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Author: Basil Trewinnard Eddy
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Basil Trewinnard Eddy
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Basil Trewinnard Eddy
Publisher:
ISBN:
Category :
Languages : en
Pages : 232
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Author: Basil Trewinnard Eddy
Publisher:
ISBN: 9780869997611
Category : Chromium
Languages : en
Pages : 23
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
During the upgrading of platinum ores and the refining of concentrates, analytical information is required on ores, ore concentrates, mattes, matte-leach residues, solutions resulting from the leaching process, and the refined metals. In this field the National Institute for Metallurgy has played a prominent role and has evolved accurate procedures using gravimetric, spectrophotometric, and atomic-absorption methods for the measurement of the noble metals after they have been separated by fire-assay or wet-chemical techniques or both. However, these methods are either lengthy or do not always give adequate precision for the higher concentrations. The X-ray-fluorescence method has potential for speeding up the analysis of some of these materials and for providing greater precision, particularly in the higher-concentration ranges. For matte-leach residues accurate, rapid results are required and it is in this field that the X-ray fluorescence method is shown to be of particular value. A further field in which X-ray fluorescence could be valuable is in the analysis of matte-leach solutions which contain very small amounts of noble metals and high concentrations of base metals. No technique appears to be of direct application to these materials, but the noble metals can be adsorbed on ion-exchange resin and then rapidly determined by X-ray fluorescence techniques. Molybdenum was investigated as an internal standard for palladium, rhodium and ruthenium but was found to be unsatisfactory for the former two elements because the molybdenum Ka absorption edge at 0,620 A lies between the molybdenum Ka1 line at 0,711 A and the palladium and rhodium Ka1 lines at 0,614 and 0,587 A respectively. The background intensity measurement was, however, successfully used for matrix corrections. It was felt that the most satisfactory matrix corrections would be obtained by the use of suitable internal standards and the technique described here used cadmium and mercury. The collection of the noble metals in nickel sulphide by the fire-assay procedure and the analysis of the pressed powder permit the determination by X-ray fluorescence of most of the noble metals in flotation concentrates and nickel sulphide mattes. However, for ores, the noble-metal content is too low for this method to be successful. Although ion-exchange resins can be used to adsorb the noble metals from solutions and can then by analysed by X-ray fluorescence, the lower limit of detection for platinum and palladium adsorbed onto 1g of resin is 53 and 15 ppm respectively. X-ray fluorescence provides an accurate and precise method for the determination of the noble metals in matte-leach residues, provided the composition of the samples does not vary widely and that standards similar in composition to the samples can be prepared.
Author: British Standards Institute Staff
Publisher:
ISBN: 9780580688416
Category :
Languages : en
Pages : 32
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Book Description
High-alloy steels, Alloy steels, Steels, X-ray fluorescence spectrometry, Instrumental methods of analysis, Chemical analysis and testing, Determination of content, Metals, Non-metals, Test equipment, Test specimens, Specimen preparation, Calibration, Control samples, Precision
Author: William Johnson
Publisher:
ISBN:
Category : Steel alloys
Languages : en
Pages : 82
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Book Description
Author: F. T. Wybenga
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author:
Publisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 744
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Book Description
Author: Charles Morris Johnson
Publisher:
ISBN:
Category : Alloys
Languages : en
Pages : 578
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Book Description
Author: F.E. Beamish
Publisher: Elsevier
ISBN: 0323155022
Category : Science
Languages : en
Pages : 344
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Book Description
Analysis of Noble Metals: Overview and Selected Methods describes simple techniques with useful sensitivity, accuracy, and precision for noble metal analysis. This book is composed of seven chapters that include the methods of atomic absorption, spectrochemical, spectrophotometric, gravimetric, volumetric, and potentiometric determinations of noble metals. Each chapter discusses the concept, principles, practice, and application of the specific analytical technique. A chapter examines several separation methods for noble metals, including cation exchange, mercury amalgam, reduction, silver assay beads, solvent extraction, and dissolution. This book will be of great value to analytical chemists, instrumental engineers, and researchers.
