改进的两柱Cd色谱分离流程和高精度的Cd同位素分析

钟桥辉; 彭冰钰; 何炽凤; 郭家凯; 初高彬; 尹露; 李杰

doi:10.3799/dqkx.2025.122

Volume 50 Issue 7

Jul. 2025

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Article Navigation > Earth Science > 2025 > 50(7): 2511-2524

Zhong Qiaohui, Peng Bingyu, He Chifeng, Guo Jiakai, Chu Gaobin, Yin Lu, Li Jie, 2025. Improved Two⁃Column Cd Chromatographic Separation Procedure and High⁃Precision Cd Isotope Analysis. Earth Science, 50(7): 2511-2524. doi: 10.3799/dqkx.2025.122

Citation:

Zhong Qiaohui, Peng Bingyu, He Chifeng, Guo Jiakai, Chu Gaobin, Yin Lu, Li Jie, 2025. Improved Two⁃Column Cd Chromatographic Separation Procedure and High⁃Precision Cd Isotope Analysis. Earth Science, 50(7): 2511-2524. doi: 10.3799/dqkx.2025.122

Citation:

Zhong Qiaohui, Peng Bingyu, He Chifeng, Guo Jiakai, Chu Gaobin, Yin Lu, Li Jie, 2025. Improved Two⁃Column Cd Chromatographic Separation Procedure and High⁃Precision Cd Isotope Analysis. Earth Science, 50(7): 2511-2524. doi: 10.3799/dqkx.2025.122

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Improved Two⁃Column Cd Chromatographic Separation Procedure and High⁃Precision Cd Isotope Analysis

doi: 10.3799/dqkx.2025.122

Zhong Qiaohui^{1, 4
,
,},
Peng Bingyu^{1, 4},
He Chifeng^{1, 4},
Guo Jiakai^{1, 4},
Chu Gaobin²,
Yin Lu³,
Li Jie^{1
,
,}

1.
State Key Laboratory of Deep Earth Processes and Resources, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
2.
Guangzhou Tuoyan Analytical Technology Co. Ltd., Guangzhou 510640, China
3.
Hebei Key Laboratory of Strategic Critical Mineral Resources, Hebei GEO University, Shijiazhuang 050031, China
4.
College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100101, China

Received Date: 2025-06-05
Available Online: 2025-07-29
Publish Date: 2025-07-25

Abstract

Abstract

Accurate and high-precision analysis of Cd isotope composition in geological and environmental samples is of great significance for the study of marine primary productivity, paleoenvironmental changes, traceability of heavy metal Cd pollution, genesis of sulfide deposits, and marine Cd cycles. However, the low Cd content and complex matrix of environmental and geological samples pose challenges to high-precision Cd isotope analysis. For geological and environmental samples, this study developed an efficient and reliable two-column Cd chromatographic separation procedure and a high-precision Cd isotope determination method. In the first column of AG-MP-1M anion exchange resin, a large amount of the matrix, including ≥99% ratio of Sn, was removed first, then Cd and a small amount of Sn were rapidly eluted using 4 mL of 1M HNO₃ solution. Unlike the traditional second-column separation of Cd using TRU, Spec, UTVEA and BPHA extraction resins, in addition to Mo, Sn and Zr elements, TOPO resin can further separate other potential residual matrix elements such as Mg, Fe, Pb, Ti, V, Ag, Cu and Zn, etc., without causing problems with resin-derived organic matter. Cadmium isotope ratio was conducted on Neptune Plus MC-CP-MS, using double spike method (¹¹¹Cd-¹¹³Cd) for instrumental mass discrimination correction. The long-term external reproducibility for two standard solutions (NIST SRM 3108 and Spex Cd) was better than ±0.05‰ (2SD).Geological and environmental standard samples processed by the presented two-column Cd chromatographic separation procedure and then determined the δ^114/110Cd_{NIST 3108} values are consistent with the values reported in the literature within uncertainty, confirming the accuracy, reliability and efficiency of this method. Furthermore, the Cd isotope compositions of the domestic geological standard samples GSR-2 and GSR-3, and soil standard sample GSS-6a are reported for the first time, which are beneficially for evaluating the analytical capabilities between different laboratories and data quality control. Overall, this study will provide efficient and convenient new technique for the accurate and high-precision Cd isotope analysis of geological and environmental samples.
- Cd isotope,
- TOPO resin,
- chromatographic separation,
- double spike method,
- geochemistry

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References(43)

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