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

 
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<title>Clay occlusion of respirable quartz particles detected by low voltage scanning electron microscopy, X-ray analisis</title>
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<title>The Annals of occupational hygiene</title>
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<name type="personal" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="MAPA20080087289">
<namePart>Wallace, W.E.</namePart>
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<dateIssued encoding="marc">1990</dateIssued>
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<abstract displayLabel="Summary">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</abstract>
<note type="statement of responsibility">W.E. Wallace... [et al.]</note>
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<topic>Higiene industrial</topic>
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<topic>Contaminantes químicos</topic>
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<topic>Polvo de cuarzo</topic>
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<topic>Arcilla</topic>
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<topic>Rayos X</topic>
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<topic>Partículas ambientales</topic>
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<topic>Métodos de análisis</topic>
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<text>nº 2, April 1990 ; p. 195-204</text>
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