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Ann. occup. Hyg., Vol. 46, No. 7, pp. 609-615, 2002
© 2002 British Occupational Hygiene Society
Published by Oxford University Press

A Method for Determining Crystalline Silica in Bulk Samples by Fourier Transform Infrared Spectrophotometry

DAVE K. VERMA*, DIANE M. JOHNSON and KAREN DES TOMBE

Occupational and Environmental Health Laboratory, McMaster University, 1200 Main Street West, Hamilton, ON L8N 3Z5, Canada

Received 1 March 2002; in final form 27 June 2002

A method for determining crystalline silica ({alpha}-quartz) in bulk samples has been developed. This procedure requires the bulk sample to be homogenized and sieved down to particle sizes <10 µm in diameter. The obtained fraction is analysed by Fourier transform infrared spectrophotometry. Method validation was carried out using 55 real-world bulk samples, containing between 1 and 75% (w/w) {alpha}-quartz. The method is capable of quantifying {alpha}-quartz down to 1% (w/w) in routine analysis. However, the method is unlikely to allow routine quantification at 0.1% (w/w) as currently mandated by regulations.

Keywords: bulk silica; crystalline silica; Fourier transform infrared spectrophotometry; particle size; silica analysis


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