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Clay occlusion of respirable quartz particles detected by low voltage scanning electron microscopy, X-ray analisis

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24510‎$a‎Clay occlusion of respirable quartz particles detected by low voltage scanning electron microscopy, X-ray analisis‎$c‎W.E. Wallace... [et al.]
520  ‎$a‎Respirable-sized dust particles from a clay mine and mill were examined for aluminium and silicon content by scanning electron microscopy-energy dispersive X-ray analysis at incident electron energies of 5-20 keV. Most of the high silica content particles, those which had a silicon to silicon plus aluminium signal fraction, measured at 20 keV, of 0.9 or greater, showed a decrease in the silicon fraction of signal with decreasing incident electron energy, down to values of between 0.6 and 0.8 at 5 keV: this decrease was a function of particle size and composition. Simple models for silicon fraction of signal vs incident electron voltage suggest this behavour is due to a heterogeneous particle structure in which an aluminosilicate coating occludes the surface of a silica particle core. The coating survives incubation in a major component of pulmonary surfactant
65011‎$0‎MAPA20080585679‎$a‎Higiene industrial
65011‎$0‎MAPA20080605278‎$a‎Contaminantes químicos
65011‎$0‎MAPA20080573324‎$a‎Polvo de cuarzo
65011‎$0‎MAPA20080542900‎$a‎Arcilla
65011‎$0‎MAPA20080540760‎$a‎Cuarzo
65011‎$0‎MAPA20080545192‎$a‎Rayos X
65011‎$0‎MAPA20080553975‎$a‎Difracción
65011‎$0‎MAPA20080537005‎$a‎SEM
65011‎$0‎MAPA20080607609‎$a‎Partículas ambientales
65011‎$0‎MAPA20080591960‎$a‎Métodos de análisis
7001 ‎$0‎MAPA20080087289‎$a‎Wallace, W.E.
7404 ‎$a‎The Annals of occupational hygiene
7730 ‎$t‎The Annals of occupational hygiene‎$d‎Oxford [etc.]‎$g‎nº 2, April 1990 ; p. 195-204