Precise: δ 88/86Sr determination on a MC-ICP-MS by an improved method combining Zr-empirical external normalization isobaric interference correction and 84Sr-87Sr double spike

Hou Chun Liu, Yen Hong Chen, Chen Feng You, Chuan Hsiung Chung

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4 Citations (Scopus)

Abstract

The natural fractionation of stable Sr isotopes (δ88/86Sr) has attracted increasing attention as it serves as a new tracer to explore the biogeochemical process or source identification of Sr. As its applications have been expanded in various research fields, a highly efficient, accurate, and precise analytical method for δ88/86Sr determination is bound to be needed. To date, the most accurate and precise δ88/86Sr determination is performed by using the double spike (DS) technique in thermal ionization mass spectrometry (TIMS). However, TIMS suffers from long data acquisition time compared to multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS). In this paper, we present a novel approach, combining the use of Zr isotope empirical external normalization (EEN) for Kr and Rb isobaric interference correction and 84Sr-87Sr DS to overcome the severe mass bias effects on the measured 88Sr/86Sr ratios, to improve the analytical accuracy of δ88/86Sr determination by MC-ICP-MS. The δ88/86Sr of the IAPSO seawater standard was determined to be 0.37‰ ± 0.03 (2SD, n = 16) with an internal precision better than ±0.01‰ (2SE). By applying this new EEN-DS MC-ICP-MS method, the accuracy is significantly improved, which is comparable to DS TIMS.

Original languageEnglish
Pages (from-to)2322-2329
Number of pages8
JournalJournal of Analytical Atomic Spectrometry
Volume36
Issue number11
DOIs
Publication statusPublished - 2021 Nov

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Spectroscopy

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