Precise and accurate determination of Sm, Nd concentrations and Nd isotopic compositions in geological samples by MC-ICP-MS
Precise and accurate determination of Sm, Nd concentrations and Nd isotopic compositions in geological samples by MC-ICP-MS
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DOI：
10.1039/c1ja00001b
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发表时间：
2011-06
影响因子：
3.4
通讯作者：
Yue-heng Yang;Zhuyin Chu;Fu-Yuan Wu;Liewen Xie;Jin-Hui Yang
中科院分区：
文献类型：
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作者：
Yue-heng Yang;Zhuyin Chu;Fu-Yuan Wu;Liewen Xie;Jin-Hui Yang
在这项工作中，我们建立了一个高重现性的Sm，Nd的浓度和Nd同位素组成的同位素稀释分析与MC-ICP-MS的分析。这种技术是优越的上级在分析的重现性或分析的快速性相比，四极杆ICP-MS或与热电离质谱（TIMS）同位素稀释技术。样品加标149 Sm-150 Nd富集示踪剂，然后用常用的HF，HNO 3和HClO 4酸方案消化。在标准阳离子交换树脂上从样品中分离出大量稀土元素（REEs），并在Eichrom Technologies Ln树脂上进一步纯化，以在质谱测量之前获得Sm和Nd馏分。对国际标准物质（CRM）的重复分析表明，我们获得的147 Sm/144 Nd和143 Nd/144 Nd同位素比值与同位素稀释法测得的值吻合得很好。除了测定Sm和Nd的浓度外，Nd同位素稀释运行期间还可以同时测量Nd同位素组成。此外，矿物Sm-Nd等时线年龄是相同的，在误差范围内，U-Th-Pb锆石年龄为同一岩石进一步测量和验证本协议的鲁棒性。因此，高的实际样品吞吐量固有的MC-ICP-MS可以充分利用的Sm和Nd的浓度和Nd同位素组成的测定。
In this work, we established a highly reproducible analysis of Sm, Nd concentrations and Nd isotopic compositions in geological samples by isotope dilution analysis with MC-ICP-MS. This technique is superior in terms of the analytical reproducibility or rapidity of analysis compared with quadrupole ICP-MS or with thermal ionization mass spectrometry (TIMS) isotope dilution techniques. Samples were spiked with 149Sm–150Nd enriched tracer and then digested by a commonly used HF, HNO3 and HClO4 acid protocol. The bulk rare earth elements (REEs) were separated from the sample on a standard cation exchange resin, and further purified on Eichrom Technologies Ln Resin, to obtain Sm and Nd fractions prior to mass spectrometric measurements. Replicate analyses of international certified reference materials (CRMs) demonstrate that our obtained 147Sm/144Nd and 143Nd/144Nd isotopic ratios are in good agreement with previously published values from isotope dilution methods. In addition to determining the concentrations of Sm and Nd, the Nd isotopic composition can be measured simultaneously during Nd isotope dilution run. Additionally, a mineral Sm-Nd isochronal age that is identical to, within error, a U-Th-Pb zircon age for the same rock is further measured and validates the robustness of the present protocol. Therefore, the high actual sample throughput inherent to the MC-ICP-MS can be fully exploited for the determination of Sm and Nd concentrations and Nd isotopic compositions.