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By A. Strasheim

ISBN-10: 0080211992

ISBN-13: 9780080211992

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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

Sample text

The present writer sees a great potential for the application of cathodic sputtering to the high precision analysis of noble metals in alloys. In 1975, at the 5th International Conference on Atomic Spectroscopy in Melbourne, Walsh announced the development of a flame resonance spectro­ meter. This flame, to be described elsewhere in this program, can be used to isolate the resonance lines of the element of interest, thus replacing the monochromator in a conventional instrument. The flame resonance spec­ trometer introduces the possibility of practical multi-element analysis by atomic absorption spectroscopy analysis in the future.

Results are reported as "mass/surface area" (jig/cm ). In the Hoesch laboratory a very simple and sensitive method for the determination of substances cm surfaces of steel sheets was elaborated with the XRF technique. The most important calibration is done with salt or acid solutions on the same area of clean steel plates. The direct measurement of substances on surfaces of thin sheets from production has to be followed by a background-correction (measurement after grinding). Many elements such as S, P, Cl, Si, Mn, Cu, Cr, Ni, Sn, Pb, etc.

This is particularly valuable in the case of Os which can be lost during an air roast. In general the niter assay is applicable to all the noble metals. Again the experience of the assayer is of crucial importance to the success of this approach. The Fe nail assay is applicable to Au determinations but should not be used for the other noble metals. Analytical chemistry of the noble metals 1497 Other assay procedures Alternative assay procedures have been developed. These include collection by Fe, Cu, Ni or Sn or nickel sulfide.

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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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