Microbial growth and air pollutants in the corrosion of carbonate building stone: results of laboratory and outdoor experimental tests |
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| Authors: | B Moroni L Pitzurra G Poli |
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| Institution: | (1) Department of Earth Sciences, Department of Experimental and Biochemical Sciences, University of Perugia, Italy |
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| Abstract: | The combined effect of microbial colonization by fungal growth and atmospheric pollutants in the sulfation of carbonate rocks was investigated by means of laboratory experiments of dry deposition of sulfur and nitrogen dioxides, in vitro microbiological assays and outdoor exposure tests. All the experiments were performed on Scaglia limestone, which is a very common building material in ancient monuments in Central Italy. Results point to a combined action of particulate matter deposition and sulfation in the formation of gypsum on the samples exposed outdoor, and to a significant influence of fungal growth in the conversion of metal sulfide particulate matter to sulfate thus promoting subsequent formation of gypsum also in the absence of pollution. The chemical and textural features of stone tend to enhance chemical weathering and fungal colonization in the short term, and to preserve the material in the long term. |
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| Keywords: | Dry deposition Microbial build-up Scaglia limestone Sulfation X-ray diffraction |
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