New PDF release: Analytical Chemistry in the Exploration, Mining and

By A. Strasheim

ISBN-10: 0080211992

ISBN-13: 9780080211992

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Read or Download Analytical Chemistry in the Exploration, Mining and Processing of Materials. Plenary Lectures Presented at the International Symposium on Analytical Chemistry in the Exploration, Mining and Processing of Materials, Johannesburg, RSA, 23–27 August 1976 PDF

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Additional info for Analytical Chemistry in the Exploration, Mining and Processing of Materials. Plenary Lectures Presented at the International Symposium on Analytical Chemistry in the Exploration, Mining and Processing of Materials, Johannesburg, RSA, 23–27 August 1976

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Ruthenium, Ir and Os collection is more seriously affected by flux composi­ tion and assay conditions. Ruthenium losses are not closely related to the degree of slag acidity. Collection of Os and Ru is favoured by high tempera­ ture. Appreciable losses of Os are experienced using basic fluxes and a minimum button size of 25g must be maintained. Basic or subsilicate slags cause severe Ir losses. A re-assay of slags is usually necessary for quan­ titative recovery of Ir due to its low affinity for lead.

Recently the revolution in electronics has led to a new generation of electrochemical equipment. As a result techniques such as differential pulse polarography and anodic stripping voltametry can be performed with relatively inexpensive equipment, compared to atomic absorption. This tech­ nique, together with twin cell and ac polarography are being investigated with renewed interest. However, it is the present author's opinion that despite certain advantages, such as greater sensitivity compared to atomic absorption, these techniques will make few inroads on the wide spread use of the former method for quantitative work.

Because atomic absorption is relatively inexpensive and relatively easy to operate it has come within the reach of most industries working with noble metals. Future directions for atomic absorption research Electrothermal atomizers have potential detection limit advantages over flame devices. However non-specific background interference problems, encountered in work with complex matrix samples, often negates this advan­ tage. Much research is necessary to evaluate this and other problems with electrothermal atomizers.

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Analytical Chemistry in the Exploration, Mining and Processing of Materials. Plenary Lectures Presented at the International Symposium on Analytical Chemistry in the Exploration, Mining and Processing of Materials, Johannesburg, RSA, 23–27 August 1976 by A. Strasheim


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