Quantitative Measurement of Rare Earth Elements in Brines: Isolation from the Charged Matrix Versus Direct LA‐ICP‐MS Measurements – A Comparative Study,Geostandards and Geoanalytical Research

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Quantitative Measurement of Rare Earth Elements in Brines: Isolation from the Charged Matrix Versus Direct LA‐ICP‐MS Measurements – A Comparative Study
Geostandards and Geoanalytical Research ( IF 2.7 ) Pub Date : 2021-01-29 , DOI: 10.1111/ggr.12376
Maria A. Kokh _{1,

2,

3} , Béatrice Luais ₄ , Laurent Truche ₂ , Marie Christine Boiron ₁ , Chantal Peiffert ₁ , Aimeryc Schumacher ₄

Affiliation

The quantification of the rare earth elements (REEs) in natural rocks and fluids is important not only for the sustainable use of geological resources but also for fundamental geological research. Due to significant improvements in experimental, modelling and analytical techniques, it was discovered that the REEs could be efficiently mobilised and transported by hydrothermal fluids. Thus, determining the REEs in fluids, especially in highly saline solutions, is a prerequisite to understand their fate in hydrothermal fluids. An analytical methodology was established to determine the trace quantities of the REEs in aqueous solutions with compositions typical to seawater and brines. The developed protocol was applied for the quantification of REEs in experimental sodium‐rich carbonate‐bearing hydrothermal solutions. For this purpose, we used two analytical approaches: (a) the REEs were chromatographically isolated from the charged matrix and introduced into a single collector quadrupole ICP‐MS and (b) direct determination of the REEs by LA‐ICP‐MS in experimental solutions loaded into glass capillaries without any additional isolation procedure. Both LA‐ICP‐MS and solution nebulisation ICP‐MS analysis after isolation of the REEs provide identical data in terms of REE concentrations in brines and are consistent within analytical uncertainties. Being an express method, LA‐ICP‐MS can be recommended for REE quantification in brines. At the same time, isolation of the REEs from the charged matrix with subsequent ICP‐MS measurement provides higher accuracy and precision, giving additional information for the REEs mass fractions that are below the detection limit of the LA‐ICP‐MS that was estimated at the ~ 10 ng g⁻¹ level.

中文翻译：

盐水中稀土元素的定量测量：带电基质的分离与直接LA-ICP-MS测量的比较研究

天然岩石和流体中稀土元素（REEs）的量化不仅对于可持续利用地质资源而且对于基础地质研究都具有重要意义。由于在实验，建模和分析技术方面的重大改进，人们发现稀土元素可以通过热液流体有效地动员和运输。因此，确定流体中，尤其是高盐溶液中的稀土元素是了解其在热液中的命运的前提。建立了一种分析方法来确定水溶液中痕量稀土元素的含量，这些元素的成分通常为海水和盐水。所开发的方案适用于实验性富碳酸钠含碳酸盐水热溶液中稀土元素的定量。以此目的，我们使用了两种分析方法：（a）从带电基质中色谱分离出稀土元素，并引入到单收集器四极杆ICP-MS中;（b）通过LA-ICP-MS直接测定加载到玻璃毛细管中的实验溶液中的稀土元素无需任何其他隔离程序。分离稀土元素后的LA‐ICP‐MS和溶液雾化ICP‐MS分析在盐水中的REE浓度方面提供了相同的数据，并且在分析不确定性内保持一致。作为一种快速方法，建议使用LA‐ICP‐MS进行盐水中的REE定量。同时，通过随后的ICP-MS测量将REE与带电基质隔离，可提供更高的准确度和精密度，^-1级。

更新日期：2021-01-29

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