A re-assessment of nickel-doping method in iron isotope analysis on rock samples using multi-collector inductively coupled plasma mass spectrometry

A re-assessment of nickel-doping method in iron isotope analysis on rock samples using multi-collector inductively coupled plasma mass spectrometry
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多接收器电感耦合等离子体质谱法对岩石样品铁同位素分析中镍掺杂方法的重新评估

DOI:
10.1007/s11631-019-00392-4
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发表时间:
2020-01
期刊:
影响因子:
1.6
通讯作者:
Yaoling Niu
Yaoling Niu
中科院分区:
地球科学4区
文献类型:
--
作者:
Hongmei Gong;Pengyuan Guo;Shuo Chen;Meng Duan;Pu Sun;Xiaohong Wang;Yaoling Niu

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在分析铁同位素组成时,元素掺杂被证明是一种有效的校正质量偏倚分馏的方法。我们提出了一个系统的重新评估如何掺杂镍可能影响铁同位素分析在这项研究中进行了几个实验。我们发现了影响分析结果的三个重要因素,即分析物溶液中的Ni:Fe比、未知样品与标准溶液的Ni:Fe比的匹配以及样品与标准溶液的Fe浓度的匹配。因此,在分析前将Ni加入分析物Fe溶液时需要谨慎。采用该方法测定的美国地质调查局标准W-2a、BHVO-2、BCR-2、AGV-2和GSP-2的δ56Fe和δ57Fe值与文献推荐值一致,δ56Fe和δ57Fe的长期(1年)外部重现性分别优于0.03和0.05‰(2SD)。因此,本实验室建立的分析方法是地质材料中大量铁同位素数据的首选方法。
Element doping has been proved to be a useful method to correct for the mass bias fractionation when analyzing iron isotope compositions. We present a systematic re-assessment on how the doped nickel may affect the iron isotope analysis in this study by carrying out several experiments. We find three important factors that can affect the analytical results, including the Ni:Fe ratio in the analyte solutions, the match of the Ni:Fe ratio between the unknown sample and standard solutions, and the match of the Fe concentration between the sample and standard solutions. Thus, caution is required when adding Ni to the analyte Fe solutions before analysis. Using our method, the δ56Fe and δ57Fe values of the USGS standards W-2a, BHVO-2, BCR-2, AGV-2 and GSP-2 are consistent with the recommended literature values, and the long-term (one year) external reproducibility is better than 0.03 and 0.05‰ (2SD) for δ56Fe and δ57Fe, respectively. Therefore, the analytical method established in our laboratory is a method of choice for high quantity Fe isotope data in geological materials.
用于铁、铜和锌同位素测量的玄武岩和溶液参考物质
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