A simple single-stage extraction method for Mo separation from geological samples for isotopic analysis by MC-ICP-MS
A simple single-stage extraction method for Mo separation from geological samples for isotopic analysis by MC-ICP-MS
复制标题
一种简单的单级萃取方法，用于从地质样品中分离钼，并通过 MC-ICP-MS 进行同位素分析
DOI：
10.1039/c9ja00267g
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发表时间：
2020
影响因子：
3.4
通讯作者：
Lu Yang
中科院分区：
文献类型：
--
作者：
Lanping Feng;Lian Zhou;Wenfeng Hu;Wen Zhang;Baichan Li;Yongsheng Liu;Zhaochu Hu;Lu Yang
介绍了一种从复杂地质样品中分离钼的新方法，该方法简单、有效，可用于高精度钼同位素比值的测量。所提出的分离方法受益于TRU树脂的高选择性和高容量，其提供了从复杂样品基质中直接分离Mo，并且仅使用单一无机酸HCl（1.5 M用于加载和0.5 M用于洗脱）和小体积就实现了高产率（约100%）、有效分离和低空白。与常用的分离方案相反，氧化还原试剂（例如，H2 O2和抗坏血酸）也不需要高毒性HF，使得该分离方法简单且操作更环保。钼同位素比值的测定采用多接收电感耦合等离子体质谱法（MC-ICP-MS），使用97 Mo-100 Mo双加标结合标准样品交叉进样进行质量偏差校正。对火成岩、锰结核、页岩和海水样品的分析结果与以前报道的值吻合得很好，证实了所提出的分离方案适用于复杂的样品基质，并将进一步促进其地质应用。
A new, simple and efficient separation method to isolate Mo from complex geological sample matrices for high precision Mo isotope ratio measurements is described. The proposed separation method benefits from the high selectivity and high capacity of the TRU resin, which affords straightforward separation of Mo from complex sample matrices and achieves high yield (∼100%), efficient separation and low blank with the use of only a single mineral acid, HCl (1.5 M for loading and 0.5 M for eluting), and small volumes. As opposed to the commonly used separation protocols, neither redox reagents (e.g., H2O2 and ascorbic acid) nor highly toxic HF is required for the proposed separation protocol, making this separation method straightforward and more environment friendly to operate. Mo isotope ratios were measured by multi-collector inductively coupled plasma mass-spectrometry (MC-ICP-MS) using the 97Mo–100Mo double spike in combination with standard-sample bracketing for mass bias correction. The results obtained for igneous rocks, manganese nodules, shales and seawater samples are in good agreement with previously reported values, confirming that the proposed separation protocol is suitable for complex sample matrices and will further promote its geological applications.