Analysis of Respirable Coal Mine Dust Samples by Infrared Spectroscopy.
Parobeck-P; Ainsworth-S; Tomb-T
NIOSH 1990 Nov:1142-1147
The United States Congress realized the hazard associated with coal miners' exposure to quartz (14808607) and, when issuing the Coal Mine Health and Safety Act (MHSA) of 1969 and the subsequent Coal MHSA of 1977, stipulated that exposure to quartz be controlled. Exposure to quartz has been controlled by reducing the applicable dust standard when the dust was observed to contain quartz levels in excess of 5%. To determine the quartz content of respirable coal mine dust, MSHA used an infrared spectrophotometer to measure the absorbance of infrared energy by quartz in a dust sample. This analysis was conducted following the destruction of the combined sample and filter matrix by a low temperature ashing process and subsequent filter redeposition of the ash containing the quartz. Since the mineral kaolinite (1318747) was observed to interfere with the quartz determination, a correction was made to the result obtained. The authors conclude that in order to automate the processing of samples and obtain a lower level of detection, the use of a Fourier transform infrared spectrophotometer to analyze coal mine dust for quartz content is being investigated. It is anticipated that a quartz mass of 10 micrograms will be detectable in respirable dust samples with masses as small as 0.2 milligrams.
Air-quality-monitoring; Airborne-dusts; Silica-dusts; Mineral-dusts; Dust-inhalation; Workplace-studies; Coal-dust;
DHHS (NIOSH) Publication No. 90-108
Proceedings of the VIIth International Pneumoconioses Conference