Characterization of the new isotopic reference materials IRMM-524A and ERM-AE143 for Fe and Mg isotopic analysis of geological and biological samples,Journal of Analytical Atomic Spectrometry

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Characterization of the new isotopic reference materials IRMM-524A and ERM-AE143 for Fe and Mg isotopic analysis of geological and biological samples
Journal of Analytical Atomic Spectrometry ( IF 3.1 ) Pub Date : 2020-09-02 , DOI: 10.1039/d0ja00225a
Claudia González de Vega _{1,

2,

3,

4,

5} , Stepan M. Chernonozhkin _{1,

2,

3,

4,

5} , Rosa Grigoryan _{1,

2,

3,

4,

5} , Marta Costas-Rodríguez _{1,

2,

3,

4,

5} , Frank Vanhaecke _{1,

2,

3,

4,

5}

Affiliation

Isotopic reference materials (IRMs) are crucial for securing accurate and precise isotope ratio measurements of non-traditional stable isotopic systems and for enabling comparison of isotope ratio data obtained at different labs. Fe and Mg isotopic analysis have gained considerable interest as it expands our understanding of critical geological and biological processes. However, the isotopic reference materials used for Fe (IRMM-014) and Mg (DSM3) isotopic analysis are either out of stock or not readily available. In this work, we report on the use of multi-collector inductively coupled plasma-mass spectrometry (MC-ICP-MS) for determination of the isotopic composition of the two new isotopic reference materials IRMM-524A and ERM-AE143, which can be used for high-precision isotopic analysis of Fe and Mg, respectively, instead of IRMM-014 and DSM3. The Fe isotopic composition of IRMM-524A, determined as the intercept of the best-fitting straight line (linear regression) through the data points for multiple reference materials of geological and biological origin, measured relative to both the conventional and new isotopic reference materials is δ⁵⁶Fe_IRMM-014 = −0.004 ± 0.014‰ (2SD) and δ⁵⁷Fe_IRMM-014 = +0.005 ± 0.024‰ (2SD), and thus, within the experimental uncertainty it is the same as the value for IRMM-014. Using the same regression method, ERM-AE143 is shown to be isotopically lighter than DSM3, with δ²⁶Mg_DSM3 = −3.295 ± 0.040‰ (2SD), and δ²⁵Mg_DSM3 = −1.666 ± 0.043‰ (2SD). These new reference materials can be recommended as secondary isotopic standards or as a replacement for the conventional or primary reference materials when these become exhausted. Additionally, we provide a comprehensive set of Fe and Mg isotopic compositions for 21 geological and 10 biological reference materials, as a contribution to the field of isotope geochemistry, as well as to the blooming field of isotope ratio applications in biomedicine.

中文翻译：

用于地质和生物样品中铁和镁同位素分析的新型同位素参考物质IRMM-524A和ERM-AE143的表征

同位素参考物质（IRM）对于确保对非传统稳定同位素系统的同位素比率测量进行准确和精确的测量，以及对在不同实验室获得的同位素比率数据进行比较至关重要。铁和镁同位素分析引起了人们的极大兴趣，因为它扩展了我们对关键地质和生物过程的理解。但是，用于Fe（IRMM-014）和Mg（DSM3）同位素分析的同位素参考材料要么缺货，要么不容易获得。在这项工作中，我们报告了使用多收集器电感耦合等离子体质谱法（MC-ICP-MS）测定两种新型同位素参考物质IRMM-524A和ERM-AE143的同位素组成，可以分别用于Fe和Mg的高精度同位素分析，而不是IRMM-014和DSM3。δ ⁵⁶的Fe _IRMM-014 = -0.004±0.014‰（2SD）和δ ⁵⁷的Fe _IRMM-014 = 0.005±0.024‰（2SD），因此，实验误差范围内是一样的IRMM-014的值。使用相同的回归方法，ERM-AE143被示出为比同位素DSM3打火机，具有δ ²⁶ Mg的_DSM3 = -3.295±0.040‰（2SD），和δ ²⁵ Mg的_DSM3= −1.666±0.043‰（2SD）。这些新的参考物质可被推荐作为次要同位素标准，或在用尽这些物质时替代常规或主要参考物质。此外，我们为21种地质和10种生物参考材料提供了一套完整的Fe和Mg同位素组成，对同位素地球化学领域以及在生物医学中同位素比率应用的新兴领域做出了贡献。

更新日期：2020-11-03

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