| 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 |
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| Rapid Purification of Sr and Nd for Isotope Analysis with Multiple-column Method |
| Received:August 12, 2019 Revised:November 26, 2019 |
| DOI：10.15898/j.cnki.11-2131/td.201908120126 |
| Key words: Sr-Nd isotopes specific resins tailing in-series columns method rapid purification |
| Author Name | Affiliation | | ZHU Zhi-yong | Key Laboratory of Isotope Geology, Ministry of Natural Recourses
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China | | PAN Chen-xu | Key Laboratory of Isotope Geology, Ministry of Natural Recourses
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China | | ZHU Xiang-kun | Key Laboratory of Isotope Geology, Ministry of Natural Recourses
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China |
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| Abstract: |
BACKGROUND: The 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.
OBJECTIVES: To 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.
METHODS: The 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.
RESULTS: The 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.
CONCLUSIONS: The proposed chemical purification procedure can efficiently separate Rb, Sr, Sm and Nd, and realize the accurate analysis of Sr and Nd isotopes. |
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