determination of gold by substoichiometric extraction

Determination of gold by substoichiometric extraction with ...

Jun 05, 2011 · 高达10%返现 · Estimation of gold has been successfully carried out by substoichiometric radiochemical solvent extraction method using a newly designed organic moiety, N-thioacetyl benzamide as extractant and chloroform as solvent at aqueous pH 4.The interference effects of different closely related diverse ions like Fe(III), Cu(II), Co(II), Zn(II), Ni(II) etc. were also critically studied.

Substoichiometric extraction of gold(III). Determination ...

Dec 01, 1975 · The extraction constant of gold dichloride diethyldithiocarbamate has been determined (log K = 68.2 ± 0.2) by studying the competition from palladium in the substoichiometric extraction of gold with copper diethyldithiocarbamate in chloroform. Experimental conditions that allowed the equilibrium to be reached for any palladium concentration were chosen so that the influence of the

Determination of gold by substoichiometric extraction with ...

The extraction constant of gold dichloride diethyldithiocarbamate has been determined (log K = 68.2 ± 0.2) by studying the competition from palladium in the substoichiometric extraction of gold ...

Substoichiometric determination of traces of gold by ...

A radioactive isotope-dilution method for the determination of traces of gold has been developed. It is based on the solvent extraction of gold diethy

Substoichiometric neutron activation determination of gold ...

高达10%返现 · A highly precise and selective method is described for the determination of traces of gold by substoichiometric extraction from hydrochloric acid with tri-n-octylphosphine sulfide in cyclohexane following thermal neutron activation. Fundamental aspects of the extraction system are discussed and results are reported for the determination of gold in an effluent from a recovery process.

Determination of the extraction constant of gold ...

May 01, 1981 · The absolute values of the extraction constants of these chelates are very high, and their determination is difficult and complicated [6 8]. The present study is a new approach in the determination of the extraction constants of gold diethyldithiocarbamates using a fairly simple and reliable experimental technique.

The Substoichiometric Determination of Gold in Iron by ...

The Substoichiometric Determination of Gold in Iron by Activation Analysis F. KUKULA Institute of Nuclear Research, Czechoslovak Academy of Sciences, Prague- Řež Received February 5, 1969 Either copper(II) diethyl dithiocarbamate or zinc diethyl dithiocarbamate was applied as a reagent for the substoichiometric extraction of gold to its

Substoichiometric separation in activation analysis ...

Substoichiometric extraction can be combined with neutron-activation analysis for the determination of traces of iodine, caesium, rubidium, manganese, rhenium, chromium, thallium, gold,

Extraction and Spectrophotometric Determination of Gold ...

Anal. Chem. All Publications/Website. OR SEARCH CITATIONS

(PDF) Extraction of gold(III) with copper ...

The extraction constant of gold dichloride diethyldithiocarbamate has been determined (log K = 68.2 ± 0.2) by studying the competition from palladium in the substoichiometric extraction of gold ...

Determination of gallium by displacement substoichiometric ...

Determination of gallium by displacement substoichiometric extraction with labeled indium-oxinate in chloroform. Mandal M(1), Banerjee S, Basu S. Author information: (1)Department of Chemistry, Tamralipta Mahavidyalaya, Tamluk, Purbamedinipur 721636, West Bengal, India.

Extraction of reduced molybdosilicic acid and its ...

Substoichiometric determination of traces of gold by radioactive isotope-dilution analysis. Beardsley DA, Briscoe GB, Růzicka J, Williams M. Talanta, 14(8):879-886, 01 Aug 1967 Cited by: 1 article |

Substoichiometry in Radiochemical Analysis - 1st Edition

Specifically, this book provides the methods for the substoichiometric determination of traces of various elements by the neutron-activation and isotope-dilution analyses. Copper, mercury, gallium, gold, and zinc are some of the elements featured in this particular topic. This topic is followed by the discussion on the analysis of radioactive ...

Extraction Equilibrium and Simple Extractive ...

2.3 Recommended extraction procedures 2.3.1 Determination of the extraction equilibrium constants (KD, ß, Kex) Aliquot aqueous solutions of gold (III) ions (10 mL, 1-10µg mL-1) at pH 5-6 were transferred to separating funnels (50.0 mL). A 2 mL of the reagent DPG+ Cl-solution (8.0 × 10-5 mol L-1) was added to each gold solution.

Selective determination of ultra trace amounts of gold by ...

Determination of ultra traces of lead in water samples after combined solid-phase extraction–dispersive liquid–liquid microextraction by graphite furnace atomic absorption spectrometry.pdf By marzieh sadeghi

Determination of Impurities in Silicon by Neutron ...

Determination of Silver, Cadmium, Indium, Tantalum, Rhenium, Gold, and Rare Earths at Low Concentration by Neutron Activation and Radiochemical Analysis.. ... Using NAA to the Determination of Antimony in Trichlorosilane with Substoichiometric Extraction. Journal of the Chinese Chemical ... Determination of phosphorus in semiconductor grade ...

`BUNSEKI KAGAKU' Abstracts Vol. 4 8 No. 9 (Sep., 1999)

Fractional determination of gold in geological reference samples by sequential extraction/graphite furnace AAS. Shigeru Terashima and Masahiro Taniguchi. Geological Survey of Japan, 1-1-3, Higashi, Tsukuba-shi, Ibaraki 305-8567 (Received 7 April 1999, Accepted 28 May 1999)

Recovery of Waste Back Board and Gold from the Process of ...

Feb 26, 2010 · Especially, the printed circuit board that has been used for important mobile electronic pans are plated with min.0.03 ${\mu}m$ to max.50 ${\mu}m$. As increasing the cost of gold, raw material, chemicals, payments and waste material, it has been accelerated the competition for reuse and recovery.

Spectrophotometric Determination of Ammonia as Indophenol ...

Substoichiometric extraction of 14 metals from sulfuric, hydrochloric, and perchloric acids with zinc diethyldithiocarbamate by radiometric extractive titration Wyttenbach, Armin. / Bajo, Sixto. | 1975

Determination of silver in rocks by neutron activation ...

A rapid method for determination of silver in rocks and minerals by neutron activation was developed. The method is based on the quantitative and selective separation of silver by organic sulfide extraction. (auth) 75OO A method has been developed for the substoichiometric extraction of copper with a solution of alpha -benzoinoxime in chloroform.

Determination of Gold in Geologic Materials by Solvent ...

Determination of Gold in Geologic Materials by. Solvent Extraction and Atomic-Absorption Spectrometry By Claude Huffman, Jr., J. D. Mensik, and L. B. Riley GEOLOGICAL SURVEY CIRCULAR 544 Washington 1967

Determination of Extraction Constants of Gold ...

Determination of Extraction Constants of Gold Diethyldithiocarbamate Dichloride by Substoichiometric Extraction . By J. M. Lo. Abstract [[department]]生醫工程與環境科學

An Atomic-Absorption Method for the Determination of

A laboratory method for the determination of gold in large ( 100-gram) samples has been developed for use in the study of the gold content of placer deposits and of trace amounts of gold in other geologic materials. In this method the sample is digested with bromine and ethyl ether, the gold

Gold Extraction & Recovery Processes

Feb 29, 2016 · If the solution is rich enough can be treated by zinc powder and the precipitated obtained (cement) obtained will be sent to retorting and smelting. For gold extraction the strength of cyanide solution ranges from 0.01 to 0.05%. Lime is added to the process in order to have a pH near to 10-11.

(PDF) Gold Extraction and Recovery Processes For Internal ...

Extraction of gold from arsenic gold ore concentrate Increase temperature of smelting chamber to 100- 7,498,006 Process for extracting gold in arsenic- 3/3/09 containing concentrate of gold 300°C, hold temperature to remove vapor and small Under residual pressure 50MPa, increase quantity of dust temperature to 300-500°C to remove volatile ...

Solid phase extraction and a spectrophotometric method for ...

DETERMINATION OF GOLD BY SOLID PHASE EXTRACTION 1135 dissolving 4-BARA in 95 % ethanol. A stock standard solution of gold (1000 μg/mL) was obtained from the Chinese Standard Material Center, and a working solution of 0.20 µg/mL was prepared by diluting the stock standard solution. A 1.0 mol/L phosphoric acid was used.

Application of l-(3,4-dimethylphenyl)-dodecanedione-l,2 ...

extraction of trace amounts of nickel(H) from an aqueous phase for subsequent determination of this metal by electrothermal atomic absorption (4). The results encouraged us to extend the investigations to extraction conditions hi which not the extractant, but the metal in question remained hi a stoichiometric excess. Such a substoichiometric ...

RESEARCH ESTABLISHMENT LUCAS HEIGHTS

Neutron activation determination of gold in rocks using Dibutyl Sulfide extraction for gold separation J. Radioanal. Chem.; 8: no. 1 39-43 (June 1971) NSA 26: 6507 1972 GILLUM, David Eugene Group separation techniques for the determination of noble metals in meteorites by activation analysis. Lexington, University of Kentucky, 1971 Ph.D. thesis

The Application of Flame Atomic Absorption Spectrometry ...

One of the known procedures for gold determination was its extraction with methyl isobutyl ketone (MIBK) [14]-[16]. A prerequisite for analysis of gold with MIBK [17]and its determination in graphite furnace was the previous precipitation of iron with ammonium hydroxide in order to eliminate interference effect on gold.

Determination of copper(II) by displacement ...

Apr 17, 2013 · Determination of Copper(II) by Displacement Substoichiometric Extraction with Radiolabeled Cobalt(II) M. Bag*, P. Chattopadhyay, and S. Basu** Department of Chemistry, University of Burdwan, Burdwan, 713104 India; e-mail: * [email protected], ** [email protected] yahoo.co Received June 18, 2012 Abstract—A substoichiometric ...

Replica Extraction Method on Nanostructured Gold Coatings ...

Introduction. The replica technique is an indirect method to survey surface topography (Glauert, Reference Glauert 1972).In glass science, the first investigation of liquid/liquid phase separation is coupled with study of replicas in the electron microscope (Vogel, Reference Vogel 1994).A common route for replica preparation starts with a fractured or polished glass surface, which is etched.

[PDF] Substoichiometry In Isotope Dilution Analysis ...

466 , 1969 385 70 004 COOKSEY BG SUBSTOICHIOMETRY IN ISOTOPE DILUTION ANALYSIS.AUTOMATION OF THE PROCESS WITH REFERENCE TO MERCURY THESIS , UNIV .. Author: . Publisher: ISBN: UOM:39015095221944 Category: Mass spectrometry Page: 880 View: 376 DOWNLOAD & READ

Determination of lead in rocks by radiometric isotope ...

A rapid procedure is described for the determination of lead in rocks by an isotope-dilution substoichiometric method. After the sample has been digested with acid in the presence of 210Pb tracer, the lead is separated by dithizone extractions. After the lead has been back-extracted into aqueous solution, it is reacted with a substoichiometric amount of EDTA.

Determination of trace gold in rock samples by a ...

For the accurate determination of trace gold in rocks and iron minerals by graphite furnace atomic absorption spectrometry, a two-stage solvent extraction method (diethyl ether and MIBK) was designed to prevent strong interference from iron and to effectively concentrate gold.

Copyright © 2020.Company name All rights reserved.SiteMap