Rapid Purification of Sr and Nd for Isotope Analysis with Multiple-column Method
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摘要: 样品放射性成因Sr-Nd同位素比值受控于源区初始同位素组成、放射性元素母体与子体相对丰度，以及衰变时间等因素。它们具有极强的示踪能力，因而在地质学领域有广泛的应用。传统的Sr-Nd同位素分析使用的是阳离子树脂，提纯Nd元素时往往涉及有机试剂以及调节pH值等操作，其分析效率较低。近年来特效树脂的出现使得分离这些元素变得简单，但是受硫酸根等因素影响，特效树脂使用次数有限。为了提高分析效率，缩短分析时间，本文开发了一种套柱法，该方法结合阳离子树脂和特效树脂，实现了Sr-Nd元素的快速分离，并且能延长特效树脂的使用寿命。实验采用阳离子树脂、Sr特效树脂和LN稀土特效树脂对玄武岩BCR-2标样进行了分析。Sr-Nd回收率均>90%，BCR-2玄武岩87Sr/86Sr比值为0.705016±0.000016（n=36，1SD），143Nd/144Nd比值为0.512624±0.000012（n=39，1SD），与前人TIMS法获得的结果吻合（87Sr/86Sr：0.705000~0.705023；143Nd/144Nd：0.512630~0.512650）。最终分离提纯的溶液中85Rb/86Sr值小于0.01，147Sm/144Nd值小于0.001，表明该方法可以高效分离Rb-Sr和Sm-Nd，实现Sr、Nd同位素的准确分析。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. -
Key words:
- Sr-Nd isotopes /
- specific resins /
- tailing /
- in-series columns method /
- rapid purification
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