Analysis of uranium in the insoluble residues after decomposition of soil samples by various techniques

Jurečič, S.; Benedik, Ljudmila; Planinšek, Petra; Nečemer, Marijan; Kump, P.; Pihlar, Boris

doi:10.1016/j.apradiso.2013.11.077

Cited by 19 publications

(12 citation statements)

References 14 publications

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“…The influence of the content of silicon on the determination of uranium activity in soil samples may be crucial, and has been investigated by Jurecic et al [17]. They analysed soil samples with various silicon content using an acid leaching and a microwave digestion method, with mixtures of acids that included HF.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of two radiochemical procedures for the determination of uranium and thorium isotopes in coal samples

Lourtau

Montero

2015

J Radioanal Nucl Chem

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Two procedures are presented for the sequential determination of uranium and thorium isotopes in coals. They are based on acid leaching on a hot plate, and on acid digestion in closed vessels using microwave irradiation. Both were applied to the analysis of International Atomic Energy Agency (IAEA) and National Institute of Standards and Technology (NIST) reference materials, and to the study of coals with different ranks. The greatest recoveries were obtained with the acid digestion method. This method was more effective than the leaching method for the extraction of the uranium isotopes in coals. The effectiveness of the thorium isotopes extraction was similar in the two methods.

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Section: Resultsmentioning

confidence: 99%

Evaluation of two radiochemical procedures for the determination of uranium and thorium isotopes in coal samples

Lourtau

Montero

2015

J Radioanal Nucl Chem

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“…Without accounting for plasma fractionation behaviors or detector calibration, using the ratio of the raw signals for U-238 to U-235 (i.e., 1.08), one can multiply the moles of U-235 from the spike to get an approximation for the moles of U-238 in the sample and hence a mass concentration of 131 g g - The latter may be a concern in a liquid nebulization approach if a solid dissolution method failed to fully solubilize and recover uranium or other elements of interest. 10,11 Matrix investigation using LIBS…”

Section: Smt-la-icp-ms On Certified Uranium Ore With Tracermentioning

confidence: 99%

“…The most common approaches include dissolution in boiling acids at atmospheric pressure, microwave assisted acid digestion in high-pressure apparatus, or alkali fusion followed by aqueous dissolution. [10][11][12] Often multiple steps in sequence are required. It has been noted that even conventional methods, especially those with liquid acids, do not always fully solubilize and recover uranium (or other refractory elements) from a solid sample.…”

Section: Introductionmentioning

confidence: 99%

“…It has been noted that even conventional methods, especially those with liquid acids, do not always fully solubilize and recover uranium (or other refractory elements) from a solid sample. [10][11][12] Recently, the use of molten ammonium bifluoride (ABF) was introduced as a means of breaking down sample matrixes before chemical analysis. 13 Molten ammonium bifluoride at 230 o C can break down mineral samples rapidly, without open boiling acids, high-pressure apparatus, or the addition of large masses of solid alkali.…”

Section: Introductionmentioning

confidence: 99%

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Solid matrix transformation and tracer addition using molten ammonium bifluoride salt as a sample preparation method for laser ablation inductively coupled plasma mass spectrometry

Grate

González

O’Hara

et al. 2017

Analyst

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Solid sampling and analysis methods, such as laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS), are challenged by matrix effects and calibration difficulties. Matrix-matched standards for external calibration are seldom available and it is difficult to distribute spikes evenly into a solid matrix as internal standards. While isotopic ratios of the same element can be measured to high precision, matrix-dependent effects in the sampling and analysis process frustrate accurate quantification and elemental ratio determinations. Here we introduce a potentially general solid matrix transformation approach entailing chemical reactions in molten ammonium bifluoride (ABF) salt that enables the introduction of spikes as tracers or internal standards. Proof of principle experiments show that the decomposition of uranium ore in sealed PFA fluoropolymer vials at 230 °C yields, after cooling, new solids suitable for direct solid sampling by LA. When spikes are included in the molten salt reaction, subsequent LA-ICP-MS sampling at several spots indicate that the spikes are evenly distributed, and that U-235 tracer dramatically improves reproducibility in U-238 analysis. Precisions improved from 17% relative standard deviation for U-238 signals to 0.1% for the ratio of sample U-238 to spiked U-235, a factor of over two orders of magnitude. These results introduce the concept of solid matrix transformation (SMT) using ABF, and provide proof of principle for a new method of incorporating internal standards into a solid for LA-ICP-MS. This new approach, SMT-LA-ICP-MS, provides opportunities to improve calibration and quantification in solids based analysis. Looking forward, tracer addition to transformed solids opens up LA-based methods to analytical methodologies such as standard addition, isotope dilution, preparation of matrix-matched solid standards, external calibration, and monitoring instrument drift against external calibration standards.

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“…Jurečič et al [9] studied several soil decomposition techniques and found that alkaline fusion digested uranium in the soils studied completely. Other techniques, such as conventional wet dissolution with mixtures of HNO 3 , HClO 4 and HF acids, microwave dissolution using HNO 3 and HF were less effective, with uranium losses of 35-60 %.…”

Section: Introductionmentioning

confidence: 99%

Rapid method to determine actinides and 89/90Sr in limestone and marble samples

Maxwell

Culligan

Hutchison

et al. 2016

J Radioanal Nucl Chem

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A new method for the determination of actinides and radiostrontium in limestone and marble samples has been developed that utilizes a rapid sodium hydroxide fusion to digest the sample. Following rapid pre-concentration steps to remove sample matrix interferences, the actinides and 89/90 Sr are separated using extraction chromatographic resins and measured radiometrically. The advantages of sodium hydroxide fusion versus other fusion techniques will be discussed. This approach has a sample preparation time for limestone and marble samples of\4 h.

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Analysis of uranium in the insoluble residues after decomposition of soil samples by various techniques

Cited by 19 publications

References 14 publications

Evaluation of two radiochemical procedures for the determination of uranium and thorium isotopes in coal samples

Evaluation of two radiochemical procedures for the determination of uranium and thorium isotopes in coal samples

Solid matrix transformation and tracer addition using molten ammonium bifluoride salt as a sample preparation method for laser ablation inductively coupled plasma mass spectrometry

Rapid method to determine actinides and 89/90Sr in limestone and marble samples

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