Quantitative Radiochemical Analysis by Ion Exchange.  Anion Exchange Behavior of Several Metal Ions in Hydrochloric, Nitric, and Sulfuric Acid Solutions

Bunney, L.R.; Ballou, N.E.; Pascual, Juan N.; Foti, S.

doi:10.1021/ac60147a001

Cited by 99 publications

(29 citation statements)

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“…Thus, e.g., in the extraction by triisooctylamin in xylene, K D for Pa increases from 1 at 4 M HCl to IO 3 at 12 M HCl, K D for Nb increases from 1 to 10 2 and K D for Ta is about 0.1 [4,5]. Extraction of traces of Nb, Ta and Pa by diisobutylcarbinol (DIBC) shows the same trend K D (Pa) K D (Nb) > tf D (Ta) [23], A similar relation, ^(Pa) K D (Nb) > Â" D (Ta), for traces of these elements was obtained in their extraction from HCl solutions by anion exchange resins [24][25][26][27], In these experiments, Ta was, however, much better extracted reaching the values of K D > 10 2 in 10 M HCl [25]. (Such a good extraction of Ta can be explained by the creation of mononuclear complexes.)…”

Section: Complexes Of Nb Ta and Pa In Hcl Solutions And Their Extracmentioning

confidence: 99%

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Solution Chemistry of Element 105 Part II: Hydrolysis and Complex Formation of Nb, Ta, Ha and Pa in HCl Solutions

Pershina

1998

Radiochimica Acta

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Element 105 / Hahnium / Transactinide chemistry / Relativistic molecular calculations / Complex formation SummaryCalculations of the electronic structure of hydrolyzed species of Nb, Ta, Pa and element 105, Ha, and of their various complexes formed in HCl solutions have been performed using the DiracSlater Discrete Variational method. On the basis of results of these calculations, relative values of the free energy change of reactions of complex formation have been determined. The order of the complex formation above 4 M HCl was found to be Pa > Nb > Ha > Ta. Such a sequence is defined by a predominant electrostatic energy of the metal-ligand interaction. The hydrolysis of compounds, as a reverse process, proved to change as Ta > Ha > Nb Pa, which is different from the hydrolysis of cations obeying the sequence Nb > Ta > Ha > Pa. Using the theory of metal extraction by anion exchange, the following trend in the extraction of the anionic species from the aqueous solutions above 4 M HCl has been predicted: Pa > Nb a Ha > Ta.

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Section: Complexes Of Nb Ta and Pa In Hcl Solutions And Their Extracmentioning

confidence: 99%

“…(26) Since the complex formation is a reverse process of the hydrolysis of the species, the latter influences K D on this step of the extraction.…”

Section: B Prediction Of the Extraction Of The Ha Complexesmentioning

confidence: 99%

Solution Chemistry of Element 105 Part II: Hydrolysis and Complex Formation of Nb, Ta, Ha and Pa in HCl Solutions

Pershina

1998

Radiochimica Acta

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“…The separation of 96 Zr-96 Nb from uranium fission products by ion exchange method has been reported by many investigators [1][2][3][4]. Most such work has concentrated on the use of organic exchangers, such as anion exchanger Dowex-2 with HCl solution, HN0 3 solution, H 2 S0 4 solution and HCl-ΗΓ solutions [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…Most such work has concentrated on the use of organic exchangers, such as anion exchanger Dowex-2 with HCl solution, HN0 3 solution, H 2 S0 4 solution and HCl-ΗΓ solutions [2][3][4]. The cation exchanger Dowex 50 · 8 HCl system has also been used for the separation of Zr -Nb from fission products [1], but both of them could not get highest radiochemical purity.…”

Section: Introductionmentioning

confidence: 99%

The Separation of ⁹⁵Zr and ⁹⁵Nb from Irradiated Uranium by Silica Gel Adsorption

Ting

1976

Radiochimica Acta

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Distribution coefficients have been measured of ruthenium, cerium, zirconium and niobium in the systems silica gel-nitric acid. Ruthenium and cerium had no significant adsorption. Zirconium showed an adsorption maximum at 1 Ν HNO,. The adsorption of niobium increases with increasing nitric acid concentration from 0.1 to 15 M. A rapid separation and determination of carrier free zirconium and niobium from irradiated uranium is evolved from the equilibrium data on silica gel-nitric acid. The chemical yield and the radiochemical purity of 85 Zr and 95 Nb are normally greater than 99%. ZusammenfassungEs wurden im System Silicagel-Salpetersäure Verteilungsfaktoren für Ru, Ce, Zr und Nb gemessen. Ru und Ce zeigten keine nennenswerte Adsorption. Zr zeigte Adsorptionsmaximum bei 1Ν HN0 3 . Die Adsorption von Nb steigt mit steigender Säurekonzentration von 0,1-15 M. Schnelle Trennung und Bestimmung von trägerfreienf'Zr und Nb aus bestrahltem Uran ergibt sich aus den Gleichgewichtsdaten. Ausbeute und Reinheit von 95 Zr und 95 Nb sind im allgemeinen besser als 99%. RésuméOn a mesuré les coefficients de répartition du ruthénium, du cérium, du zirconium et du niobium en système silicagel -acide nitrique. L'adsorption est insignifiante pour le ruthénium et le cérium. Pour le zirconium, elle est maximale avec 1Ν HN0 3 . Quant au niobium, elle augmente avec la concentration de l'acide nitrique de 0,1 à 15 M. La connaissance des données d'équilibre du système silicagel-acide nitrique facilite une séparation et une détermination rapides, sans porteurs, du zirconium et du niobium. Rendement et purité en isotopes 95 Zr et e5 Nb sont normalement supérieurs à 99%.

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“…The treatment for this kind of sample was usually directly operated in HNO3 system. Bunney 21 and Fairs 22 elucidated the anion exchange behavior of various elements in 0.1 -14 mol L -1 of HNO3 medium to achieve the radiochemical separations between them; Danon 23 observed that thorium is strongly adsorbed by anion exchange resin at high concentrations of HNO3, and the results were useful for the separation of thorium; Mohapatra 20 also reported an independent ion-exchange method for separation of Pu from a macro amount of Th in HNO3 medium. However, for the trace FPs associated with thorium matrix in HCl medium, there have been few studies on the removal of large amounts of thorium.…”

Section: Introductionmentioning

confidence: 99%

Determination of Trace Fission Products Associated with Thorium and HCl Matrix by Inductively Coupled Plasma Mass Spectrometry after Anion Exchange Separation

Chen

Zheng

et al. 2017

ANAL. SCI.

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For the determination of μg-mg L -1 of FPs in 100 g L -1 of thorium matrix with HCl medium, a method, including anionexchange pre-separation, evaporation and inductively coupled plasma mass spectrometry (ICP-MS) measurement, was developed. The procedure parameters, such as the matrix effect of thorium, the acidity of separation, the elution curve of thorium and FPs and the temperature of evaporation were optimized by batch equilibration, column elution and evaporation experiments. It was found that the average recovery of the FPs was in the range 80 -110%, and the RSD values were in the range 2 -15% utilizing prior anion exchange separation of FPs from thorium samples. Furthermore, the detection limit of the method was also investigated.

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Quantitative Radiochemical Analysis by Ion Exchange. Anion Exchange Behavior of Several Metal Ions in Hydrochloric, Nitric, and Sulfuric Acid Solutions

Cited by 99 publications

References 11 publications

Solution Chemistry of Element 105 Part II: Hydrolysis and Complex Formation of Nb, Ta, Ha and Pa in HCl Solutions

Solution Chemistry of Element 105 Part II: Hydrolysis and Complex Formation of Nb, Ta, Ha and Pa in HCl Solutions

The Separation of ⁹⁵Zr and ⁹⁵Nb from Irradiated Uranium by Silica Gel Adsorption

Determination of Trace Fission Products Associated with Thorium and HCl Matrix by Inductively Coupled Plasma Mass Spectrometry after Anion Exchange Separation

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Quantitative Radiochemical Analysis by Ion Exchange. Anion Exchange Behavior of Several Metal Ions in Hydrochloric, Nitric, and Sulfuric Acid Solutions

Cited by 99 publications

References 11 publications

Solution Chemistry of Element 105 Part II: Hydrolysis and Complex Formation of Nb, Ta, Ha and Pa in HCl Solutions

Solution Chemistry of Element 105 Part II: Hydrolysis and Complex Formation of Nb, Ta, Ha and Pa in HCl Solutions

The Separation of 95Zr and 95Nb from Irradiated Uranium by Silica Gel Adsorption

Determination of Trace Fission Products Associated with Thorium and HCl Matrix by Inductively Coupled Plasma Mass Spectrometry after Anion Exchange Separation

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The Separation of ⁹⁵Zr and ⁹⁵Nb from Irradiated Uranium by Silica Gel Adsorption