Aluminosilicate surface contamination of respirable quartz particles from coal mine dusts and from clay works dusts.
Wallace WE; Harrison JC; Graysone RL; Keane MJ; Bolsaitis P; Kennedy RD; Wearden AQ; Attfield MD
Ann Occup Hyg, Inhaled Particles VII 1994 Jan; 38(Suppl 1):439-445
Respirable high-silica particles from four coal mines, a clay mine and a tunnelling site were analysed for silicon vs aluminum composition by performing scanning electron microscopy-energy dispersive X-ray analysis (SEM-EDS) at electron accelerating voltages of 20 kiloelectron volts (keY). The same particles were analysed at 5 keY to determine possible differences in surface vs bulk composition. In some cases high-silica particles exhibited a decrease in the ratio of silicon to aluminium K-alpha line intensities with decreasing electron beam accelerating voltage. This behaviour is consistent with aluminosilicate surface contamination or occlusion of a silica particle. Some 20 high-silica particles were analysed from each of 10 samples. Powdered aluminosilicate glass was used as a control for the behaviour of silica with a homogeneous distribution of aluminium in the particle. Significant differences were found between the control and sample means for an Illinois bituminous coal mine dust, two western and one central Pennsylvania bituminous coal mine dust low-temperature ashes, and a clay mine and mill dust sample, but not for an anthracite coal mine dust and two central Pennsylvania bituminous coal mine dust low-temperature ashes.
Silica-dusts; Silicate-miners; Silicates; Coal-miners; Coal-mining; Miners; Mining-industry; X-ray-analysis; Alpha-particles; Respirable-dust; Reproductive-hazards; Quartz-dust; Aluminum-compounds
Division of Respiratory Disease Studies, National Institute for Occupational Safety and Health, U.S. Centers for Disease Control, Morgantown, WV 26505 USA
Dodgson J; McCallum RI
Annals of Occupational Hygiene, Inhaled Particles VII