Airborne Concentrations of Chrysotile Asbestos in Serpentine Quarries and Stone Processing Facilities in Valmalenco, Italy

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Andrea Cattaneo1,*, Anna Somigliana2, Mauro Gemmi3, Ferruccio Bernabeo4, Domenico Savoca5, Domenico M. Cavallo6 and Pier A. Bertazzi1,7

1Department of Occupational and Environmental Health, Università degli Studi di Milano, Milan, Italy

2Environmental Protection Agency of Lombardy Region (ARPA), Milan, Italy

3Department of Earth Sciences ‘Ardito Desio’, Università degli Studi di Milano, I-20133 Milano, Italy

4Occupational Health Unit, Hospital of Lecco, I-23900 Lecco, Italy

5Direzione Generale Qualità dell’Ambiente, Lombardy Region, I-20124 Milano, Italy

6Department of Science and High Technology, Università degli Studi dell’Insubria, I-22100 Como, Italy

7Unit of Epidemiology, Fondazione IRCCS Ca’ Granda–Ospedale Maggiore Policlinico, I-20122 Milano, Italy ?* Author to whom correspondence should be addressed. Tel: +39-0250320147; fax: +39-0250320111; e-mail: andrea.cattaneo{at}unimi.it Received June 8, 2011. Accepted November 17, 2011. Asbestos may be naturally present in rocks and soils. In some cases, there is the possibility of releasing asbestos fibres into the atmosphere from the rock or soil, subsequently exposing workers and the general population, which can lead to an increased risk of developing asbestos-related diseases. In the present study, air contaminated with asbestos fibres released from serpentinites was investigated in occupational settings (quarries and processing factories) and in the environment close to working facilities and at urban sites. The only naturally occurrence of asbestos found in Valmalenco area was chrysotile; amphibole fibres were never detected. An experimental cut-off diameter of 0.25 µm was established for distinguishing between Valmalenco chrysotile and antigorite single fibres using selected area electron diffraction analyses. Air contamination from chrysotile fibres in the examined occupational settings was site-dependent as the degree of asbestos contamination of Valmalenco serpentinites is highly variable from place to place. Block cutting of massive serpentinites with multiple blades or discs and drilling at the quarry sites that had the highest levels of asbestos contamination generated the highest exposures to (i.e. over the occupational exposure limits) asbestos. Conversely, working activities on foliated serpentinites produced airborne chrysotile concentrations comparable with ambient levels. Environmental chrysotile concentrations were always below the Italian limit for life environments (0.002 f ml-1), except for one sample collected at a quarry property boundary. The present exposure assessment study should encourage the development of an effective and concordant policy for proper use of asbestos-bearing rocks and soils as well as for the protection of public health.

© The Author 2012. Published by Oxford University Press on behalf of the British Occupational Hygiene SocietyThis ArticleAnn Occup Hyg (2012) 56 (6): 671-683. doi: 10.1093/annhyg/mer119 First published online: January 2, 2012 Current Issue
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Posted in: Airborne, Asbestos, Chrysotile, concentrations, Facilities, Italy, Processing, Quarries, Serpentine, Stone, Valmalenco