Automatic Purification of Li Isotopes from Geological Samples by High-Pressure Ion Chromatography

YANG Yini; WANG Shuangshuang; WEI Xiaoyan; LI Yanguang; LI Weiliang; JIN Mengqi; JIAO Xin

doi:10.15898/j.ykcs.202407310165

2025 Vol. 44, No. 2

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YANG Yini, WANG Shuangshuang, WEI Xiaoyan, LI Yanguang, LI Weiliang, JIN Mengqi, JIAO Xin. Automatic Purification of Li Isotopes from Geological Samples by High-Pressure Ion Chromatography[J]. Rock and Mineral Analysis, 2025, 44(2): 230-244. doi: 10.15898/j.ykcs.202407310165

Citation:

YANG Yini, WANG Shuangshuang, WEI Xiaoyan, LI Yanguang, LI Weiliang, JIN Mengqi, JIAO Xin. Automatic Purification of Li Isotopes from Geological Samples by High-Pressure Ion Chromatography[J]. Rock and Mineral Analysis, 2025, 44(2): 230-244. doi: 10.15898/j.ykcs.202407310165

Automatic Purification of Li Isotopes from Geological Samples by High-Pressure Ion Chromatography

1.
State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069, China
2.
Xi’an Center, China Geological Survey, Xi’an 710119, China
3.
Centre for Orogenic Belt Geology, China Geological Survey, Xi’an 710119, China

More Information

Corresponding author: WANG Shuangshuang, sharonwang84@sina.com

Received Date: 31 July 2024

Revised Date: 14 November 2024

Accepted Date: 20 November 2024

Available Online: 15 January 2025

Publish Date: 20 March 2025

Abstract

Abstract

High-quality purification of lithium (Li) is crucial in measuring ⁷Li/⁶Li ratios of whole rocks precisely by MC-ICP-MS. Many scholars have proposed traditional manual Li purification methods by cross-combining the types of eluents, types of resin, resin particle size, column tube size, and resin volume. However, the process is still cumbersome. In contrast, high-pressure ion chromatography (HP-IC) provides single-step separation, shorter durations, and online quantification; it is underutilized due to insufficient systematic research on its elution processes. Here, an automatic purification method of Li by HP-IC was established by optimizing IC parameters, laying a foundation for the wide application of IC in the field of isotope purification. The testing results of Li collections for four national geological standard samples indicate that the recovery rate exceeds 99.3%, and the blank measurement is lower than that of the traditional manual column method. The amount of separated Li also meets the demand of MC-ICP-MS for Li isotope analysis. The BRIEF REPORT is available for this paper at http://www.ykcs.ac.cn/en/article/doi/10.15898/j.ykcs.202407310165.
- Li isotope /
- high-pressure ion chromatography /
- cation ion chromatographic column /
- acid tolerance /
- sample-loading capacity /
- recovery rate

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References

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