Analytical Chemistry of Niobium and Tantalum details the methods in understanding the chemistry of niobium and tantalum, which includes separation, identification, and quantification. The text first discusses the general topics about niobium and tantalum, …
contents greater than 1 % (m/m) (annex B) and a photometric method for the determination of tantalum contens less than 1 % (m/m) (annex CL The methods are applicable to ferroniobium having niobium contents between 40 and 75 % (m/m), tantalum contents between 0,25
Tantalum, niobium, thorium and uranium contents of 21 columbite-tantalite minerals from the Akim Oda District of Ghana have been determined using epithermal instrumental neutron activation analysis (ENAA) with a conventional counting system. As thermal neutron filters, boron carbide was encapsulated in the irradiation vials during irradiation. The samples were irradiated at one of the outer ...
A fast analytical method for the determination of niobium and tantalum in ores and special alloys by inductively coupled plasma atomic emission spectrometry has been developed. Optimum conditions for the determination of both metals in the plasma were worked out and possible interferences were studied before attempting the determination in the real samples. Ores are dissolved in a mixture of ...
2013-10-15 · The method permits determination of tantalum in niobium and its compounds at the level of 10 −3 %, with relatively good precision (≤8% RSD) and accuracy (recovery of tantalum: 0.9–1.1). Relative differences in the results by the two independent methods (ICP-OES and ICP-MS) do not exceed 14%, and the presence (at comparable concentrations ...
DETERMINATION OF NIOBIUM AND TANTALUM 5 10 15 20 5 10 15 20 A/mm A/mm Fig. 1. Dependence of the signal intensity of 1. background and 2. peaks on the observation height for a) Nb and b) Та. 1.2 U 1.6 1.8 R.f. power/kW
Ferroniobium — Determination of niobium content — Gravimetric method. Specifies a photometric method for the determination of the titanium content (annex A), a gravimetric method for the determination of tantalum contents greater than 1 % (m/m) (annex B) and a photometric method for the determination of tantalum contents less than 1 % (m/m) (annex C).
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1999-7-30 · Determination of niobium(V) and tantalum(V) as 4-(2-pyridylazo)resorcinol-citrate ternary complexes in geological materials by ion-interaction reversed-phase high-performance liquid chromatography. Vachirapatama N(1), Macka M, Paull B, Münker C, Haddad PR.
Determination of niobium and tantalum with quinaldinohydroxamic acid Determination of niobium and tantalum with quinaldinohydroxamic acid Majumdar, A.; Pal, Bijoli 1961-03-01 00:00:00 Department of Inorganic and Analytical Chemistry, Jadavpur University, Calcutta ([ndia) Determination of 5Tiobium and Tantalum with Quinaldinohydroxamic Acid By A. K. MAJUMDAR a n d BIJOLI K. 1)AL (Received July ...
Determination of niobium, tantalum, zirconium and hafnium in geological materials by extraction chromatography and inductively coupled plasma mass spectrometry May …
2020-3-6 · ：GB/T 15076.4-2020. ： 4: 1,10—. ：Methods for chemical analysis of tantalum and niobium—Part 4:Determination of iron content—1,10-Phenanthroline spectrophotometry. ： .
The determination of tantalum and niobium. A review - Analyst (RSC Publishing) Issue 1037, 1962. Previous Article.
2012-1-9 · Determination of Niobium and Tantalum in Titanium-Base Alloys John L. Hague and Lawrence A. Machlan A procedure for t he determin ation of niobium and tantalum in titanium-base alloys is described. The sample is dissolved in a mixture of hydrochloric and hydrofluoric acid, and oxidized with a minimum of nitric acid.
Evaluation of processing routes for the conversion of niobium and tantalum bearing minerals to high purity oxides can be performed at various scales. Specific processing unit operations include comminution, sensor-based sorting, flotation, dry or wet magnetic separation, leaching, solvent extraction (SX), precipitation and crystallization.
A spectrophotometric method for the determination of 0.0005-0.10% of manganese in high-purity niobium, tantalum, molybdenum and tungsten metals is described. The matrix materials are separated from the manganese by extraction as cupferrates, after sample dissolution, then the red complex formed between manganese(II) and 1-(2-pyridylazo)-2 ...
2006-8-30 · Abstract. Determination of Niobium(V) and Tantalum(V) as 2-(5-bromo-2- pyridylazo)-5-diethylaminophenol (Br-PADAP)-Citrate Ternary Complexes in Geological Materials using Ion-Interaction Reversed-Phase High-Performance Liquid Chromatography N. Vachirapatama I / E Doble 1 / Z. S. Yu 2 / P. R. Haddad 1. 1Separation Science Group, School of Chemistry, University of Tasmania, GPO Box …
Tantalum–niobium (Ta–Nb) ore is the main source of two very important rare metals,Ta and Nb. However, it is still a challenge for laser-induced breakdown spectroscopy (LIBS) to quantitatively detect trace Ta and Nb elements in Ta–Nb ore samples. In this work, LIBS assisted with univariate and multivariate calibration methods that were used to quantitatively determine Ta and Nb elements ...
Part 7. Determination of iron content Inductively Coupled Plasma Atomic Emission Spectrometry 1 Scope This method specifies iron tantalum, niobium determination of iron content in iron ore concentrate. This method is suitable for iron, tantalum, niobium, iron ore concentrate iron contents. Determination of the range of 0.50% to 20.00%.
CONSIDERABLE work has been done in the past decade on the separation and determination of relatively small amounts of tantalum and niobium. However, no …
2020-3-6 · ：GB/T 15076.11-2020. ：Methods for chemical analysis of tantalum and niobium—Part 11:Determination of arsenic,antimony,lead,tin and and bismuth contents in niobium—Direct current arc atomic emission spectrometry.
A multichannel x-ray spectrograph has been applied to the determination of the combined oxides of zirconium, tungsten, vanadium, iron, titanium, tantalum, and niobium.
Quantitative analysis of tantalum-niobium systems is difficult by standard chemical methods. X-ray fluorescence has been used successfully under carefully controlled conditions (2)(3)(4)(5)(6). To avoid potential problems such as matrix effects and the high dependence on the method of sample preparation inherent in this technique neutron ...
The determination of tantalum and niobium. A review - Analyst (RSC Publishing) Issue 1037, 1962. Previous Article.
Tantalum–niobium (Ta–Nb) ore is the main source of two very important rare metals,Ta and Nb. However, it is still a challenge for laser-induced breakdown spectroscopy (LIBS) to quantitatively detect trace Ta and Nb elements in Ta–Nb ore samples. In this work, LIBS assisted with univariate and multivariate calibration methods that were used to quantitatively determine Ta and Nb elements ...
Tantalum, niobium, thorium and uranium contents of 21 columbite-tantalite minerals from the Akim Oda District of Ghana have been determined using epithermal instrumental neutron activation analysis (ENAA) with a conventional counting system. As thermal neutron filters, boron carbide was encapsulated in the irradiation vials during irradiation.
A procedure for the determination of niobium and tantalum in titanium- base alloys is described. The sample is dissolved in a mixture of hydrochloric and hydrofluoric acid, and oxidized wilh a minimum of nitric acid. The resulting solution is transferred to a column containing a strong quaternary amine anion- exchange resin (Dowex-1).
2002-5-1 · Spectrophotometric Determination of Tantalum in Iron, Steel, and Niobium Metal.. Analytical Chemistry 1962, 34 (6), 618-621. DOI: 10.1021/ac60186a009.
Mixed-ligand complexes of niobium and tantalum, readily extracted into chloroform, are formed at excess triphenylguanidine (TPG) and thiocyanate in strongly acidic solutions. The molar ratios of the components in the extracted complexes are Nb:SCN - :TPG=1
2002-5-6 · Determination of niobium, tantalum, zirconium and hafnium in geological materials by extraction chromatography and inductively coupled plasma mass spectrometry Author links open overlay panel X.J. Yang a b C. Pin a
2015-7-16 · Dissolution and Quantification of Tantalum-Containing Compounds: Comparison with Niobium Thomas A. Theron1, Motlalepula Nete1, Johan A. Venter1, Walter Purcell1* and Johan T. Nel2 1Department of Chemistry, University of the Free State, Bloemfontein, 9300, South Africa. 2The South African Nuclear Energy Corporation Ltd. (Necsa), P.O. Box 582, Pretoria 0001, South Africa.
We have developed a rapid and accurate method to determine Zr, Nb, Hf and Ta (denoted as HFSE) in geological samples by inductively coupled plasma-mass spectrometry fitted with a flow injection syste...
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