Pre-concentration of Ta(<scp>V</scp>) by solvent extraction before determination of trace amounts of Ta in Nb and Nb compounds

Turkowska, M.; Smolik, Marek

doi:10.1039/c6ay01231k

Cited by 2 publications

(5 citation statements)

References 16 publications

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“…Based on our previous studies of tantalum determination in the niobium matrix [41,42], depending on the tantalum content in niobium, Ta determination was performed using a Varian 810-MS inductively coupled plasma mass spectrometer (ICP-MS) (Varian, Palo Alto, CA, USA) (<3 ppm Ta in Nb) or a iCAP 7400+ MFC Duo inductively coupled plasma atomic emission spectrometer (ICP-AES) (Thermo) (>3 ppm Ta in Nb) equipped with a Duo EMT Torch Kit, cyclonic spray chamber, and sea spray nebulizer. The standards of tantalum with proper niobium matrix concentration were used.…”

Section: Apparatusmentioning

confidence: 99%

“…The standards of tantalum with proper niobium matrix concentration were used. The niobium compound used as the matrix was purified from Ta by solvent extraction [42]. The parameters for tantalum analysis using the ICP-AES apparatus were as follows: RF power 1.35 kW, plasma flow 12 L/min, coolant gas flow 14 L/min, auxiliary gas flow 0.5 L/min, nebulizer gas flow 0.4 L/min, pump rate 80 rpm, and emission lines λ Ta = 233.1, 240.0, and 263.5 nm.…”

Section: Apparatusmentioning

confidence: 99%

“…Nb-Ta solutions were prepared using a modular high pressure microwave digestion system (Multiwave 3000, Anton Paar, Graz, Austria) as described earlier [42]; briefly: The Nb and Ta pentoxide mixtures were digested with concentrated HF and HNO 3 acids (7:4 v/v) using high-pressure microwave system to obtain the sample of the requested Nb:Ta weight ratio (1:1 and 100:1); for samples of lower Nb:Ta ratio (1000:1) a standard tantalum solution was used instead of the solid Ta compound. The solutions were then evaporated, almost to dryness (the precipitate should stay slightly wet), to remove free fluoride ions, and diluted with water to proper volume.…”

Section: Feed Solution Preparationmentioning

confidence: 99%

“…The concentration of tantalum in the obtained solutions (after sorption and after desorption) was determined using the ICP-AES method. Standards of the same concentration of a stripping agent were used to eliminate matrix effects [42]. The desorption efficiency (DE (%)) was calculated using the Equation (3):…”

Section: Stripping Tantalum From Solvent-impregnated Active Coal (Bat...mentioning

confidence: 99%

“…These studies are intended to show the possibility of obtaining very pure niobium matrices, namely niobium compounds with a low Ta content, which are crucial for preparing matrix reference solutions or certified reference materials (CRMs). This should decrease the limit of quantification (LOQ) of tantalum in niobium using a direct instrumental method, namely ICP-OES, for the quantification level of LOQ ≤ 10 −4 % Ta per Nb, which is currently impossible due to the lack of availability of these products on the market [41,42].…”

Section: Introductionmentioning

confidence: 99%

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Solvent-Impregnated Sorbents for Tantalum from Niobium Separation Using a Fixed-Bed Column

et al. 2022

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Reactor-grade niobium steel is used as a construction material for nuclear reactors. In this case, the presence of tantalum, which is characterized by a 20 times higher active cross section for capturing thermal neutrons than the cross section of niobium (181Ta: 21.3 barn), cannot exceed 100 ppm. Analytical methods for quality and new separation method development control need very pure niobium matrices—niobium compounds with a low tantalum content, which are crucial for preparing matrix reference solutions or certified reference materials (CRMs). Therefore, in this paper, a new, efficient method for separating trace amounts of Ta(V) from Nb(V) using extraction chromatography with the use of sorbents impregnated with methyl isobutyl ketone MIBK solvent is proposed. Various types of MIBK-impregnated sorbents were used (AG® 1-X8 Anion Exchange Resin, AMBERLITE™ IRC120 Na Ion Exchange Resin, SERVACEL® Cellulose Anion Exchangers DEAE 52, active carbons of various grain size, carbonized blackcurrant pomace, carbonized chokeberry pomace, bentonite, and polyurethane foam in lumps). The highest tantalum removal efficiency was determined using active coal-based materials (>97%). The separation effectivity of tantalum from niobium was also determined in dynamic studies using a fixed-bed column with MIBK-impregnated active carbon. Solutions of various Nb:Ta weight ratios (1:1, 100:1, 1000:1) were used. The most impressive result was obtaining 70 mL of high purity niobium solution of tantalum content 0.027 ppm (in relation to Nb) with 88.4% yield of niobium from a solution of Nb:Ta, weight ratio 1000:1 (purge factor equaled 35,000). It proves the presented system to be applicable for preparation of pure niobium compounds with very low contents of tantalum.

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Section: Apparatusmentioning

confidence: 99%

Section: Apparatusmentioning

confidence: 99%

Section: Feed Solution Preparationmentioning

confidence: 99%

Section: Stripping Tantalum From Solvent-impregnated Active Coal (Bat...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Solvent-Impregnated Sorbents for Tantalum from Niobium Separation Using a Fixed-Bed Column

et al. 2022

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Современные Тенденции Применения И Аналитического Контроля Ниобия И Тантала. Краткий Обзор

Филиппов,

Межевая,

Барановская

2023

AnalyticsRussia

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Современная промышленность связана с применением не только новых перспективных материалов и технологий, но и развитием традиционных, эффективность которых подтверждена значительным производственным опытом. Краеугольным камнем большинства технологий является достоверность результатов аналитического контроля промышленного процесса. В работе рассмотрены отечественные и зарубежные требования к одним из наиболее востребованных видов редких тугоплавких металлов: ниобию и танталу, а также материалам на их основе. Показана стандартизованная нормативная база методик аналитического контроля. Обобщена информация о современных аналитических методах, опубликованных в периодической научно-технической литературе. Даны краткие описания методов и их характеристики. Анализ способов контроля ниобия и тантала и материалов на их основе выявил наиболее распространенные методы (ИСП-АЭС, ИСП-МС) и присущие им достоинства и ограничения. Весьма выгодны и перспективны твердофазные методы анализа, а именно рентгенофлуоресцентный. Одновременное определение всех элементов, широкий диапазон концентраций от 10–4 до 100%, отсутствие длительной и трудоемкой пробоподготовки, экпрессность анализа, неразрушающий характер метода, отсутствие необходимости применять адекватные стандартные образцы в случае использования метода фундаментальных параметров (МФП) – все это является неоспоримым преимуществом РФА в характеризации ниобия и тантала, как и большинства других тугоплавких материалов.

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Pre-concentration of Ta(V) by solvent extraction before determination of trace amounts of Ta in Nb and Nb compounds

Cited by 2 publications

References 16 publications

Solvent-Impregnated Sorbents for Tantalum from Niobium Separation Using a Fixed-Bed Column

Solvent-Impregnated Sorbents for Tantalum from Niobium Separation Using a Fixed-Bed Column

Современные Тенденции Применения И Аналитического Контроля Ниобия И Тантала. Краткий Обзор

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