Author(s)

M. Macchiarola, C. Sabbioni, G. Zappia, C. Riontino & G. Gobbi

Abstract

Samples of black crusts and their stone supports (fine-yellow calcarenite) were collected from ancient buildings situated on Ortigia island, the historic centre of Siracusa (Sicily). In order to identify the deterioration products and define the origin of atmospheric deposition, the specimens were examined by means of several analytical methodologies: optical and electron microscopy (OM and SEM-EDAX), X-ray diffractometry (XRD), thermal analyses (TGA-DTA), ion chromatography (1C) and elemental analyses by combustion (CHNSO). The data point to an important sulphation process due to SC>2 deposition on the building surfaces. Sublam

Keywords