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Matrix effect investigation and accurate microanalysis of Sn isotopes in cassiterite and bronze by fsLA-MC-ICP-MS.

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Title: Matrix effect investigation and accurate microanalysis of Sn isotopes in cassiterite and bronze by fsLA-MC-ICP-MS.
Authors: Peng, Deyi1 (AUTHOR) geobza@126.com, Bao, Zhian1 (AUTHOR), Liu, Peng1 (AUTHOR), Yang, Wenqiang1 (AUTHOR), Chen, Kaiyun1 (AUTHOR), Yuan, Honglin1 (AUTHOR)
Source: JAAS (Journal of Analytical Atomic Spectrometry). May2026, Vol. 41 Issue 5, p1917-1927. 11p.
Subjects: Matrix effect, Tin isotopes, Cassiterite, Laser ablation inductively coupled plasma mass spectrometry, Isotopic fractionation, Calibration, Bronze, In situ microanalysis
Abstract: This study investigated matrix effects during in situ Sn isotope analysis using a femtosecond (fs) laser ablation system coupled to a multi-collector ICP-MS. Contrary to the common perception of "matrix-free" analysis, matrix effects are evident during in situ analysis. The measured δ124Sn/120Sn ratios of cassiterite and bronze deviated from the true values by up to 0.7‰ and 0.5‰, respectively, when using a pure tin metal as the bracketing standard. Introducing water vapour into the carrier gas substantially reduced these matrix effects, though minor deviations, from −0.24‰ to −0.33‰, persisted for cassiterite and bronze when tin metal was used as a non-matrix-matched calibration under wet plasma conditions, indicating that ablation-related processes also contribute to matrix effects. Therefore, matrix-matched reference materials are required for high-precision and accurate Sn isotope analyses of cassiterite and bronze samples. We evaluated four candidate samples, NWU-CAS (a natural cassiterite), NWU-Sn (tin metal plate), GBW02140 and GBW02137 (two certified bronze reference materials from the National Research Center for Certified Reference Material of China). Repeated analyses of the two candidates by fsLA-MC-ICP-MS yielded a good external reproducibility of <0.10% (2SD) for δ124Sn/120Sn, validating their suitability as matrix-matched reference materials for in situ Sn isotope analysis of cassiterite and bronze. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:This study investigated matrix effects during in situ Sn isotope analysis using a femtosecond (fs) laser ablation system coupled to a multi-collector ICP-MS. Contrary to the common perception of "matrix-free" analysis, matrix effects are evident during in situ analysis. The measured δ124Sn/120Sn ratios of cassiterite and bronze deviated from the true values by up to 0.7‰ and 0.5‰, respectively, when using a pure tin metal as the bracketing standard. Introducing water vapour into the carrier gas substantially reduced these matrix effects, though minor deviations, from −0.24‰ to −0.33‰, persisted for cassiterite and bronze when tin metal was used as a non-matrix-matched calibration under wet plasma conditions, indicating that ablation-related processes also contribute to matrix effects. Therefore, matrix-matched reference materials are required for high-precision and accurate Sn isotope analyses of cassiterite and bronze samples. We evaluated four candidate samples, NWU-CAS (a natural cassiterite), NWU-Sn (tin metal plate), GBW02140 and GBW02137 (two certified bronze reference materials from the National Research Center for Certified Reference Material of China). Repeated analyses of the two candidates by fsLA-MC-ICP-MS yielded a good external reproducibility of <0.10% (2SD) for δ124Sn/120Sn, validating their suitability as matrix-matched reference materials for in situ Sn isotope analysis of cassiterite and bronze. [ABSTRACT FROM AUTHOR]
ISSN:02679477
DOI:10.1039/d6ja00080k