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Chromatographic purification of antimony for precise isotope analysis by MC-ICP-MS

Abstract

A two-step method for purifying Antimony (Sb) from geological samples for precise measurement of Sb isotopic composition using multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS) was developed. Sb was separated from matrix using two successive chromatographic columns loaded with AG 1-X4 and AG 50W-X8 resin, respectively. The separation method was calibrated using geological samples by assessing the extraction yield and the reproducibility of the measured isotopic composition, and resulted in a relatively lower procedure blank and better recovery (98.7% ± 5.6%, n=8, 2SD). The validation of the whole protocol, together with instrumental analysis, was confirmed by the investigation of the matrix effect and the result of a standard addition experiment. A combined sample-standard bracketing and external normalization (SSB-EN) method using Cd as an internal element was used for mass bias correction, which gives a reproducibility better than 0.04‰ (2SD). A variation of 0.29‰ of δ123Sb value (relative to NIST SRM 3102a standard) was observed in artificial and geological samples, implying the potential application of Sb isotopes in various environments.

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Article information


Submitted
01 Apr 2020
Accepted
18 May 2020
First published
18 May 2020

J. Anal. At. Spectrom., 2020, Accepted Manuscript
Article type
Paper

Chromatographic purification of antimony for precise isotope analysis by MC-ICP-MS

J. Liu, J. Chen, T. Zhang, Y. Wang, W. Yuan, Y. Lang, C. Tu, L. Liu and J. Birck, J. Anal. At. Spectrom., 2020, Accepted Manuscript , DOI: 10.1039/D0JA00136H

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