Download or read book The Separation and Determination of Noble Metals by Reversed phase extraction Chromatography Laboratory Method No 78 11 written by and published by . This book was released on 1971 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: By this laboratory method, the noble metals are separated from one another as the solution containing them passes through a glass column of Porasil C that has adsorbed tri-n-butyl phosphate, different mineral acids being used as eluents. Rhodium and platinum are determined photometrically with tin (II) chloride solutions, and palladium and iridium are determined colorimetrically - palladium with thioglycollic acid, and iridium with leuco-crystal violet. The gold is determined by atomic-absorption spectrophotometry. The method is applicable to the noble metals present in cupellations prills, in hydrochloric acid solutions obtained from the dissolution of tin and nickel sulphide buttons, and in acid extracts of ores and concentrates. Osmium and ruthenium, if present, are volatilized, in the presence of an oxidizing agent, during the dissolution step with aqua regia, and are not determined by this method.

Download or read book The Separation of Non volatile Noble Metals by Reversed phase Extraction Chromatography written by Christel Pohlandt and published by . This book was released on 1971 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Chromatographic Separation and Determination of Noble Metals in Matte leach Residues written by Christel Pohlandt and published by . This book was released on 1973 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Laboratory Method No 78 6 The Chromatographic Separation and Determination of Platinum Palladium Rhodium and Iridium written by and published by . This book was released on 1970 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Platinum, palladium, rhodium, and iridium are separated chromatographically and are then quantitatively determined by spectrophotometric methods. The method involves the spotting of a hydrochloric acid solution of the platinum-group metals onto a paper strip and the development of the chromatogram with a suitable solvent, the choice of solvent being determined by the elements for which an analysis is required. Separation of the platinum-group metals takes place by upward diffusion, and under suitable conditions each metal forms a well-defined band on the paper strip. These bands are identified under shortwave ultraviolet light and are then marked and cut out, and the individual platinum-group metals are determined colorimetrically. When only platinum and palladium are to be determined, the solvent is a mixture of pentanol, hexone, and hydrochloric acid. The sections containing platinum and palladium are cut out from the strip, and the metals are determined colorimetrically with tin (II) chloride and thioglycollic acid respectively. Because rhodium cannot be determined in the presence of iridium if these two elements are to be determined, n-butanol saturated with 3 N hydrochloric acid having a hydrogen peroxide content of 10 per cent must be used as the solvent. With this solvent, iridium moves up the paper and forms a visible band close to that of platinum, while rhodium remains near the spotting position. Rhodium is extracted from the paper and determined spectrophotometrically with stannous chloride. The amount of iridium present on a strip can be estimated by visual comparison with standards.

Download or read book The Analytical Chemistry of the Noble Metals written by F. E. Beamish and published by Elsevier. This book was released on 2013-10-22 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt: Analytical Chemistry, Volume 24: The Analytical Chemistry of the Noble Metals describes the procedures for the separation, extraction, and analysis of noble metals. This book is composed of seven chapters, and begins with a survey on the influence of metallurgical factors on the susceptibility of platinum and gold metals to various corrosive agents. The succeeding chapter provides the methods of isolation of osmium and ruthenium from associated platinum metals and from base metals. A chapter examines the application of gravimetric methods for the separation of seven noble metals, including ruthenium, osmium, rhodium, iridium, palladium, platinum, and gold. Other chapters consider the procedures for volumetric, spectrophotometric, and spectrochemical analysis of noble metals. The concluding chapter describes the features and attributes of the equipment for noble metal analysis. This book is of value to analytical chemists and workers and researchers in metallurgy.

Download or read book Analysis of Noble Metals written by F.E. Beamish and published by Elsevier. This book was released on 2012-12-02 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Laboratory Method No 78 8 The Determination by Atomic absorption Spectroscopy of Platinum Palladium Rhodium Ruthenium and Gold in the Presence of Base Metals written by and published by . This book was released on 1970 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: A method for the determination, by atomic-absorption spectrophotometry, of platinum, palladium, rhodium, ruthenium, and gold is described. Vanadium in a perchloric acid medium is used as a releasing agent for the removal of interferences. Tin, magnesium, chromium, cobalt, nickel, aluminium, selenium, tellurium, calcium, copper, or sodium, in amounts below 5 g/l, and gold in an amount below 1 g/l, do not interfere. Silver and lead in amounts above 0.02 g/l may cause some loss of noble metals because of occlusion in the chloride precipitate formed. SO4(2-) above 1.5 g/l may cause an interference, and iron may cause a loss of gold owing to the reduction of this noble metal. The method is rapid, since all the noble metals can be measured in one solution, and is suitable for the analysis of solutions resulting from the nickel sulphide or tin collection procedures. Coefficients of variation for all the noble meals are less than 1 1/2 per cent.

Download or read book Separation and Determination of Complexes of Noble Metals by High Performance Liquid Chromatography written by R. Chen and published by . This book was released on 1988 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Collection and Rapid Determination of Noble Metals in Ores and Concentrates by the Fusion Technique Using Lead as a Collector Laboratory Method No 78 5 written by and published by . This book was released on 1970 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The sample is mixed with a flux consisting of borax, sodium carbonate, silica, lead oxide, and maize meal. During the fusion procedure, the maize meal reduces the lead oxide to metallic lead, which falls to the bottom of the crucible, carrying the noble metals with it. The molten lead and slag are transferred to an iron mould and allowed to solidify. The lead is separated from the slag and cupelled at 960 degrees C. During this procedure, the lead is absorbed by the material of the cupel, and a prill containing the noble metals is left on the surface of the cupel. After this first cupellation, the prill either is cleaned, weighed, and analysed for the individual platinum-group metals and for gold, or is subjected to a high temperature cupellation (1300 degrees C) for the removal of silver and residual lead. This prill, containing only the platinum group metals and gold, is cleaned and weighed, to give a close assessment of the total content of the platinum-group metals and gold.

Download or read book The Chromatographic Separation and Gravimetric Determination of Noble Metals in Matte leach Residues written by C. Pohlandt and published by . This book was released on 1973 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Laboratory Method No 78 4 The Determination by Atomic absorption Spectrophotometry of Platinum Palladium Rhodium Ruthenium Gold Silver and Lead in Prills written by and published by . This book was released on 1970 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The prill is dissolved in aqua regia, and uranium is added to serve as a releasing agent and to remove mutual-interference effects. The solution is diluted to a definite volume, and the absorbance of the noble metals, silver, and lead, is measured and compared with that of calibration standards. If silver is present in high concentrations, strong hydrochloric acid is used for the dilution.

Download or read book Laboratory Method No PT 78 3 The Determination of Gold by Atomic Absorption and of Platinum Palladium Rhodium and Iridium by Spectrophotometry in Solutions written by and published by . This book was released on 1970 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gold is extracted with dibutyl 'Carbitol' and determined by an atomic-absorption method. The platinum-group metals in the aqueous phase are freed from traces of organic reagent by oxidation with perchloric acid, then converted to the chlorocomplexes and taken into solution with hydrochloric acid. Platinum and palladium are separated from rhodium and iridium by their conversion to the iodide complexes and subsequent extraction with 15 per cent tri-n-butyl ortho-phosphate in hexane, rhodium and iridium being left in the aqueous phase (a). Platinum and palladium are recovered by back-extraction with concentrated nitric acid after which the palladium is complexed with p-nitrosodimethylaniline and the absorption measured. The complex is then extracted with chloroform, leaving the platinum in the aqueous phase (b), in which it is determined. Rhodium and iridium left in aqueous phase (a) are converted to the chlorocomplexes after any iodides have been removed. Iridium is extracted with 1:1 tri-n-butyl ortho-phosphate in hexane in the presence of hydrogen peroxide. Rhodium is determined in the aqueous phase, and iridium is recovered from the organic phase by back-extraction with 1:9 hydrobromic acid. When the four platinum-group metals have been separated, they are determined spectrophotometrically.

Download or read book The Detection of Noble metal Impurities in Refined Noble metal Solutions by Thin layer Chromatography written by Magdalena M. Krüger and published by . This book was released on 1974 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Chromatographic Methods in Inorganic Analysis written by Georg Schwedt and published by . This book was released on 1981 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Detection and Separation of Metals Using Reversed phase High Performance Liquid Chromatography written by Pauzi b Sulaiman and published by . This book was released on 1990 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Recent Advances in the Analytical Chemistry of the Noble Metals written by Fred Earl Beamish and published by Pergamon. This book was released on 1972 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Separation of the Noble Metals and the Determination of These Metals by Atomic Absorption Spectrophotometry written by Helen (Stalcup) Copeland and published by . This book was released on 1972 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: