Research on the presence of sulphurcycle bacteria in the stone of some historical buildings in Florence
- 23 Downloads
The problem of the conservation of ancient buildings is often the conservation of stone. The decayed stone is exfoliated and contains in general a relatively high quantity of gypsum.
Fifty samples of deteriorated stones from buildings of the historic center of Florence were collected and examined. The gypsum percentage in the samples, determined by diffractometric analysis, varied between 0.5 and 10 per cent. The sulphur bacteria were in the range from 250 to 20,000 per g of stone. In spite of certain indications it is not possible to establish a direct correlation between gypsum content and number of sulphur bacteria.
KeywordsSulphur Plant Physiology Gypsum Historical Building Historic Center
Unable to display preview. Download preview PDF.
- 1.Malesani G. and Vannucci S., Ricerche sulla Degradazione delle Pietre. Acc. toscana di Scienze e Lettere, la Colombaria ed. L. S. Olschki Firenze (1974).Google Scholar
- 2.Parker C. D., Species of sulphur bacteria associated with the corrosion of concrete. Nature159, 439, (1947).Google Scholar
- 3.Pochon J. and Tardieux P., Techniques d'Analyse in Microbiologie du Soil. ed. de la Tourelle, St. Mardè, (1962).Google Scholar
- 4.Pochon J. and Jaton C., Facteur biologiques de l'alteration des pierres. Biodeterioration of materials. (H. Walters and J. J. Elphick eds.) Elsevier publishing Co. (1968).Google Scholar
- 5.Stambolov T. and Van Asperen de B. J., The Deterioration and Conservation of Pourous Buildings Materials in Monuments. ICOM Committee for Museum Laboratories. Brussels (1967).Google Scholar
- 6.Winkler E., Decay of Stone. Conservation of Stone 2° Ed. vol. 1 I.I.C. (1970).Google Scholar