Chemical separation of Mo and W from terrestrial and extraterrestrial samples via anion exchange chromatography.
Chemical separation of Mo and W from terrestrial and extraterrestrial samples via anion exchange chromatography.
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DOI：
10.1021/ac404223t
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发表时间：
2014-05
影响因子：
7.4
通讯作者：
Y. Nagai;T. Yokoyama
中科院分区：
文献类型：
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作者：
Y. Nagai;T. Yokoyama
采用Eichrom 1 × 8型阴离子交换树脂，建立了一种新的两段化学分离方法，用于分离四种天然岩石样品中的钼和钨。首先，使用HCl、HNO 3和HF，测定各种化学条件下的9种元素（Ti、Fe、Zn、Zr、Nb、Mo、Hf、Ta和W）的分配系数。在此基础上，提出了沿着Ti-Zr-Hf族分离的Mo和W两段化学分离新工艺：0.4 M HCl-0.5 M HF（主量元素），9 M HCl-0.05 M HF（Ti-Zr-Hf），9 M HCl-1 M HF（W），6 M HNO 3 -3 M HF（Mo）。在化学过程之后，使用9 M HCl-3 M HF分离W级分中剩余的Nb。另一方面，使用2 M HF和6 M HCl-0.1M HF除去残留在Mo级分中的Nb和Zn。这种技术的性能进行了评估，这些元素从两个地球和两个外星样品分离。对于所有检查的样品，Mo、W、Zr和Hf的回收率接近100%。用于化学分离程序的空白中Zr、Hf、W和Mo的总含量分别为582、9、29和396 pg。因此，我们的新分离技术可广泛应用于地球化学，宇宙化学和环境科学的各个领域，特别是用于这些元素的多同位素分析，从一个单一的样品具有显着的内部同位素不均匀性。
A new two-stage chemical separation method was established using an anion exchange resin, Eichrom 1 × 8, to separate Mo and W from four natural rock samples. First, the distribution coefficients of nine elements (Ti, Fe, Zn, Zr, Nb, Mo, Hf, Ta, and W) under various chemical conditions were determined using HCl, HNO3, and HF. On the basis of the obtained distribution coefficients, a new technique for the two-stage chemical separation of Mo and W, along with the group separation of Ti-Zr-Hf, was developed as follows: 0.4 M HCl-0.5 M HF (major elements), 9 M HCl-0.05 M HF (Ti-Zr-Hf), 9 M HCl-1 M HF (W), and 6 M HNO3-3 M HF (Mo). After the chemical procedure, Nb remaining in the W fraction was separated using 9 M HCl-3 M HF. On the other hand, Nb and Zn remaining in the Mo fraction were removed using 2 M HF and 6 M HCl-0.1 M HF. The performance of this technique was evaluated by separating these elements from two terrestrial and two extraterrestrial samples. The recovery yields for Mo, W, Zr, and Hf were nearly 100% for all of the examined samples. The total contents of the Zr, Hf, W, and Mo in the blanks used for the chemical separation procedure were 582, 9, 29, and 396 pg, respectively. Therefore, our new separation technique can be widely used in various fields of geochemistry, cosmochemistry, and environmental sciences and particularly for multi-isotope analysis of these elements from a single sample with significant internal isotope heterogeneities.