ABSTRACT

Autotrophic microorganisms, such as algae and cyanobacteria, and heterotrophic microorganisms, such as bacteria and fungi, all of which are associated with biofilms present on the facade of the National Museum of Colombia. The preferred chemical treatment used to prevent or control microbiological corrosion is that which involves use of biocides, such as hydrogen peroxide, chloride, sodium hypochlorite, Dimanin and glutaraldehyde. The chemical analysis was performed at Universidad Externado de Colombia. In order to determine the ideal concentration of biocide for each microorganism, a variance analysis and a statistical significance test were performed. The effect of biocide on the three types of material was visually assessed, based on the changes in characteristics, such as colour, consistency and texture. Sulfate-reducing bacteria were observed in the samples taken from brick and stone; these samples contain sulfates and are adequate for the development of sulfate-reducing bacteria.