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By A. Strasheim

ISBN-10: 0080211992

ISBN-13: 9780080211992

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Additional resources 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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This source has been used with conventional prism and grating monochromators and with resonance spectrometers. In the case of the latter, the flame resonance spectrometer, is particularly attractive because of the ease with which a multielement capability may be achieved. Glow discharge emission techniques, like cathodic sputtering absorption cells, should find useful application in the analysis of noble metals in alloys in the near future. NEUTRON ACTIVATION SPECTROSCOPY AND OTHER NUCLEAR TECHNIQUES Neutron activation spectrosocpy occupies a unique position chemistry of the noble metals.

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. Using cupellation involving an Ag bead, losses to the cupel may be high for Ir and Ru. Gold beads are often employed for Ir collection. No cupellation is possible when Os is to be analysed due to its extreme volatility as the tetroxide. For both Os and Ru the cupellation step is invalidated. However, well pro­ ven procedures exist for the separation and recovery of these elements by perchloric acid decomposition of the lead button, directly, followed by distillation of the volatile tetroxides.

Future research is required to outline reagents which will give direct weighing forms for all the noble metals. These reagents should be selective and be applicable at a moderately acid pH. Selective reagents for large amounts of the noble metals could also find use in refining and manufac­ turing processes. Titrimetric methods are little used. They have found limited application as rapid pass-fail tests for noble metal products of interest to jewellers and other manufacturers. MOLECULAR ABSORPTION SPECTROPHOTOMETRY Historically these methods, to be designated spectrophotometrie methods in this paper, have been of great importance.

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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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