Rapid and precise determination of Sr and Nd isotopic ratios in geological samples from the same filament loading by thermal ionization mass spectrometry employing a single-step separation scheme
Rapid and precise determination of Sr and Nd isotopic ratios in geological samples from the same filament loading by thermal ionization mass spectrometry employing a single-step separation scheme
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采用单步分离方案，通过热电离质谱法快速、精确地测定来自相同灯丝负载的地质样品中的 Sr 和 Nd 同位素比率
DOI：
10.1016/j.aca.2012.03.040
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发表时间：
2012-05-21
影响因子：
6.2
通讯作者：
Yang, Yue-Heng
中科院分区：
文献类型：
--
作者：
Li, Chao-Feng;Li, Xian-Hua;Yang, Yue-Heng
热电离质谱法（TIMS）对地质样品的Nd同位素比值分析具有良好的精密度和准确度，但该方法劳动强度大、成本高、耗时长。本研究提出了一种新的TIMS分析方案，旨在提高分析效率和降低实验成本。采用一步阳离子交换树脂技术，将Sr和稀土元素（RE）混合组分从基质中分离并蒸发至干燥。然后，将混合的Sr + REEs级分溶解并使用1 μ L的2 M HCl加载到相同的Re细丝上。然后，在不排气的情况下使用TIMS依次测量Sr和Nd。与传统的TIMS方法相比，这种分析协议的优点是它的成本和节省时间的适应。我们的方法的适用性进行评估，通过重复测量Sr-87/Sr-86和Nd-143/Nd-144的9个国际硅酸盐岩石参考材料，跨越了广泛的散装组成。本研究中的典型内部精密度约为。对Sr-87/Sr-86和Nd-143/Nd-144标准样品的分析结果与文献值吻合较好，表明该方法的有效性。(C)2012爱思唯尔有限公司版权所有。
Thermal ionization mass spectrometry (TIMS) offers the excellent precision and accuracy of the Stand Nd isotopic ratio analysis for geological samples, but this method is labour intensive, expensive and time-consuming. In this study, a new analytical protocol by TIMS is presented that aims at improving analytical efficiency and cutting down experimental cost. Using the single-step cation exchange resin technique, mixed Sr and rare earth elements (REEs) fractions were separated from matrix and evaporated to dryness. Afterwards, mixed Sr + REEs fractions were dissolved and loaded onto the same Re filament using 1 mu L of 2 M HCl. Then, Sr and Nd were sequentially measured without venting using TIMS. In contrast to conventional TIMS methods, the merits of this analytical protocol are its cost- and timesaving adaptations. The applicability of our method is evaluated by replicated measurements of Sr-87/Sr-86 and Nd-143/Nd-144 for nine international silicate rock reference materials, spanning a wide range of bulk compositions. The typical internal precision in this study is ca. 0.001% (RSE) for Sr-87/Sr-86 and Nd-143/Nd-144; the analytical results obtained for these standard rocks show a good agreement with reported values, indicating the effectiveness of the proposed method. (C) 2012 Elsevier B.V. All rights reserved.