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http://dx.doi.org/10.15269/JKSOEH.2014.24.2.146

Assessment of Acid Solubility Test on Korean Asbestos by Transmission Electron Microscope Equipped with Energy Dispersive X-ray Spectrometer  

Chung, Yong Hyun (Toxicity Research Team, Occupational Safety and Health Research Institute, Korea Occupational Safety and Health Agency)
Han, Jeong Hee (Toxicity Research Team, Occupational Safety and Health Research Institute, Korea Occupational Safety and Health Agency)
Publication Information
Journal of Korean Society of Occupational and Environmental Hygiene / v.24, no.2, 2014 , pp. 146-151 More about this Journal
Abstract
Objectives: Chrysotile is mineralogically distinct from amphiboles, displaying a notably different chemical structure. The thin sheets that form chrysotile fiber lead to the ability of the lung/macrophage system to decompose the chrysotile fibers. This study was performed in order to compare the physicochemical characteristics of Korean asbestos with those of Canadian amphiboles. Materials: An acid solubility test for each test substance was done to compare pH 4.5 and pH 1.2 distilled water. Asbestos fibers which had been placed in acid solutions for five days, five weeks and weeks were analyzed with a transmission electron microscope equipped with an energy dispersive X-ray spectrometer (TEM-EDS). Results: The composition element (Mg) of Korean chrysotile, Korean anthophyllite and Canadian amosite significantly decreased from 5 days and also decreased significantly after 5 weeks and 10 weeks. Only the composition (Mg) of Canadian crocidolite did not change under any conditions. From 5 days, the Mg of Korean chrysotile, Korean anthophyllite and Canadian amosite were significantly lower than before the acid treatment, but there were no changes over time or by the pH of the acid solutions. Particularly after 10 weeks, the composition (Mg) of Korean chrysotile in the pH 1.2 acid solution showed a rapid reduction of 15.86%. Conclusions: Korean chrysotile was very weak in an acid environment, beginning to show significant changes after 5 days. The Mg component rapidly decreased after 10 weeks in the pH 1.2 acid solution.
Keywords
Acid solubility; Korean asbestos; transmission electron microscope equipped with energy dispersive X-ray spectrometer (TEM-EDS);
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