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Article

A Microwave Digestion Technique for the Analysis of Rare Earth Elements, Thorium and Uranium in Geochemical Certified Reference Materials and Soils by Inductively Coupled Plasma Mass Spectrometry

by
Sharayu Kasar
,
Rajamanickam Murugan
,
Hideki Arae
,
Tatsuo Aono
and
Sarata Kumar Sahoo
*
Environmental Radionuclides Research Group, National Institutes for Quantum and Radiological Sciences and Technology (QST), Chiba 263-8555, Japan
*
Author to whom correspondence should be addressed.
Molecules 2020, 25(21), 5178; https://doi.org/10.3390/molecules25215178
Submission received: 25 September 2020 / Revised: 26 October 2020 / Accepted: 4 November 2020 / Published: 6 November 2020
(This article belongs to the Special Issue Advances and Future Trends in Inductively Coupled Plasma – Mass Spectrometry)
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Abstract

Two different digestion methods—microwave digestion (Mw) and Savillex digestion (Sx)—were used to evaluate the best quality control for analysis of the rare earth elements, Th and U in the geochemical certified reference material JSd-2, supplied by the Geological Survey of Japan (GSJ). The analysis of trace elements was carried out using inductively coupled plasma mass spectrometry (ICP-MS). The digestion recovery was > 90% for almost all elements by both methods. Mw-4 (four repeats of the microwave digestion) was found to be more effective and faster than Sx. In order to evaluate the efficiency of Mw-4, three other GSJ certified reference materials, JLk-1, JB-1 and JB-3, as well as five different soil samples from Belarus, Japan, Serbia and Ukraine were also analyzed. The Mw-4 method was seen to be promising for complete digestion and recovery of most of the elements. The U/Th ratio showed some heterogeneity for Ukraine and Serbia soils affected by Chernobyl nuclear power plant accident and depleted uranium contamination, respectively. This method can be successfully applied to any type of soils for elemental analyses.
Keywords: JSd-2; chemical digestion; rare earth elements; Th; U; ICP-MS JSd-2; chemical digestion; rare earth elements; Th; U; ICP-MS

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MDPI and ACS Style

Kasar, S.; Murugan, R.; Arae, H.; Aono, T.; Sahoo, S.K. A Microwave Digestion Technique for the Analysis of Rare Earth Elements, Thorium and Uranium in Geochemical Certified Reference Materials and Soils by Inductively Coupled Plasma Mass Spectrometry. Molecules 2020, 25, 5178. https://doi.org/10.3390/molecules25215178

AMA Style

Kasar S, Murugan R, Arae H, Aono T, Sahoo SK. A Microwave Digestion Technique for the Analysis of Rare Earth Elements, Thorium and Uranium in Geochemical Certified Reference Materials and Soils by Inductively Coupled Plasma Mass Spectrometry. Molecules. 2020; 25(21):5178. https://doi.org/10.3390/molecules25215178

Chicago/Turabian Style

Kasar, Sharayu, Rajamanickam Murugan, Hideki Arae, Tatsuo Aono, and Sarata Kumar Sahoo. 2020. "A Microwave Digestion Technique for the Analysis of Rare Earth Elements, Thorium and Uranium in Geochemical Certified Reference Materials and Soils by Inductively Coupled Plasma Mass Spectrometry" Molecules 25, no. 21: 5178. https://doi.org/10.3390/molecules25215178

APA Style

Kasar, S., Murugan, R., Arae, H., Aono, T., & Sahoo, S. K. (2020). A Microwave Digestion Technique for the Analysis of Rare Earth Elements, Thorium and Uranium in Geochemical Certified Reference Materials and Soils by Inductively Coupled Plasma Mass Spectrometry. Molecules, 25(21), 5178. https://doi.org/10.3390/molecules25215178

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