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.
Division of Respiratory Disease Studies, National Institute for Occupational Safety and Health, U.S. Centers for Disease Control, Morgantown, WV 26505 USA
CODEN
AOHYA3
CAS No.
14808-60-7; 7429-90-5
Publication Date
19940101
Document Type
Journal Article
Editors
Dodgson J; McCallum RI
Fiscal Year
1994
ISBN No.
0080408419
ISSN
0003-4878
NIOSH Division
DRDS
Source Name
Annals of Occupational Hygiene, Inhaled Particles VII
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