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A Chromatographic Approach for High-Precision Eu Isotope Analysis
Analytical Chemistry ( IF 6.7 ) Pub Date : 2024-09-12 , DOI: 10.1021/acs.analchem.4c03775 Hao Wu 1, 2 , Jiang-Hao Bai 1 , Xi-Rong Liang 1 , Xi-Bin Lu 1, 2 , Yi-Nan Deng 3 , Ming Li 4 , Jin-Long Ma 1 , Gang-Jian Wei 1
Analytical Chemistry ( IF 6.7 ) Pub Date : 2024-09-12 , DOI: 10.1021/acs.analchem.4c03775 Hao Wu 1, 2 , Jiang-Hao Bai 1 , Xi-Rong Liang 1 , Xi-Bin Lu 1, 2 , Yi-Nan Deng 3 , Ming Li 4 , Jin-Long Ma 1 , Gang-Jian Wei 1
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Eu isotopes are promising tracers across various scientific domains such as planetary, earth, and marine science, yet their high-precision analysis has been challenging due to the similar geochemical properties of rare earth elements (REEs). In this study, a novel two-column chromatographic approach was developed utilizing AG50W-X12 and TODGA resins to separate Eu effectively from matrix and interfering elements like Ba, Nd, Sm, and Gd, while ensuring high Eu yields (99.4 ± 0.4%, n = 19) and low blanks (<20 pg). The robustness of this method is evidenced by various rock types and different Eu loading masses. The efficient purification of Eu facilitated the establishment of a high-precision calibration technique with standard-sample bracketing (SSB) and internal normalization (Nd). When a Nu Plasma 1700 multicollector-inductively coupled plasma-mass spectrometry (MC-ICP-MS) instrument was employed, repeated purification and analysis of various Geological Reference Materials (GRMs) confirmed that the long-term external precision of δ153/151Eu is better than 0.04‰ (2 standard deviation (2SD)), which represents a 2–5-fold increase in precision compared to previously reported methods. Additionally, the high-precision Eu isotopic compositions of five GRMs, including basalts, andesite, syenite, and marine sediment, were measured. The high-precision Eu isotope techniques presented herein open up new avenues for Eu isotope geochemistry.
中文翻译：
高精度铕同位素分析的色谱方法
铕同位素是行星、地球和海洋科学等各个科学领域有前景的示踪剂，但由于稀土元素 (REE) 具有相似的地球化学性质，其高精度分析一直具有挑战性。在本研究中，开发了一种新型两柱色谱方法，利用 AG50W-X12 和 TODGA 树脂将 Eu 与基质和干扰元素（如 Ba、Nd、Sm 和 Gd）有效分离，同时确保高 Eu 收率（99.4 ± 0.4%， n = 19) 和低空白 (<20 pg)。各种岩石类型和不同的 Eu 加载质量证明了该方法的稳健性。 Eu的高效纯化促进了标准样品包围（SSB）和内部归一化（Nd）高精度校准技术的建立。当使用 Nu Plasma 1700 多接收器电感耦合等离子体质谱 (MC-ICP-MS) 仪器时，对各种地质标准物质 (GRM) 的重复纯化和分析证实，δ 153/151 Eu 的长期外部精度优于 0.04‰（2 个标准差 (2SD)），与之前报道的方法相比，精度提高了 2-5 倍。此外，还测量了玄武岩、安山岩、正长岩和海洋沉积物等五种 GRM 的高精度铕同位素组成。本文提出的高精度铕同位素技术为铕同位素地球化学开辟了新途径。
更新日期：2024-09-12
中文翻译：
高精度铕同位素分析的色谱方法
铕同位素是行星、地球和海洋科学等各个科学领域有前景的示踪剂，但由于稀土元素 (REE) 具有相似的地球化学性质，其高精度分析一直具有挑战性。在本研究中，开发了一种新型两柱色谱方法，利用 AG50W-X12 和 TODGA 树脂将 Eu 与基质和干扰元素（如 Ba、Nd、Sm 和 Gd）有效分离，同时确保高 Eu 收率（99.4 ± 0.4%， n = 19) 和低空白 (<20 pg)。各种岩石类型和不同的 Eu 加载质量证明了该方法的稳健性。 Eu的高效纯化促进了标准样品包围（SSB）和内部归一化（Nd）高精度校准技术的建立。当使用 Nu Plasma 1700 多接收器电感耦合等离子体质谱 (MC-ICP-MS) 仪器时，对各种地质标准物质 (GRM) 的重复纯化和分析证实，δ 153/151 Eu 的长期外部精度优于 0.04‰（2 个标准差 (2SD)），与之前报道的方法相比，精度提高了 2-5 倍。此外，还测量了玄武岩、安山岩、正长岩和海洋沉积物等五种 GRM 的高精度铕同位素组成。本文提出的高精度铕同位素技术为铕同位素地球化学开辟了新途径。
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