Black coatings were detected on granite surfaces in groundwater catch work tunnels from Porto city (NW Portugal). XRD, FTIR, Micro-Raman, ICP-MS, TEM-EDS, SEM-EDS and SEM-FIB were the analytical procedures carried out to investigate the origin of the black coatings. In this subterranean environment, the enrichment in metals and other trace elements, such as Mn and Fe, and clay minerals characterize the black mi...
Os filmes negros desenvolvem-se sobre substrato granítico com morfologia idêntica ao mesmo. A sua eliminação requer métodos abrasivos e/ou químicos por forma a superar a impermeabilidade e dureza característica. A génese de formação dos filmes negros é o elemento fundamental para contribuir para a preservação e sustentabilidade do património construído granítico na perspectiva de minimizar o seu desenvolvimento...
This study is aimed to assess the formation of photosynthetic biofilms on and within different natural stone materials, and to analyse their biogeophysical and biogeochemical deterioration potential. This was performed by means of artificial colonisation under laboratory conditions during 3 months. Monitoring of microbial development was performed by image analysis and biofilm biomass estimation by chlorophyll ...
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