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Venerdì, 10 Febbraio 2012 13:11

CONTRIBUTION OF TOTAL SUSPENDED PARTICULATE (TSP) TO THE FORMATION OF BLACK CRUSTS ON BUILDING MATERIALS IN URBAN ENVIRONMENTS OF SICILY (ITALY)

Luciana Randazzo
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CONTRIBUTION OF TOTAL SUSPENDED PARTICULATE (TSP) TO THE FORMATION OF BLACK CRUSTS ON BUILDING MATERIALS IN URBAN ENVIRONMENTS OF SICILY (ITALY)

Luciana Randazzo*

* University of Palermo, Italy (Questo indirizzo email è protetto dagli spambots. È necessario abilitare JavaScript per vederlo.)

Abstract
The blackening of building material surfaces constitutes one of the major stone decay processes to be faced in the field of conservation of the Cultural Heritage. In this context, the increasing requirement to preserve the monumental and historical heritage put forward to consider the economic advantages in applying preventive actions instead of expensive restoration interventions. This contribution has been focused on the weathering agents that caused permanent damages of the historical buildings in Palermo and Catania, that are the biggest towns of Sicily, representing a fitting example of the “coastal Mediterranean city” where pollution due to road traffic prevails on industrial emissions. In order to discriminate between natural and anthropogenic contribution to the processes of stone decay, TSP (Total Suspended Particulate) and black crusts were sampled in both the urban areas and subjected to mineralogical, chemical and isotopic analyses. Samples were analysed by means of X-ray diffractometry (XRD), Fourier transformed infrared spectroscopy (FTIR), observation of thin sections through the polarizing microscope (MO), micro-morphological and chemical analysis through Scanning Electron Microscopy (SEM), dosing of soluble salts by liquid chromatography (IC) and measures of 34S/32S by mass spectrometry (MS). The chemical and isotopic characterization of TSP, with some insights into the identification of the main sources, has been obtained. Air quality in the urban area of Palermo is mainly due to vehicle exhaust emissions while Catania episodically also suffers the presence of Mt. Etna. The investigation demonstrates also how composition of black crusts reflects that of the atmospheric combustion sources. The data obtained can provide useful indications for a correct partitioning of pollutant sources and the identification of the threshold levels required for a sustainable protection and conservation of the Cultural Heritage.
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Letto 1526 volte Ultima modifica il Giovedì, 12 Febbraio 2015 17:32

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