The Quantitative Dermination of Quartz in Coal Dust by Infrared Spectroscopy

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Abstract
The quantitative determination of quartz in airborne coal dust by an infrared spectrometric procedure is described. The coal dust is collected on mixed cellulose ester membrane filters. The method includes ashing the filters in a low-temperature asher, preparing a potassium bromide pellet of the ash, and obtaining the infrared spectrum from 900 cm to 700 cm-1. The absorbance at 800 cm-1 is calculated and the weight of quartz is determined from a standard curve. Possible interferences from kaolin and limestone have been studied. The method is applicable for a range of 10 to 100 µg of quartz. An average sample is estimated to have 1 to 2 mg of coal dust on the filter. If the sample contains approximately 5% quartz, it will fall within the indicated range.

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