Influence of hydrofluoric acid on extraction of thorium using a commercially available extraction chromatographic resin

Shimada, Asako; Hoshi, Akiko; Kameo, Yutaka; Nakashima, Miho

doi:10.1016/j.chroma.2009.03.019

Cited by 13 publications

(6 citation statements)

References 11 publications

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“…15 Fluoride ions form complexes with actinide ions, which pass through the TRU resin cartridge without retention. Accordingly, the F − was masked with Al 3+ , 20 by dissolving the residue of the digested solution of solidified products in 3 M HNO 3 containing 0.3 M ascorbic and 0.5 M Al(NO 3 ) 3 .…”

Section: ■ Results and Discussionmentioning

confidence: 99%

A New Method to Analyze ^242mAm in Low-Level Radioactive Waste Based on Extraction Chromatography and β-ray Spectrometry

2013

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A new method for identifying (242m)Am in low-level radioactive waste (LLW) using β-ray spectrometry is proposed. First, (152)Eu, (241+242m+243)Am, and (244)Cm in a digested solution of simulated LLW were separated from the major components of the digested solution and Pu using a transuranium element resin (TRU resin). Next, Am and Cm were separated from Eu using a tetravalent actinide element resin (TEVA resin). A β-ray spectrum of the fraction containing Am and Cm was recorded and the contribution of (239)Np, which is a daughter nuclide of (243)Am, was subtracted to determine the radioactivity of (242m)Am. Also mutual separation of Am, Cm, and Eu was carried out using a tertiary pyridine resin to determine (242m)Am by analyzing the increase of (242)Cm in the Am fraction just after separation of Am from Cm, which is the traditional method. The isotope ratio of (242m)Am/(241)Am determined by β-ray spectrometry agreed with that obtained by analyzing the traditional method.

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Section: ■ Results and Discussionmentioning

confidence: 99%

A New Method to Analyze ^242mAm in Low-Level Radioactive Waste Based on Extraction Chromatography and β-ray Spectrometry

2013

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“…That is why, alongside the highly developed spectrophotometric methods [ 95 ], the studied reagents are today widely used for preconcentration [ 96 ], with a view to the permanent development of new methods, including electrochemical, optode, electrochemical sensor and coupled spectral methods [ 110 , 111 , 112 , 113 , 114 , 115 , 116 , 117 , 118 , 119 , 120 , 121 , 122 , 123 , 124 , 125 , 126 , 127 , 128 , 129 , 130 , 131 , 132 , 133 , 134 ].…”

Section: Thorium Determinationmentioning

confidence: 99%

Thorium Removal, Recovery and Recycling: A Membrane Challenge for Urban Mining

Man,

Albu,

Nechifor

et al. 2023

Membranes

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Although only a slightly radioactive element, thorium is considered extremely toxic because its various species, which reach the environment, can constitute an important problem for the health of the population. The present paper aims to expand the possibilities of using membrane processes in the removal, recovery and recycling of thorium from industrial residues reaching municipal waste-processing platforms. The paper includes a short introduction on the interest shown in this element, a weak radioactive metal, followed by highlighting some common (domestic) uses. In a distinct but concise section, the bio-medical impact of thorium is presented. The classic technologies for obtaining thorium are concentrated in a single schema, and the speciation of thorium is presented with an emphasis on the formation of hydroxo-complexes and complexes with common organic reagents. The determination of thorium is highlighted on the basis of its radioactivity, but especially through methods that call for extraction followed by an established electrochemical, spectral or chromatographic method. Membrane processes are presented based on the electrochemical potential difference, including barro-membrane processes, electrodialysis, liquid membranes and hybrid processes. A separate sub-chapter is devoted to proposals and recommendations for the use of membranes in order to achieve some progress in urban mining for the valorization of thorium.

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“…Hydrolysis of uranium hexafluoride is sometimes accomplished by reaction of the UF 6 with pure water as it was here, and other times it is reacted with low molarity nitric acid solutions. Thorium is predominately in the 4 + oxidation state when it is in solution, and is very stable in solutions of nitrate, chloride, sulphate, and perchloric acids [18]. When uranium hydrolysis is carried out with nitric acid solutions, the resulting thorium compound is the highly soluble Th(NO 3 ) 4 .6H 2 O.…”

Section: Gasmentioning

confidence: 99%

230Th-234U and 231Pa-235U radiochronometry of hydrolyzed uranium hexafluoride gas

Harrison

Gaffney

2021

J Radioanal Nucl Chem

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Radiochronometry analyses of three hydrolyzed UF 6 gas samples were performed using the 230 Th-234 U and 231 Pa-235 U chronometers. All 230 Th-234 U model ages are younger than, and two of the three 231 Pa-235 U model ages overlap with, the known UF 6 gas transfer dates. The 230 Th-234 U discordance is caused by 8-10% 230 Th loss relative to the measurement reference date, likely during alkali hydrolysis. These results confirm that UF 6 gas transfers effectively purify uranium from daughter progeny. Daughter progeny fractionation can occur if solutions are not kept within optimal conditions post-UF 6 gas transfer and hydrolysis, and discordance between the 230 Th-234 U and 231 Pa-235 U chronometers may result from the laboratory procedures used to prepare samples.

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Influence of hydrofluoric acid on extraction of thorium using a commercially available extraction chromatographic resin

Cited by 13 publications

References 11 publications

A New Method to Analyze ^242mAm in Low-Level Radioactive Waste Based on Extraction Chromatography and β-ray Spectrometry

A New Method to Analyze ^242mAm in Low-Level Radioactive Waste Based on Extraction Chromatography and β-ray Spectrometry

Thorium Removal, Recovery and Recycling: A Membrane Challenge for Urban Mining

230Th-234U and 231Pa-235U radiochronometry of hydrolyzed uranium hexafluoride gas

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Influence of hydrofluoric acid on extraction of thorium using a commercially available extraction chromatographic resin

Cited by 13 publications

References 11 publications

A New Method to Analyze 242mAm in Low-Level Radioactive Waste Based on Extraction Chromatography and β-ray Spectrometry

A New Method to Analyze 242mAm in Low-Level Radioactive Waste Based on Extraction Chromatography and β-ray Spectrometry

Thorium Removal, Recovery and Recycling: A Membrane Challenge for Urban Mining

230Th-234U and 231Pa-235U radiochronometry of hydrolyzed uranium hexafluoride gas

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Product

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A New Method to Analyze ^242mAm in Low-Level Radioactive Waste Based on Extraction Chromatography and β-ray Spectrometry

A New Method to Analyze ^242mAm in Low-Level Radioactive Waste Based on Extraction Chromatography and β-ray Spectrometry