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Neutron Activation Determination Of Gold In Rocks Ores
These methods are as follows a neutron-activation method of the gold determination by its quantitative extraction from the irradiated sample weighing 100-300 mg a neutron-activation method of the gold determination with the use of substoichiometric extraction (a weighted amount of 100-300 mg) a neutron- activation method of a preliminary ...
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Substoichiometric Exchange Extraction Of Tantalum And Gold
The conditions for substoichiometric exchange extraction in the system $$(C_6 H_5 )_4 AsTaF_6 _CHCl_3 - (AuCl_4 - )_w $$ have been investigated in order to establish the feasibility of substoichiometric separation of tantalum and its determination by activation.
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Determination Of Extraction Constants For Metal
May 01, 2002 Determination of extraction constant for polonium diethyldithiocarbamate by substoichiometric extraction. Analytica Chimica Acta 1983, 148, 327-330. DOI 10.1016/S0003-2670(00)85181-8. J.M. Lo, C.L. Tseng, S.J. Yeh. Determination of the extraction constant of gold diethyldithiocarbamate dichloride by substoichiometric extraction.
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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,
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Determination Of Cobalt By Substoichiometric Extraction
A substoichiometric radiochemical solventextraction method is described for the determination of cobalt, employing -hydroxy-naphthaldoxime and chloroform as reagent and extractant, respectively. The extraction behaviour of the complex of cobalt with the reagent in the pH-range 89.5 and the effects of various metal ions on the extraction are critically studied. The method is used to ...
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A New Principle Of Activationanalysis Separationsix
A simple radiochemical separation of bismuth has been developed, based on two dithizone extraction steps, the second of which is a substoichiometric e
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Substoichiometric Determination Of Heavy Rare Earths By
A substoichiometric method for the determination of heavy rare earths (holmium, thulium) has been developed. After the addition of a substoichiometric amount of EDTA to the test sample of rare earth labelled with its radioactive isotopes, the negatively charged complex formed was separated by passage through a column of Dowex 50 x 8.
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Substoichiometric Determination Of Traces Of Palladium By
It is based on the solvent extraction of palladium dithizonate from acid solution by means of a substoichiometric amount of dithizone in carbon tetrachloride. The separation has been applied to the determination of traces of palladium in platinum, the rocks W-1
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Substoichiometric Extraction Of Mercury By
The substoichiometric extraction of Hg2 using diethyldithiocarbamic acid and 203Hg tracer was studied. Chloroform was employed to remove the complexes from the aqueous media which were 0.5M H2SO4 or 1 M HClO4 and 0 to 5 M NaCL. - Systems containing Cl allowed extraction of Hg2 for all DDC/Hg molar ratios, the extracted complexes being HgCl(DDC) and Hg(DDC)2.
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Substoichiometric Extraction Of Silveri By Sbenzyl
A rapid and selective method has been developed for the determination of Ag in biological samples and mineral ores by thermal neutron activation analysis employing substoichiometric extraction ...
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Solvent Extraction Of Beryllium With
Substoichiometric extraction of cations with mixtures of hexafluoroacetylacetone and tri-n-octylphosphine oxide in cyclohexane. Analytical Chemistry 1974 , 46 (4) , 503-508.
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Substoichiometric Determination Of Manganese By Neutron
A simple and rapid method for the substoichiometric determination of traces of manganese in various materials by neutron-activation analysis has been developed. After dissolution of the irradiated test sample, manganese(II) carrier is added and subsequently oxidised by peroxodisulphate to the heptav
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Precipitant To E Tract Copper From Nitric Acid Solution
Sep 21, 2021 The extraction of copper(II) from nitrate/nitric acid aqueous solutions using Acorga M5640 has been studied. The metal extraction rate has been examined and also the effect of the aqueous pH, and metal and extractant concentrations. The increase of temperature increases copper extraction ( H 0 kJ mol 1).
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Determination Of Gold By Substoichiometric Extraction With
Jun 05, 2011 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.
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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 ...
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Substoichiometric Extraction Of Goldiii 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
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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
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Substoichiometric Neutron Activation Determination Of Gold
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.
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Substoichiometric Determination Of Gold By Neutron
A rapid method has been developed for the determination of gold in catalyst samples by thermal neutron-activation analysis incorporating substoichiometric solvent extraction of Au/III/ with 1,2,3-benzotriazole /1,2,3-BT/ into n-butanol. The time required for radiochemical purification and counting of two samples and a standard was 1 h.
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The Substoichiometric Determination Of Gold In Iron By
Two of the above methods have been applied for the determination of gold in iron. One of them (I) is the direct substoichiometric extraction in which gold is extracted immediately after solving the sample of iron with gold carrier and adjusting the hydrochloric
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Some Singular Features Of Gold Catalysis Protection Of
In the case of total extraction of the halide, as in catalysis, the hypothetical ... Gold protection with substoichiometric AsPh 3 requires a different explanation. ... the reaction after the first addition is too fast to allow determination of its initial rate by NMR, but at least it can be concluded that the initial slope should be larger ...
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Determination Of Mercury By Displacement Substoichiometric
Determination of mercury by displacement substoichiometric extraction with labeled silver dithizonate in chloroform Appl Radiat Isot. 2009 Feb67(2)256-8. doi 10.1016/j.apradiso.2008.06.046. Epub 2008 Nov 8. Authors M Mandal 1 , S Basu. Affiliation 1 Department of ...
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Colloidal Au Replacement Assay For Highly Sensitive
Jun 19, 2007 A novel sensing method based on surface plasmon resonance (SPR) was developed for the highly sensitive quantification of low molecular weight (LMW) analytes (colloidal Au replacement assay). Gold nanoparticles (diameter 20 nm) functionalized with lactosyl-poly(ethylene glycol) (PEG) were prepared and were specifically adsorbed onto a Ricinus communis agglutinin (RCA120)
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Determination Of Mercury By Displacement Substoichiometric
The substoichiometric extraction of Hg2 using diethyldithiocarbamic acid and 203Hg tracer was studied. Chloroform was employed to remove the complexes from
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Application Of L3 4dimethylphenyldodecanedionel 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 ...
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Extraction Of Reduced Molybdosilicic Acid And Its
Substoichiometric determination of traces of gold by radioactive isotope-dilution analysis. Beardsley DA, Briscoe GB, Rzicka J, Williams M. Talanta, 14(8)879-886, 01 Aug 1967 Cited by 1 article
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Determination Of Copperii 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 * madhumita.mumugmail.com, ** basu_sukalyan yahoo.co.in Received June 18, 2012 AbstractA substoichiometric ...
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Gold Method Of Extraction
Method of Gold Extraction using Borax -Small Scale . Video embedded Eliminate Mercury using this method of gold extraction with borax for small-scale miners allows for fine gold recovery and better smelting. Inquire Now Gold cyanidation Wikipedia. It is the most commonly used leaching process for gold extraction. ...
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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.
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Lser Analysis Of Reactive Extraction Of Zn And Cu With Bis
Request PDF LSER analysis of reactive extraction of Zn and Cu with bis (2-ethylhexyl) phosphate (HDEHP) in six different diluents An equilibrium study on the reactive extraction of Zn and Cu ...
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Radiometric Determination Of Submicrogram Amounts Of
A radiometric method for the determination of submicrogram amounts of mercury (down to 5 x 10(-10)g ml ) is described. The method is based on the exchange reaction between mercury and silver-110m dithizonate. Only palladium, gold, silver, and large amounts of copper and bismuth interfere in the determination, and must be removed.
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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
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Determination Of Gold In Soils Presidents Message And
Determination of Gold in Soils and Sediments by Fire Assay or Aqua Regia Digestion continued from page 1 The March 2013 issue of EXPLORE features one technical article by Matt Leybourne and Sarah Rice of ALS Geochemistry that reviews the optimal methods
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Extraction Equilibrium And Simple Extractive
2.3 Recommended extraction procedures 2.3.1 Determination of the extraction equilibrium constants (KD, , Kex) Aliquot aqueous solutions of gold (III) ions (10 mL, 1-10g 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.
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