PLM-PCM METHOD FOR IDENTIFICATION OF ASBESTOS CONTAINING MATERIALS
Journal Title: Българско списание за обществено здраве (Bulgarian Journal of Public Health) - Year 2016, Vol 0, Issue 1
Abstract
Asbestos is a proven human carcinogen (Group A1), widely used in the twentieth century and banned in the European Union, including Bulgaria from 2005 (Regulation (EC) 1907/2006). The currently available asbestos containing materials (ACMs) in buildings, constructions and installations pollute the environment and determine the risk of asbestos exposure. The first necessary step to solve the problem in accordance with current legislation is the reliable identification of existing ACMs, determining the type of asbestos and assessing its contents according to approved by Council Regulation №1272/2008 quantitative criterion - 0,1 mass %. The standard opto-chemical method (BSS 16910- 88/1989) for the identification of asbestos is a qualitative and non-selective one to distinguish asbestos from other fibrous particles with similar refractive indexes (IR) and chemical resistance, particularly at low asbestos content. PCM-PLM method has been developed by combining the used until now Phase-Contrast Microscopy (PCM) with the world-recognized method of Polarised Light Microscopy (PLM) and introduction of quantitative techniques for chemical processing for removal of the matrix of the material, preparation and analyzing samples to determine the low asbestos content. The identification is performed by a complex of morphological and optical properties of asbestos. Its quantity is determined by comparison with artificial mixtures containing 0,1 mass % of the same type of asbestos or by measurement and calculation of the mass of fibers of the filter membrane. The limit of determination is 0,1 mass %, a standard deviation of repeatability – 27,7 rel. %.
Authors and Affiliations
Savina Dimitrova, Radka Lukanova
Keywords
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