F.E. Beamish

A critical review of methods of isolating and separating the noble metals—II: Ion-exchange and solvent extraction

This review deals with ion-exchange and solvent extraction methods of separating the seven noble metals, published subsequent to the previous reviews and prior to January 1966. The noble metal species present in solution are discussed in so far as they relate to separation and determination.

a critical evaluation of colorimetric methods for determination of the noble metals—III: Palladium and platinum

Abstract Spectrophotometric methods for palladium and platinum recorded subsequent to 1958 are critically reviewed. Associated with the descriptions of each metal there is included a table which identifies reagents recorded before 1958 together with pertinent references.

A critical review of methods of isolating and separating the six platinum metals

Abstract This review covers pertinent publications up to January 1960. While relatively little of the early literature is discussed, certain procedures which remain potentially useful have been included. All published information related to the efficiency of fire-assay recovery is discussed from the point of view of flux composition, button and bead collections, and methods of parting the latter. The character and usefulness of a wet selective extraction before fire-assay fusion are critically examined. The wet methods of separating the six platinum metals are reviewed, and the application of exchange resins and chromatographic separations are discussed.

An experimental evaluation of neutron activation, wet assay and fire assay methods of determining gold in ores

The errors associated with fire assay, wet extraction and neutron activation methods are evaluated, the accuracy and precision of these methods are compared, and a method of determining chemical recovery in the activation determination of gold in ores and concentrates is presented.

A critical evaluation of colorimetric methods for determination of the noble metals-III: Rhodium, Iridium, Ruthenium, Osmium And Gold

Abstract Spectrophotometric methods for rhodium, indium, ruthenium, osmium and gold recorded subsequent to 1958 are critically reviewed. Associated with the descriptions of each metal is included a table which identifies reagents recorded before 1958 together with pertinent references.

Studies of titrimetric and spectrophotometric methods for the determination of gold

Abstract The titrimetric determination of gold by the iodometric technique is examined under various conditions. Irrespective of these conditions the stoichiometry of the reaction is found to be 1 atomic weight of gold to 2 formula weights of sodium thiosulphate. A modified bromoaurate spectrophotometric method is described, and the procedure is recommended for the determination of gold in amounts of 15 μg or more. The spectrophotometric determination of gold with methyl violet and trichloroethylene is examined critically. The method is recommended for concentrations of gold over the range 0.5–2.0 ppm. The stability of dilute gold solutions in acid media is also discussed.

A critical review of titrimetric methods for determination of the noble metals—II

Titrimetric methods for palladium, platinum, rhodium, iridium, ruthenium and gold are critically reviewed to the end of 1964. Previous reviews covered the literature to the end of 1957 for the five platinum metals and to mid-1960 for gold.

A critical evaluation of the gravimetric methods for the determination of the platinum metals

Abstract This paper is a review of quantitative gravimetric methods of analysis for the six platinum metals and covers the literature up to June, 1957. An attempt has been made to evaluate critically and relatively all of the acceptable methods. Although the complicated problems of en masse isolation from native sources are not considered, some attention is given to interferences arising from limited separations.

A critical review of neutron activation and tracer methods for the determination of the noble metals.

Neutron activation methods for the seven noble metals are critically reviewed up to December, 1965. The methods deal with the determination of trace impurities in each noble metal as well as traces of noble metals in media such as organic material, fission product and other solutions, ores, alloys, minerals, silica and base metals. The need for confirmatory evidence in the case of such complex materials as ores is emphasized.

Isolation of osmium and ruthenium by ionexchange paper and subsequent determination by X-ray fluorescence.

Quantitative separations of microgram quantities of osmium and ruthenium from large proportions of copper, iron and nickel were accomplished by the use of anion-exchange paper. Accurate determinations of osmium and ruthenium were made by adaptation of X-ray fluorescence. Wet methods for the dissolution of the paper and exchanger and subsequent wet determinations of osmium and ruthenium are discussed.