Methods for quantitative analysis of asbestos in vermiculite-containing materials
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United States of America Patent
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Mar 22, 2016
Grant Date -
Dec 18, 2014
app pub date -
Jun 14, 2013
filing date -
Jun 14, 2013
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Abstract
A method for quantitative analysis of asbestos in vermiculite-containing materials includes a first embodiment which includes washing the sample with water or treating the sample with a low concentration acid to digest gypsum and carbonates, ashing the sample at a low temperature to remove cellulose, therefrom and analyzing the sample. Digestion may be effected before or after ashing. Subsequently, a second subsample may be ashed at low temperature to remove cellulose and refluxed with a concentrated acid followed by refluxing with a base and rinsing with deionized water to wash away gypsum, vermiculite and other soluble components. This is followed by analysis to determine asbestos concentration. In a further embodiment, the residue of the first embodiment may be employed as the second subsample.
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