A Critical Examination of Quartz, Tridymite and Cristobalite: The Estimation of Free Silica

Dempster, P. B (1952) A Critical Examination of Quartz, Tridymite and Cristobalite: The Estimation of Free Silica. PhD thesis, University of Glasgow.

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1. The introduction records the various theories on the aetiology of silicosis and pneumokoniosis with reference to the pathological and chemical aspects of the changes brought about in the lungs by small silica particles. A survey is also given of physical and chemical analytical techniques for the estimation of the free silica content of rocks and dusts. 2. Detailed investigation of one chemical method, that of Trostel and Wynne, has shown it to be suitable, after modification, for the analysis of Stirlingshire coal-measure rocks. However, the high experimental losses occurring during the analysis of small particles preclude its use for the determination of the quartz content of airborne dusts. 3. The examination of the physical method of Differential Thermal Analysis has shown it to be influenced by the presence of a layer of non-quartz silica,which is not estimated,on ground quartz particles. The properties of this layer have been investigated and it has been concluded that it is of relatively constant thickness and density independent of the particle size of the quartz. The proportion of layer to quartz in airborne dusts is considerable and prevents the use of this method, as it stands, for their analysis. During rock analysis this method suffers some loss in accuracy due to the presence of the non-quartz layer hut suggestions are made to produce at least a partial recovery of the loss and also to make the method practicable for dust analysis. 4. The presence of this non-quartz layer has been shown to interfere with the X-ray analysis for quartz in dusts.

Item Type: Thesis (PhD)
Qualification Level: Doctoral
Keywords: Inorganic chemistry, Occupational safety
Date of Award: 1952
Depositing User: Enlighten Team
Unique ID: glathesis:1952-78872
Copyright: Copyright of this thesis is held by the author.
Date Deposited: 30 Jan 2020 14:44
Last Modified: 30 Jan 2020 14:44
URI: https://theses.gla.ac.uk/id/eprint/78872

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