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1	Clay occlusion of respirable quartz particles detected by low voltage scanning electron microscopy-x-ray analysis
Authors	Wallace-WE; Harrison-J; Keane-MJ; Bolsaitis-P; Eppelsheimer-D; Poston-J; Page-SJ
Source	Ann Occup Hyg 1990 Apr; 34(2):195-204
Link	http://dx.doi.org/10.1093/annhyg/34.2.195
NIOSHTIC No.	00195640
Abstract	The aluminum (7429905) and silicon (7440213) content of respirable sized dust particles from a clay mine and mill were examined by scanning electron microscopy/energy dispersive x-ray analysis at incident electron energies of 5 to 20 kiloelectron volts (KeV). The high silica content particles, with a silicon to silicon plus aluminum signal fraction of 0.9 or greater measured at 20keV, demonstrated a decrease in the silicon fraction of signal with decreasing incident electron energy, down to values between 0.6 and composition. The authors conclude that this behavior may be due to a heterogeneous particle structure in which an aluminosilicate coating occludes the surface of a silica particle core. The coating was observed to survive incubation in a major component of pulmonary surfactant.
Keywords	NIOSH-Author; Chemical-analysis; Analytical-chemistry; Mineral-dusts; Microscopic-analysis; Silica-dusts; Mining-industry; Respirable-dust

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