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,...., .. .... results have recentl~been reviewed (6): (1) Sulphur reacts with many impurities.and slowly changes its physical and chemical properties (2) Sulphur is photosensitive (3) The sulphur-sulphur bond character, distance and bond angle make possible the formation of many different rings and thousands of chain molecules, of which a large number have similar stability. (4) The intermolecular interaction of sulphur molecules can, for each of the many allotropes, lead to a variety of similarly stable poly- morphs. Most systems studied before 1950 consisted of mixtures of different polymorphs, often different molecular species. Some properties of special systems have since been studied, and are reviewed in a recent survey:(9). ·B. Impurities: Most Frasch and recovered Claus sulphurs are 99.99% pure or often better. During storage and shipping, however, many impurities are added. S9me standard contamination in industrial sulphurs are listed in Table I. The sulphur used in research work has in the past, unfortunately, been of very poor quality. Precipitated and sublimed sulphur, pharma- ceutical grades., with chalk and other additives have been connnonly used. · Five to ten percent ~dditives or contaminations are quite connnon in such grades. The first basic breakthrough in. the work on sulphur was based on a purification method developed by Bacon and Fanelli (10), who boiled sulphur with magnesium oxide and obt.ained samples which gave reproducible viscosities in the liquid phase. Since then many methods have been developed. They all produce high purity samples, but it is still essential that researchers know the origin and treatment of their material. Murphy,, .e .'·· -3- ...., ..PDF Image | ELEMENTAL SULPHUR
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