Rapid Purification of Sr and Nd for Isotope Analysis with Multiple-column Method

ZHU Zhi-yong; PAN Chen-xu; ZHU Xiang-kun

doi:10.15898/j.cnki.11-2131/td.201908120126

Rock and Mineral Analysis > 2020 > 39(4): 515-524. > DOI: 10.15898/j.cnki.11-2131/td.201908120126

ZHU Zhi-yong, PAN Chen-xu, ZHU Xiang-kun. Rapid Purification of Sr and Nd for Isotope Analysis with Multiple-column Method[J]. Rock and Mineral Analysis, 2020, 39(4): 515-524. DOI: 10.15898/j.cnki.11-2131/td.201908120126

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Rapid Purification of Sr and Nd for Isotope Analysis with Multiple-column Method

Key Laboratory of Isotope Geology, Ministry of Natural Recourses; Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

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Received Date: August 11, 2019
Revised Date: November 25, 2019
Accepted Date: April 15, 2020
Published Date: June 30, 2020

Abstract

Highlights
(1) The serial use of cation resin and special resin chromatography column can shorten the sample separation and purification time.

(2) The detachable serial chromatography column avoids the influence of sulfate on the special resin.

(3) The chemical procedure proposed in this study could be used for separating Sr from Rb and Nd from Sm effectively.

ABSTRACT

BACKGROUNDThe Sr and Nd isotopic compositions of a sample depend on its initial isotopic ratios, the ratios between the parent nuclide and daughter product, and the decay time. Due to their significance for the tracing of reservoirs, they were widely applied in the geological studies. Traditional cation resin was applied to purify Sr and Nd for isotope analysis, which involved the organic reagent and pH adjustment. The complex chemical procedure was time-consuming. In recent years, the appearance of special resins has made it easy to separate these elements. However, due to the influence of sulfates and other factors, the use of special resins is limited.
OBJECTIVESTo shorten the chemical purification time of Sr and Nd, and to avoid the damage of sulfate ions on the Sr and REE specific resins, we proposed a new chemical purification method, where multiple columns were utilized.
METHODSThe method combines cationic resin and special resin to realize the rapid separation of Sr and Nd and can extend the using time of special resin. The experiment uses cationic resin, Sr special resin and LN rare earth special resin to analyze the basalt standard BCR-2.
RESULTSThe recoveries of Sr and Nd with this method were larger than 90%. The ⁸⁷Sr/⁸⁶Sr and ¹⁴³Nd/¹⁴⁴Nd isotope ratios were 0.705016±0.000016 (n=36, 1SD) and 0.512624±0.000012 (n=39, 1SD), respectively, which were in coincidence with the values previously reported by TIMS method within the analytical error. The complied ⁸⁷Sr/⁸⁶Sr and ¹⁴³Nd/¹⁴⁴Nd isotope ratios obtained TIMS were 0.705000-0.705023 and 0.512630-0.512650, respectively. The ⁸⁵Rb/⁸⁶Sr and ¹⁴⁷Sm/¹⁴⁴Nd rations of the purified Sr and Nd solution were less than 0.01 and 0.001, respectively.
CONCLUSIONSThe proposed chemical purification procedure can efficiently separate Rb, Sr, Sm and Nd, and realize the accurate analysis of Sr and Nd isotopes.
- Sr-Nd isotopes,
- specific resins,
- tailing,
- in-series columns method,
- rapid purification

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References (38)

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