Total-reflection X-ray fluorescence determination of thorium and uranium in the presence of interfering elements in solid geological objects of natural and technogenic origin

Literature Information

Publication Date 2023-11-13
DOI 10.1039/D3JA00260H
Impact Factor 4.023
Authors

Timur F. Akhmetzhanov, Tatiana Y. Cherkashina, Alena N. Zhilicheva, Victor M. Chubarov, Galina V. Pashkova


View Original

Abstract

The insufficient spectral resolution of the energy-dispersive total-reflection X-ray fluorescence spectrometer (TXRF) makes the quantitative determination of U and Th with the use of Lα lines a challenging task, especially in the case of analysis of natural solid samples with low concentrations of these elements. In this study, we used the PLS regression and the spectrum deconvolution to overcome the peak overlap problem (Th Lα overlaps with Fe Kα + Fe Kα and Rb Kα; U Lα overlaps with Rb Kα and Sr Kα). Samples of rocks, ashes, and ores with different amounts of interfering elements (Rb, Sr, and Fe) were prepared as suspensions for the direct TXRF determination of U and Th. We applied the PLS regression coupled to the special design of experiment (DoE) based on the low-correlated concentrations of U, Th, and Rb in the calibration set of samples. To validate our combination of the DoE, preprocessing procedure and PLS models, we used the independent test sets of the Rb-rich and Rb-depleted samples. Our study revealed that in the presence of considerable line overlapping the deconvolution leads to a significant systematic error (30–60%) within the low concentration range (10–30 ppm), while the PLS regression reduces the systematic error by 2–3 times. Additionally, we demonstrated that the borderline of the semi-quantitative and quantitative determination for the PLS regression is 3 and 10 times lower, respectively. We found that the high RSD of the Th concentrations found by the deconvolution reflects not a poor repeatability of the TXRF measurements, but a poor stability of the deconvolution. The application of the Rb-depleted test set helped us to demonstrate that the PLS regression does not improve the accuracy in the absence of strong line overlapping. In this study, we conclude that the best strategy for the determination of U in the Rb-depleted samples is the implementation of the deconvolution, while the determination of Th and U in the Rb-rich samples is best carried out with the PLS regression.

Related Literature

Contents pages

Other

DOI: 10.1039/AN99621BX007

Back matter

Other

DOI: 10.1039/AN99520BP007

Book reviews

Other

DOI: 10.1039/AN995200141N

Back matter

Other

DOI: 10.1039/AN99520BP013

Papers in future issues

Other

DOI: 10.1039/AN995200013N

Technical abbreviations and acronyms

Other

DOI: 10.1039/AN995200015N

Contents pages

Other

DOI: 10.1039/AN99520BX039

Back matter

Other

DOI: 10.1039/AN99621BP038

Quality Management in Drug Analysis

Paper

DOI: 10.1039/A700563F

You might also like

Compound Q&A

What precautions should be taken when handling lithium chloride hydrate (1:1:1) (CAS: 16712-20-2)?

When handling lithium chloride hydrate (1:1:1) (CAS: 16712-20-2), it is importan...

16712-20-2Lithium chloride hyd...
Compound Q&A

Is 4-(4H-1,2,4-Triazol-4-yl)piperidine (CAS: 690261-92-8) safe?

4-(4H-1,2,4-Triazol-4-yl)piperidine is generally considered safe for use in phar...

690261-92-84-(4H-1,2,4-Triazol-...
Compound Q&A

How should waste containing 1,3-Thiazole-2-carboxamide (CAS: 16733-85-0) be handled?

Waste containing 1,3-Thiazole-2-carboxamide (CAS: 16733-85-0) should be collecte...

16733-85-01,3-Thiazole-2-carbo...
Compound Q&A

What regulatory guidelines apply to 5-(Difluoromethyl)-2-fluorobenzonitrile (CAS: 934175-58-3)?

5-(Difluoromethyl)-2-fluorobenzonitrile (CAS: 934175-58-3) is subject to regulat...

934175-58-35-(Difluoromethyl)-2...
Compound Q&A

How is Methyl 3-acetamido-2-thiophenecarboxylate (CAS: 22288-79-5) typically synthesized?

Methyl 3-acetamido-2-thiophenecarboxylate can be synthesized by the reaction of ...

22288-79-5Methyl 3-acetamido-2...
Compound Q&A

What is 4-Isoquinolinecarbonitrile (CAS: 34846-65-6)?

4-Isoquinolinecarbonitrile is a chemical compound with the CAS number 34846-65-6...

34846-65-64-Isoquinolinecarbon...
Compound Q&A

How should Methyl 1H-1,2,3-triazole-4-carboxylate (CAS: 877309-59-6) be stored?

Store Methyl 1H-1,2,3-triazole-4-carboxylate (CAS: 877309-59-6) in a cool, dry p...

877309-59-6Methyl 1H-1,2,3-tria...
Compound Q&A

What regulatory guidelines apply to 6-Bromo[1,3]thiazolo[5,4-b]pyridin-2-amine (CAS: 1160791-13-8)?

6-Bromo[1,3]thiazolo[5,4-b]pyridin-2-amine (CAS: 1160791-13-8) is subject to the...

1160791-13-86-Bromo[1,3]thiazolo...
Compound Q&A

Is (2S,3S)-2-Ammonio-3-(3,4-dihydroxyphenyl)-3-hydroxypropanoate (CAS: 23651-95-8) safe?

(2S,3S)-2-Ammonio-3-(3,4-dihydroxyphenyl)-3-hydroxypropanoate (CAS: 23651-95-8) ...

23651-95-8(2S,3S)-2-Ammonio-3-...
Compound Q&A

What are the physical and chemical properties of 7-bromo-3-methyl-3,4-dihydroquinazolin-4-one (CAS: 1293987-84-4)?

7-Bromo-3-methyl-3,4-dihydroquinazolin-4-one is a solid with a crystalline form....

1293987-84-47-bromo-3-methyl-3,4...

Source Journal

Journal of Analytical Atomic Spectrometry

Journal of Analytical Atomic Spectrometry
CiteScore: 6.2
Self-citation Rate: 25.8%
Articles per Year: 254

The Journal of Analytical Atomic Spectrometry (JAAS) is the central journal for publishing innovative research on fundamentals, instrumentation, and methods in the determination, speciation and isotopic analysis of (trace) elements within all fields of application. This includes, but is not restricted to, the most recent progress, developments and achievements in all forms of atomic and elemental detection, isotope ratio determination, molecular analysis, plasma-based analysis and X-ray techniques. The journal welcomes full papers, communications, technical notes, critical and tutorial review articles, editorials, and comments, in addition to the Atomic Spectrometry Updates (ASU) literature reviews that are prepared by an expert panel. Submissions are welcome in the following areas, but note this list reflects the current scope and authors are strongly encouraged to contact the Editorial team if they believe that their work offers potentially new and emerging research relevant to the journal remit: Fundamental studies in the following. New and existing sources for atomic emission, absorption, fluorescence and mass spectrometry and those that provide both atomic and molecular information Sample introduction techniques for solids, liquids, gases Improvements in sensitivity, selectivity, precision, accuracy and/or robustness Isotope ratio measurements, including techniques for improving precision and mass bias correction Single channel and multichannel simultaneous detection systems Chemometrics, statistics, calibration techniques and internal standardisation Theoretical and numerical modelling of fundamental processes related to all of the above methodologies Novel or improved methodologies in areas of application including, but not limited to the following. Biosciences, including elemental, speciation and isotopic analysis in biological systems, immunoassays based on metal-labeled antibodies, bio-imaging, and nanoparticle toxicology Geochemistry Environmental science Materials science, including engineered nanoparticles and quantum dots Metrology, including reference materials Forensic analysis Food and agricultural sciences Energy Archaeometry Molecular analysis. Molecular sources for elemental and isotopic analysis Atomic sources for molecular analysis Atomic and molecular techniques simultaneously used for complementary chemical information All contributions are judged on originality and quality of scientific content, and appropriateness of length to content of new science.

Recommended Compounds

Recommended Suppliers

Disclaimer
This page provides academic journal information for reference and research purposes only. We are not affiliated with any journal publishers and do not handle publication submissions. For publication-related inquiries, please contact the respective journal publishers directly.
If you notice any inaccuracies in the information displayed, please contact us at support@chemtradehub.com. We will promptly review and address your concerns.