A novel extraction chromatography and MC-ICP-MS technique for rapid analysis of REE, Sc and Y: Revising CI-chondrite and Post-Archean Australian Shale (PAAS) abundances
A novel extraction chromatography and MC-ICP-MS technique for rapid analysis of REE, Sc and Y: Revising CI-chondrite and Post-Archean Australian Shale (PAAS) abundances
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DOI：
10.1016/j.chemgeo.2011.08.011
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发表时间：
2012-01-06
期刊：
影响因子：
3.9
通讯作者：
Ireland, Thomas J.
中科院分区：
文献类型：
--
作者：
Pourmand, Ali;Dauphas, Nicolas;Ireland, Thomas J.
引入了一种新的分析方案，用于快速测量稀土元素 (REE)。通过多收集电感耦合等离子体质谱 (MC-ICP-MS) 分析钪和殷陨石和地质材料。设计了一个简单的纯化步骤来减少商用偏硼酸锂 (LiBO2) 中的 REE、Sc 和 Y 丰度，以实现低空白通量聚变。通过使用单一 TODGA 萃取色谱步骤实现了分析物与岩石基质的分离。开发了动态多收集杯配置，使用脱溶剂雾化器和标准样品包围技术测量 REE、Sc 和 Y。为了测试该分析方案的准确性，我们分析了 USGS 地质参考材料 BHVO-1、BIR-1、BCR-2、PCC-1、W-2、G-2 和 G-3 的等分试样，这些材料经过专门选择，涵盖各种 REE、Sc 和 Y 浓度和矿物成分。在分析不确定性范围内，参考材料中的元素丰度与通过各种 ICP-MS 技术分析的文献值的汇编是无法区分的。基于 G-3 的重复，REE、Sc 和 Y 浓度的平均外部再现性（报告为 RSD=100 x 标准差/平均值）类似于 2%。除了 REE 浓度较低的 PCC-1 之外，参考材料中多原子干扰和程序空白的调整可以忽略不计。为了重新考察 REE、Sc 和 Y 的陆地和宇宙丰度，九个太古代澳大利亚页岩 (PAAS)、Allende (CV-3)、Tagish Lake（C2-未分组）、Alais (CI1)、Orgueil 等分试样(CI1) 和 Ivuna (CI1) 陨石是使用我们新的分析程序进行测量的。与文献测量相比，PAAS 的 REE 模式（根据本研究中 CI 球粒陨石的平均值进行归一化）更平滑，并且显示出更小的离散度。这些样品中的 Eu/Eu*、Sigma LREE/Sigma HREE 和 La/Sc 比率保持恒定。基于这些新测量结果推荐的 PAAS 成分为（μ g g(-1)）：Sc = 15.89、Y = 27.31、La = 44.56、Ce = 88.25、Pr = 10.15、Nd = 37.32、Sm = 6.884、Eu = 1.215、Gd = 6.043、Tb = 0.8914， Dy = 5325，Ho = 1.052，Er = 3.075，Tm = 0.4510，Yb = 3.012，Lu = 0.4386。阿连德的 REE 模式与 II 族型富 Ca-Al 包裹体 (CAls) 相似，通常表现出轻稀土元素 (LREE) 富集、重稀土元素 (HREE) 贫化，以及 Eu 和 Tm 分别呈负异常和正异常。塔吉什湖和阿莱的稀土元素没有表现出明显的分馏，与奥盖伊观察到的相对平坦的模式非常相似。基于 Orgueil (n = 5)、Ivuna (n=2) 和 Alais (n = 1) 的八次高精度多收集 ICP-MS 测量，我们推荐用于 REE、Sc 和 Y 归一化的新 Cl 成分，并细化这些元素的宇宙丰度（单位为 mu g g(-1)）：Sc = 5.493、Y = 1.395、La = 0.2469、Cc = 0.6321、Pr = 0.0959、Nd = 0.4854、Sm = 0.1556、Eu = 0.0599、Gd = 0.2093、Tb = 0.0378、Dy = 0.2577、Ho = 0.0554、Er = 0.1667、Tm = 0.0261、Yb = 0.1694 和 Lu = 0.0256。 (C) 2011 Elsevier B.V. 保留所有权利。
A new analytical protocol is introduced for rapid measurement of rare-earth elements (REE). Sc and Yin meteoritic and geological materials by multi-collection inductively coupled plasma mass spectrometry (MC-ICP-MS). A simple purification step was devised to reduce REE, Sc and Y abundances in commercial lithium metaborate (LiBO2) for low-blank flux fusion. Separation of the analytes from the rock matrix was achieved by using a single TODGA extraction chromatography step. A dynamic multi-collector cup configuration was developed to measure REE, Sc and Y using a desolvating nebulizer and standard-sample bracketing technique. To test the accuracy of this analytical protocol, we analyzed aliquots of USGS geological reference materials BHVO-1, BIR-1, BCR-2, PCC-1, W-2, G-2 and G-3, specifically selected to encompass a wide range of REE, Sc and Y concentrations and mineral compositions. Elemental abundances in reference materials are indistinguishable within analytical uncertainties from compilations of literature values analyzed by various ICP-MS techniques. The average external reproducibility on REE, Sc and Y concentrations (reported as RSD=100 x standard deviation/average) was similar to 2% based on replicates of G-3. With the exception of PCC-1, which has low REE concentrations, adjustments for poly-atomic interferences and procedural blanks in the reference materials were negligible.In order to re-visit the terrestrial and cosmic abundances of REE, Sc and Y, aliquots of nine Post Archean Australian Shales (PAAS), Allende (CV-3), Tagish Lake (C2-ungrouped), Alais (CI1), Orgueil (CI1) and Ivuna (CI1) meteorites were measured using our new analytical procedure. The REE patterns of PAAS, normalized to the mean of CI-chondrites from this study, are smoother and show less dispersion compared with literature measurements. Eu/Eu*, Sigma LREE/Sigma HREE, and La/Sc ratios remain constant in these samples. The recommended PAAS composition based on these new measurements is (in mu g g(-1)): Sc = 15.89, Y = 27.31, La = 44.56, Ce = 88.25, Pr = 10.15, Nd = 37.32, Sm = 6.884, Eu = 1.215, Gd = 6.043, Tb = 0.8914, Dy = 5325, Ho = 1.052, Er = 3.075, Tm = 0.4510, Yb = 3.012 and Lu = 0.4386. The REE pattern in Allende is similar to group II-type Ca-Al-rich inclusions (CAls) that typically show enrichment in light REE (LREE), depletion in heavy REE (HREE), and negative and positive anomalies for Eu and Tm, respectively. The REE in Tagish Lake and Alais do not show significant fractionations and closely resemble the relatively flat pattern observed in Orgueil. Based on eight high-precision multi-collection ICP-MS measurements of Orgueil (n = 5), Ivuna (n=2) and Alais (n = 1), we recommend a new Cl-composition for REE, Sc and Y normalization and refine the cosmic abundances of these elements (in mu g g(-1)): Sc = 5.493, Y = 1.395, La = 0.2469, Cc = 0.6321, Pr = 0.0959, Nd = 0.4854, Sm = 0.1556, Eu = 0.0599, Gd = 0.2093, Tb = 0.0378, Dy = 0.2577, Ho = 0.0554, Er = 0.1667, Tm = 0.0261, Yb = 0.1694 and Lu = 0.0256. (C) 2011 Elsevier B.V. All rights reserved.