High-precision simultaneous determination of 147Sm/144Nd and 143Nd/144Nd ratios in Sm–Nd mixtures using multi-collector inductively coupled plasma mass spectrometry and its comparison to isotope dilution analysis
High-precision simultaneous determination of 147Sm/144Nd and 143Nd/144Nd ratios in Sm–Nd mixtures using multi-collector inductively coupled plasma mass spectrometry and its comparison to isotope dilution analysis
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DOI：
10.1016/j.sab.2012.11.004
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
Yue-heng Yang;Fu-Yuan Wu;Zhuyin Chu;Liewen Xie;Jin-Hui Yang
中科院分区：
文献类型：
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作者：
Yue-heng Yang;Fu-Yuan Wu;Zhuyin Chu;Liewen Xie;Jin-Hui Yang
这项工作首次证明了用多收集器电感耦合等离子体质谱(MC-ICPMS)同时测定Sm-Nd混合物中147Sm/144Nd和143Nd/144Nd比值的高精度的可行性和能力，不需要分离Nd和Sm，也不需要使用昂贵的富集峰。在用无干扰的147Sm/149Sm比值进行Sm质量分馏校正144Sm对144Nd的同位素谱干扰后，以146Nd/144Nd的自然常数作为内标，对质量判别进行了指数校正，而不假定Nd和Sm的质量偏差相同。通过对不同类型的Sm-Nd混合物的重复分析，获得了本方法的准确度和精密度，包括大范围的Sm/Nd(约0.1-1.0)或147Sm/144Nd(约0.06-0.62)，被发现可与经典的同位素稀释(ID)方法相媲美。与ID法相比，本方法具有样品输出量大的特点，可同时测定实际地质样品中的147Sm/144Nd和143Nd144Nd值。
This work demonstrates, for the first time, the feasibility and capability of the high-precision simultaneous determination of147Sm/144Nd and143Nd/144Nd ratios in Sm–Nd mixtures using multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS) without Nd and Sm separation and without the use of costly enriched spikes. Mass discrimination was exponentially corrected by applying the natural constant of146Nd/144Nd ratio as an internal standard, after correction of the isobaric interference of144Sm on144Nd using interference-free147Sm/149Sm ratio for Sm mass fractionation, without assuming identical mass bias of Nd and Sm. The accuracy and precision of the present protocol, obtained from replicate analyses of various types of Sm–Nd mixtures encompassing a wide range of Sm/Nd (ca. 0.1–1.0) or147Sm/144Nd ratios (ca. 0.06–0.62) was found to be comparable to the classic isotope dilution (ID) method. The present method is characterized by a higher sample throughput compared to the ID method, and shows great potential for the simultaneous determination of147Sm/144Nd and143Nd/144Nd ratios in real geological samples.