the outer brucite layer of the chrysotile. To assess the changes in the surface properties of chrysotile asbestos by simulated weathering, chrysotile was treated with oxalic, hydrochloric, and carbonic acids. Naturally occurring chrysotile, from a mine site and serpentinitic stream sediments from the Sumas River were analyzed and compared. Oxalic acid, a chelating acid, was the most effective at extracting the majority of the trace elements present in the chrysotile, reducing their positive surface charge and producing visible changes at the surface of the fibers as shown by Field Emission Scanning Electron Microsopy (FESEM). Carbonic acid had little effect on the surface properties. Stream environments had minor detectable effects on the surface properties on the chrysotile stream sediments.
ISSN:1093-4529
1532-4117
DOI:10.1080/10934529.2014.928558