Centro de Documentacion de Fundación MAPFRE - Clay occlusion of respirable quartz particles detected by low voltage scanning electron microscopy, X-ray analisis

MAP20071017824

Clay occlusion of respirable quartz particles detected by low voltage scanning electron microscopy, X-ray analisis / W.E. Wallace... [et al.]

Sumario: Respirable-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

En: The Annals of occupational hygiene. - Oxford [etc.]. - nº 2, April 1990 ; p. 195-204

1. Higiene industrial . 2. Contaminantes químicos . 3. Polvo de cuarzo . 4. Arcilla . 5. Cuarzo . 6. Rayos X . 7. Difracción . 8. SEM . 9. Partículas ambientales . 10. Métodos de análisis . I. Wallace, W.E. . II. Título. III. Título: The Annals of occupational hygiene.