Physicochemical Studies on Dusts. A: Analysis of Silicious Dusts. B: Some Sorption Properties of Silicious Dusts

Prentice, Andrew (1956) Physicochemical Studies on Dusts. A: Analysis of Silicious Dusts. B: Some Sorption Properties of Silicious Dusts. PhD thesis, University of Glasgow.

Abstract

Various important theories on the mechanism of the pathogenic reaction involved in the production of silicosis are critically surveyed. The favoured "solubility theory" suggested three topics for further physicochemical investigation. (1) (a) The effect of various inorganic anions and cations on the determination of dissolved silica by the Molybdenum Blue method is studied. The following ions do not interfere Anions : Carbonate, chloride, nitrate, sulphate. Cations: Aluminium, calcium, magnesium, manganese. The extent and nature of the interference caused by the following ions is discussed: Anions : Dichromate, phosphate. Cations: Copper, ferrous iron, ferric iron. The effect of copper is noteworthy, in that compound formation is indicated, the apparent ratio of copper to silica in the complex being 12 : 1, (b) Methods for the removal of copper and iron interference and for the determination of dissolved silica in the presence of dichromate ion are described. Various methods for the removal of phosphate interference have been investigated but they have been found to be unsuccessful. (2) The use of infra-red spectroscopy for the determination of the free silica content of mineral dusts has been investigated. It is concluded that it is possible to determine the free silica content of a dust by this method. A comparison of this method with two established methods has been carried out. (3) (a.) Adsorption isotherms for a number of amino-acids and dipeptides on a finely divided silica powder have been obtained. All the substances examined, with the exception of dl-leucylglycine, exhibit normal adsorption characteristics, the extent of adsorption decreasing with increasing temperature. The extent of adsorption of dl-leucylglycine on finely divided silica increases with increasing temperature between 25

• Item Type: Thesis (PhD)
• Qualification Level: Doctoral
• Keywords: Inorganic chemistry
• Date of Award: 1956
• Depositing User: Enlighten Team
• Unique ID: glathesis:1956-79158
• Copyright: Copyright of this thesis is held by the author.
• Date Deposited: 31 Mar 2020 09:09
• Last Modified: 31 Mar 2020 09:09
• URI: https://theses.gla.ac.uk/id/eprint/79158