The determination of ultra-trace rare-earth elements in iron minerals via HR-ICP-MS following chemical purification by polyurethane foam,Journal of Analytical Atomic Spectrometry

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The determination of ultra-trace rare-earth elements in iron minerals via HR-ICP-MS following chemical purification by polyurethane foam
Journal of Analytical Atomic Spectrometry ( IF 3.1 ) Pub Date : 2020-07-08 , DOI: 10.1039/d0ja00119h
Yanhong Liu _{1,

2,

3,

4,

5} , Dingshuai Xue _{1,

2,

3,

4,

5} , Wenjun Li _{1,

2,

3,

4,

5} , Chaofeng Li _{1,

2,

3,

4,

5}

Affiliation

This study describes a simple and low-cost method that requires small samples (<20 mg) for the determination of rare-earth elements (REEs) in iron minerals using high-resolution inductively coupled plasma mass spectrometry (HR-ICP-MS) following chemical purification by polyurethane foam (PUF). Powdered samples were digested via a conventional dissolution protocol with a HF, HCl, and HNO₃ acid mixture. The elimination of matrix iron was performed using 0.14 g of PUF under the static sorption mode with 8 M HCl. To obtain a high iron removal rate, we investigated the separation conditions (e.g., HCl concentration and initial iron concentration). Under the optimized extraction conditions, the iron removal rate reached 98.8% ± 0.1% (n = 6, SD) and the REE recoveries were between 98% and 104%. Three reference materials, FER-1, FER-2 (from iron formations) and pyrite GBW07267, were used to validate and evaluate the feasibility and robustness of our protocol. Our results agreed well with previously reported values within error, and the precision relative standard deviation (RSD) values for most of the REEs were <5%. Our results showed that this simple method provides an efficient way to precisely determine ultra-low REEs in iron-rich monominerals. Compared with previous approaches, the current protocol can be applied to the analysis of limited or precious terrestrial and extraterrestrial iron-rich samples (e.g., Fe-olivine and meteorites).

中文翻译：

聚氨酯泡沫化学纯化后，通过HR-ICP-MS测定铁矿物质中的痕量稀土元素

这项研究描述了一种简单且低成本的方法，该方法需要使用少量样品（<20 mg），然后使用高分辨率电感耦合等离子体质谱法（HR-ICP-MS）测定铁矿中的稀土元素（REE）。通过聚氨酯泡沫（PUF）进行化学纯化。通过常规溶解方案，用HF，HCl和HNO ₃酸混合物消化粉末状样品。使用0.14 g PUF在静态吸附模式下用8 M HCl进行基体铁的消除。为了获得较高的铁去除率，我们研究了分离条件（例如HCl浓度和初始铁浓度）。在最佳提取条件下，铁去除率达到98.8％±0.1％（n= 6，SD），REE回收率在98％至104％之间。三种参考材料FER-1，FER-2（来自铁层）和黄铁矿GBW07267被用于验证和评估我们方案的可行性和稳健性。我们的结果与先前报道的误差范围内的值非常吻合，并且大多数REE的精密度相对标准偏差（RSD）值均小于5％。我们的结果表明，这种简单的方法为准确测定富铁单矿物中的超低稀土元素提供了有效的方法。与以前的方法相比，当前协议可以应用于分析有限或珍贵的陆地和陆地外富铁样品（例如，铁橄榄石和陨石）。

更新日期：2020-07-08

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