Manuela Catalano

Asbestos and other fibrous minerals contained in the serpentinites of the Gimigliano-Mount Reventino Unit (Calabria, S-Italy)

Serpentinites are metamorphic rocks with good technological properties and valuable ornamental characteristics, which have been exploited since ancient times. Actually, their use is limited and monitored in several countries worldwide because they can contain fibrous asbestos minerals that may be carcinogenic. Furthermore, certain types of fibrous minerals can be confused with asbestos, and must therefore be carefully investigated. We have investigated the possible presence of the asbestos and non-asbestos fibrous phases contained in serpentinitic rocks in a meta-ophiolitic sequence from the Gimigliano-Mount Reventino Unit (Southern Italy), which had not been previously assessed. The detection and quantification of asbestos and the correct distinction of the fibrous non-asbestos minerals are very important not only from a scientific point of view, but also from a legislative one. This is especially the case for the administrative agencies that have to take decisions with regards to the implementation of public and occupational health protection measures (e.g., in road yards and quarry excavations). As a consequence of this, serpentinitic rock samples have been characterized in detail through X-ray powder diffraction, scanning and transmission electron microscopy combined with energy-dispersive spectrometry, analytical electron microscopy (SEM–EDS and TEM–AEM), differential scanning calorimetry, thermogravimetry and micro-Raman spectroscopy. Two kinds of asbestos and four kinds of non-asbestos fibrous silicates have been detected in the examined samples. In order of decreasing abundance these are polygonal serpentine, chrysotile, fibrous antigorite, tremolite, gedrite and magnesiohornblende. The size, morphology, crystallinity and chemical composition of the fibres were also discussed, in the light of the possible role these properties could play in the carcinogenic effect on human health.

Naturally occurring asbestos (NOA) in rock and soil and relation with human activities: the monitoring example of selected sites in Calabria (southern Italy)

The major aim of our research is to assess the occurrence, within the serpentinites and serpentinite-derived soils located in the area of Sila Piccola (northern Calabria), of asbestiform minerals that could be potentially harmful for human health. At this purpose, nine serpentinite rock samples and three agricultural soils have been collected nearby two inhabited centres (Gimigliano and Conflenti towns) and characterized in detail by means of Polarized Light Microscopy (PLM), X-Ray Powder Diffractometry (XRPD), Scanning Electron Microscopy combined with Energy-Dispersive Spectrometry (SEM/EDS). Further characterization by Differential Scanning Calorimetry (DSC), Thermogravimetric (TG) and by μ-Raman spectroscopy (μ-R) have allowed the discrimination among the three serpentine polytypes. Serpentinites from Gimigliano mainly consist of lizardite, antigorite while chrysotile is the dominant asbestos phase in the samples from Conflenti. Moreover in both investigated sample groups asbestos tremolite- actinolite was also detected. Furthermore, high amounts of chrysotile and asbestos tremolite-actinolite were found in agricultural soils, suggesting that human activities can disturb and provoke the release of inhalable asbestos in the atmosphere, triggering thus mechanisms of hazardous exposition for population.

Naturally occurring asbestos: potential for human exposure, San Severino Lucano (Basilicata, Southern Italy)

In recent years, environmental exposure to naturally occurring asbestos (NOA) has been shown to be a cause of several types of lung disease, which may occur when NOA outcrops are in proximity to residential areas. In this study, we present the results of our investigation of NOA hosted in outcrops of serpentinites in Basilicata region (Southern Italy), which could be potentially harmful to human health. For this purpose, fifteen serpentinite rock samples collected within and near the village of San Severino Lucano were characterized in detail by optical microscope (OM), X-ray powder diffraction (XRPD), thermal analysis (TG/DSC/DTG/DDSC), scanning and transmission electron microscopy combined with energy-dispersive spectrometry, analytical electron microscopy (SEM/EDS and TEM/AEM). Chrysotile and asbestos tremolite or asbestos actinolite were identified in all samples. The NOA in these outcrops could be subject to weathering processes and/or human activities, which generate airborne particles, thus exposing the neighbouring populations to a series of health risks. The size and morphology of NOA are also discussed, regarding the carcinogenic effect that these factors may have on human health. Due to the health risks associated with disturbing NOA-bearing rock, an asbestos exposure control plan must be instituted.

Occurrence and characterization of asbestos minerals in the area of San Severino Lucano (Basilicata, Southern Italy)

Serpentinites are metamorphic rocks used for building and ornamental purposes since ancient times but they can contain asbestos minerals, thus currently their use is limited or banned in several countries. In this study we have investigated the possible presence of asbestos contained in the serpentinitic rocks outcropping near San Severino Lucano (Basilicata, Southern-Italy). Serpentinites have been characterized in detail combining different analytical techniques in order to detect asbestos minerals that maybe potentially harmful for human health.

Occurring asbestos in agricultural soils serpentinite-metabasite derivate (Calabria, southern Italy)

Since soils that developed on serpentinite-metabasite bedrocks could be rich in asbestos minerals which are known to have a negative impact on agricultural activity and on environmental quality, six agricultural soil samples close to the urban centers of Conflenti and Decollatura (Sila Piccola, Calabria) have been collected and characterized by using different analytical techniques.