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For example, a rock could be assayed to qualitatively detect the presence of gold and to quantitatively measure the amount of gold present. This process requires that the gold be dissociated from the rest of the rock's components using a number of different assays, such as the nickel sulphide fire assay coupled with flame atomic absorption …
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The main objective of this research was the determination of gold content in rock samples from Abu-Hamed geological Area, north Sudan, For the accurate determination of trace gold in rocks, solvent extraction method (diethyl ether and MIBK) was designed to pr interference and to effectively concentrate gold, atomic absorption spectroscopy …
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Determination of gold ions at trace level is an important issue for which some classical analytical techniques like atomic absorption/ emission spectroscopy (AAS/AES) with various atomizers [14 ...
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A method was designed for the determination of gold in geological samples such as rocks, ores, and soils buy flame atomic absorption spectrometry (FAAS) and graphite furnace atomic absorption ...
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The main objective of this research was the determination of gold content in rock samples from Abu-Hamed geological Area, north Sudan, For the accurate determination of trace gold in rocks, solvent extraction method (diethyl ether and MIBK) was designed to pr interference and to effectively concentrate gold, atomic absorption spectroscopy …
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mation of very low concentrations of gold in rocks, ores and other geological samples. 30 g sample was digested using aqua regia after roasting and gold content was extracted into DIBK phase consisting of AliquatTM 336 and estimated by flame atomic absorption spectrometer (F-AAS). Samples having gold concentration 0.1 lg/g were estimated using
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In chemical analysis it is m ore . ... There are 4 major techniques i.e. Atomic Absorption Spectroscopy (AAS), Instrumental Neutron Activation Analysis (INAA),Inductive Coupled Plasma-OES/MS and X ...
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A method is described for the analysis of gold ore in the ppm range using energy-dispersive XRF spectrometry. Ore is digested in aqua regia and gold is separated by coprecipitation with tellurium, followed by solvent extraction into isobutyl methyl ketone (IBMK). The recovery of gold is better than 98% and the detection limit is 0.1 μg of gold.
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Gold ions retained by the sorbent were eluted using 0.5 mol L − 1 thiourea in 0.1 mol L −1 HCl solution and determined by the flow injection flame atomic absorption spectrometry (FI-FAAS). The factors affecting the separation and preconcentration of gold were investigated and optimized.
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A simplified scheme, combining aspects of the classical fire-assay with an atomic-absorption finish, is presented for the determination of gold and silver in ores and concentrates. The lead assay button is scorified to approximately 2 g …
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Then, the gold concentration is measured on a 15 g portion by fire assay and gravimetric finishing for gold concentrations greater than 10 ppm, and by atomic absorption spectroscopy for gold concentrations less than or equal to 10 ppm.. 3. Results and discussion3.1. LIBS calibration
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Analytica Chimica Acta, 245 (1991) 7-11 7 Elsevier Science Publishers B.V., Amsterdam Determination of gold in ore by flame atomic absorption spectrometry with flow-injection on-line sorbent extraction preconcentration Shukun Xu, Lijing Sun and Zhaolun Fang * Flow Injection Analysis Research Centre, Institute of Applied Ecology, …
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Electrothermal atomic absorption spectrometry is one of the preferred methods for determination of micrograms of gold. The use of an appropriate chemical …
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weighing of metal or measured with instrumentation such as atomic absorption spectroscopy(8). The analysis of gold grades in this research using two samples are concentrates and cupel loss. The concentrate is the result of the concentrated of the ore containing high grade gold and silver, and determined using a gravimetric method. The …
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A method was designed for the determination of gold in geological samples such as rocks, ores, and soils buy flame atomic absorption spectrometry (FAAS) and …
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This paper describes fire assaying and 'high tech' alternatives for gold analysis, including the advantages and disadvantages of each method. These 'high tech' methods include instru neutron activation, aqua-regia digestion/atomic absorption, graphite furnace-atomic absorption or ICPMS and combinations of cyanidation with some of these methods.
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Gold in ores was determined by flame atomic absorption spectrometry following on-line preconcentration by sorbent extraction in a flow-injection system.
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4. Atomic absorption spectrometry. Electrothermal atomic absorption spectrometry is one of the preferred methods for determination of micrograms of gold. The use of an appropriate chemical modifier or separation of analyte could prevent the interference effects from the matrix.
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ZHUANG A C, XIAO H X. Determination of gold in gold-bearing industrial sludge by lead assay enrichment-fire atomic absorption spectrometry[J]. Gold, 2018, 39(6):75-77. Google Scholar. ZHUANG A C, XIAO H X. Determination of gold in gold-bearing industrial sludge by lead assay enrichment-fire atomic absorption …
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The methods range from those known since antiquity (e.g. fire assay, touchstones, specific gravity measurements) to modern spectroscopic (emission, absorption, induced coupled plasma etc.) and nondestructive fluorescence (X- and gamma-rays in the widest sense) and radioactive (neutron activation) techniques.
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activities, or supplying the quality control assay of the fi nal product from PM producers or recyclers. PMs are also produced as a by-product of copper or nickel processing. Today's analysts have access to a range of elemental analytical techniques including fl ame and graphite furnace atomic absorption spectroscopy (AA),
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Analytical methods and techniques for the determination of gold contents are employed in the exploration and evaluation of gold deposits, grade control in primary and secondary …
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Data on the precious metal contents obtained by using particular digestion methods as well as UV-VIS spectrophotometry, atomic absorption spectrometry, atomic emission spectrometry and inductively ...
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A solvent extraction method using diisobutyle ketone (DIBK) is designed for the accurate and precise estimation of very low concentrations of gold in rocks, ores and other geological samples. 30 g sample was digested using aqua regia after roasting and gold content was extracted into DIBK phase consisting of Aliquat™ 336 and estimated …
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A search of the literature shows Flame Atomic Absorption Spectrometry (FAAS) is often used for the determination of Au, Pd, and Pt in metal ores (1, 9, 10). FAAS offers acceptable sensitivity for the application. However, FAAS is typically a single element …
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Today's analysts have access to a range of elemental analytical techniques including fl ame and graphite furnace atomic absorption spectroscopy (AA), …
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Atomic Spectroscopy 165 Vol. 25(4), July/August 2004 The Determination of Gold in Ore Samples by Inductively Coupled Plasma Optical Emission Spectrometry(ICP-OES) ... Fire assay (1,2) has
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The gold content of the organic phase can be accurately determined by atomic absorption spectrometry. Table 4 represents gold data obtained on some international gold geochemical reference samples by MIBK extraction method in comparison with certified values. These results clearly indicate that the recovery of …
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Slurry sampling for the determination of silver and gold in soils and [59] B. Gong, Y. Liu, J. Li, Comparison of chemical modifiers used for the sediments using electrothermal atomic absorption spectrometry, determination of gold in ores by electrothermal atomic absorption Spectrochim. Acta, Part B: Atom.
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Mineralogists, studying gold ores resistant to direct cyanide attack, have reported that gold particles were sometimes coated with a layer consisting mainly of hydrated oxides of iron [28] . ... Tindall, F.M. (1965) Silver and Gold Assay by Atomic Absorption Spectrometry: Perkin-Elmer Atomic Absorption. Atomic Absorption Newsletters, 4, 339-340
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Atomic Absorption Spectrometry (AAS) revealed the gold content to be 31 gram per tonne in the sample. The cyanide bottle roll test determined the free gold assay of 16 gram per tonne.
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1.1 This test method covers the spectrographic analysis of ores, minerals, and rocks for silver, palladium, platinum, gold and rhodium. The concentrations of precious metals which can be determined in the material being analyzed depend on the amount of sample assayed (Note 1). Concentration ranges for the lead fire assay beads are as …
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Many techniques are avail-able for the determination of gold using either the classical methods, such as fire assay (FA) (4) and cyanidation (5,6), or the modern instrumental …
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DOI: 10.1016/0039-9140(74)80146-3 Corpus ID: 19932183; Determination of gold in copper-bearing sulphide ores and metallurgical flotation products by atomic-absorption spectrometry.
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Semantic Scholar extracted view of "Gold analysis; fire assaying and alternative methods" by E. Hoffman et al. ... The present work aims to compare the reading techniques of Flame Atomic Absorption and Microwave Plasma Atomic Emission Spectrometry. A total of 10 certified samples with the gold ... Recovery of gold from …
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The two methods presented for the determination of traces of gold in geologic materials are the cyanide atomic-absorption method and the fire-assay atomic-absorption method. In the cyanide method gold is leached with a sodium-cyanide solution. The monovalent gold is then oxidized to the trivalent state and concentrated by extracting into methyl isobutyl …
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