High-Precision Determination of the 238U/235U Isotope Ratio in Rocks by Multicollector Inductively Coupled Plasma Mass Spectrometry

The paper describes the high-precision U-isotope analysis of rocks. The analysis is based on multicollector inductively coupled plasma mass spectrometry (MC−ICP−MS) and includes, as an essential part, the three-step ion-exchange chromatography separation of uranium from chemically complex solutions....

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Bibliographic Details
Published in:Journal of analytical chemistry (New York, N.Y.) N.Y.), 2018-12, Vol.73 (14), p.1334-1342
Main Authors: Mandzhieva, G. V., Sadasyuk, A. S., Chernyshev, I. V., Shatagin, K. N., Chugaev, A. V., Gareev, B. I.
Format: Article
Language:English
Subjects:
Analytical Chemistry
Chemistry
Chemistry and Materials Science
Emission spectroscopy
Fractionation
Inductively coupled plasma mass spectrometry
Ion exchange
Isotope composition
Isotopes
Mass spectrometry
Organic chemistry
Rocks
Scientific imaging
Uranium
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Summary:The paper describes the high-precision U-isotope analysis of rocks. The analysis is based on multicollector inductively coupled plasma mass spectrometry (MC−ICP−MS) and includes, as an essential part, the three-step ion-exchange chromatography separation of uranium from chemically complex solutions. In the analysis, the 235 U and 238 U mass-bias of the MC−ICP−MS is corrected against the reference ratio of 233 U and 236 U in a double-spike added. The doublespiking precedes sample chemical digestion. This approach is useful as it corrects isotope data for a possible U-isotope fractionation that could have occurred in the chemical preparation of samples. The double-spike 236 U/ 233 U is 1.03183 ± 0.00005. The extraction procedure ensures uranium yield of more than 80%. The accuracy of the analysis was estimated by the study of 238 U/ 235 U in an international standard sample IRMM-3184 as well as in monitor samples. The uncertainty was estimated at ±0.008% (2SD), which is comparable with the accuracy of the results previously published by foreign researches. The analysis was elaborated for studying natural 238 U/ 235 U ratio variations. It was used by the authors for the high-precision determination of the U-isotope composition in rocks (granites, shales, volcanic rocks) and U-bearing minerals.
ISSN:1061-9348
1608-3199
DOI:10.1134/S106193481814006X