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Potassium isotopic compositions of international geological reference materials
Ying-Kui Xu;  Yan Hu;   Xin-Yang Chen;  Tian-Yi Huang;  Ronald S. Sletten;  Dan Zhu;  , Fang-Zhen Teng
2019
Source PublicationChemical Geology
Volume513Pages:101–107
Abstract

There is a renewed interest in K isotope geochemistry driven by the advances in analytical precision and it is emerging as a useful tracer in a variety of disciplines ranging from Earth sciences to biology. However, highquality K isotopic data for reference materials are still limited but highly needed. Here, we report high-precision stable K isotopic compositions (δ41K) for 23 commercially available international reference materials, including igneous, sedimentary, and metamorphic rocks, as well as an in-house seawater standard. Potassium in digested samples was separated by cation-exchange chromatography with Bio-Rad AG50W-X8 (200–400 mesh) resin in 0.5 N HNO3 media. Potassium isotopes were measured on a Nu Plasma II high-resolution MC-ICPMS. The reproducibility of K isotopic analysis, based on over one year of measurements of pure K solutions and rock standards, was ≤0.06‰ (95% confidence interval). Synthetic solutions made by mixing single element standards to represent various rock matrices confirmed the accuracy of our methods. The 23 reference materials have δ41K values ranging from −0.562‰ to −0.253‰ and the seawater standard has a much higher δ41K value of 0.143‰. The comprehensive dataset presented here provides a reference for quality control and inter-laboratory comparison of high-precision K isotopic analyses for future studies.

KeywordPotassium Isotopes mc-icpms reference Materials seawater
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/10552
Collection月球与行星科学研究中心
Affiliation1.Center for Lunar and Planetary Sciences, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
2.Isotope Laboratory, Department of Earth and Space Sciences, University of Washington, Seattle, WA 98195, USA
3.CAS Center for Excellence in Comparative Planetology, China
4.Quaternary Research Center, Department of Earth and Space Sciences, University of Washington, Seattle, WA 98195, USA
5.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
Recommended Citation
GB/T 7714
Ying-Kui Xu;Yan Hu; Xin-Yang Chen;Tian-Yi Huang;Ronald S. Sletten;Dan Zhu;, Fang-Zhen Teng. Potassium isotopic compositions of international geological reference materials[J]. Chemical Geology,2019,513:101–107.
APA Ying-Kui Xu;Yan Hu; Xin-Yang Chen;Tian-Yi Huang;Ronald S. Sletten;Dan Zhu;, Fang-Zhen Teng.(2019).Potassium isotopic compositions of international geological reference materials.Chemical Geology,513,101–107.
MLA Ying-Kui Xu;Yan Hu; Xin-Yang Chen;Tian-Yi Huang;Ronald S. Sletten;Dan Zhu;, Fang-Zhen Teng."Potassium isotopic compositions of international geological reference materials".Chemical Geology 513(2019):101–107.
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