Iron isotope systematics during igneous differentiation in lavas from Kīlauea and Mauna Loa, Hawai'i

Ruttor, Saskia; Nebel, Oliver; Nebel-Jacobsen, Yona; Norman, Marc D.; Kendrick, Mark A.; Rogers, Angus; Mather, Ben

doi:10.1016/j.chemgeo.2022.120973

Cited by 3 publications

(2 citation statements)

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“…The shorter the bracket (i.e., fewer samples measured between two isotope standards), the smaller the predicted instrumental drift between measurements of the isotope standards. While some studies (e.g., Millet et al 2012) have combined SSB with double spiking in order to correct for any residual mass bias corrections that double spiking is unable to account for, many laboratories choose to use SSB exclusively (e.g., Dauphas et al 2004, Shahar et al 2008, Dauphas et al 2009b, Albarède et al 2011, Jaouen et al 2013, Shahar et al 2015, Debret et al 2016, Li et al 2016, Chernonozhkin et al 2017, Smith et al 2017, Bilenker et al 2018, Gleeson et al 2020, Ruttor et al 2022. Thus, the intent of this study is to provide additional context for the appropriate use of SSB.…”

Section: Challenges In Fe Isotope Ratio Measurement By Mc-icp-msmentioning

confidence: 99%

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A Systematic Investigation of the Effects of Standard‐Sample Concentration Mismatch during Fe Isotope Measurement by MC‐ICP‐MS

King‐Doonan,

Bilenker,

Weis

et al. 2024

Geostandard Geoanalytic Res

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Advances in multi‐collector inductively coupled plasma‐mass spectrometry (MC‐ICP‐MS) have led to the widespread use of iron (Fe) isotopes to elucidate the (bio)geochemical history of a range of environments. To generate Fe isotope measurements, standard‐sample bracketing (SSB) is commonly used to correct for instrumental mass bias inherent to MC‐ICP‐MS. However, SSB is only accurate when sample and isotope standard Fe concentrations match, in addition to the bulk solution matrix. When the Fe concentrations differ, Fe isotope measurements may be inaccurate, a phenomenon known as the "self‐induced matrix effect." This study systematically characterised the self‐induced matrix effect for dry plasma Fe isotope ratio measurements on three MC‐ICP‐MS instruments and three introduction systems. Our extensive dataset indicates that: (1) the degree of mass bias is consistent regardless of MC‐ICP‐MS front‐end design, (2) the degree of mass bias becomes less reproducible as the concentration difference between the sample and standard increases, and (3) this applies to both pure Fe solutions and solutions from geological materials. This study reinforces the requirement to match standard and sample concentrations within 10% and provides a correction method for that fall beyond the recommended concentration range to subsequently allow for proper concentration matching during SSB.

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