Lichens on asbestos–cement roofs: Bioweathering and biocovering effects

Asbestos–cement roofs, the most widespread sources of airborne, toxic and carcinogenic asbestos fibres, are often colonized by lichens. Since these latter are physical and chemical weathering agents, they have been often considered as significant responsible of disaggregation processes increasing fi...

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Bibliographic Details
Published in:Journal of hazardous materials 2009-03, Vol.162 (2), p.1300-1308
Main Authors: Favero-Longo, S.E., Castelli, D., Fubini, B., Piervittori, R.
Format: Article
Language:English
Subjects:
Acarospora cervina
Applied sciences
Asbestos
Asbestos–cement
Biocovering
Bioweathering
Candelariella
Construction Materials
Exact sciences and technology
Image analysis
Lichen
Lichens
Microscopy, Electron, Scanning
Pollution
X-Ray Diffraction
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Summary:Asbestos–cement roofs, the most widespread sources of airborne, toxic and carcinogenic asbestos fibres, are often colonized by lichens. Since these latter are physical and chemical weathering agents, they have been often considered as significant responsible of disaggregation processes increasing fibre dispersion. Consequently, official guidelines for the management of asbestos often suggest their removal. Weathering and/or covering effects of lichens on asbestos–cement, however, have never been deeply investigated and available procedures to evaluate asbestos–cement aging do not take the biological colonization into account. In this study we show that a 25% lichen cover modifies physical and chemical properties of asbestos–cement sheets containing chrysotile and crocidolite fibres. By innovatively coupling pull up tests and image analysis of linear structures, we show that fibre loss is significantly lower (∼30%) where lichens develop and offer a physical barrier to the fibre detachment. Below the most covering lichens ( Acarospora cervina, Candelariella ssp.), chrysotile and crocidolite undergo a partial incongruent dissolution, which in laboratory assays generally determined a reduction of their surface reactivity. Because of their biocovering and bioweathering effects, lichens on asbestos–cement play a role which differs from the current public opinion and the assumptions of some official regulations, acting as effective spontaneous bioattenuation agents.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2008.06.060