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- W2803462624 abstract "Abstract This study presents a method for high-precision stable potassium (K) isotope analysis using High-Resolution Multi-Collector Inductively Coupled Plasma Mass Spectrometry (HR-MC-ICPMS). Dry and cold plasma is used to suppress the formation of argon hydrides that are direct isobaric interferences on K isotopes. The residual 40Ar1H+ beam is resolved from 41K+ by using pseudo-high resolution mode, providing interference-free shoulders of 39K+ and 41K+ for isotopic measurements. Precision of better than 0.06‰ (95% confidence interval) has been routinely achieved based on multiple measurements of pure K standard solutions and rock standards over a six-month period. Mismatches in K concentration (up to 20%) and acid molarity (up to 67%) between samples and bracketing standards, as well as the presence of substantial amount of matrix element Rb, do not significantly affect the analytical precision and accuracy. Our study documents that high-precision K isotope analysis can be routinely achieved for a wide variety of natural samples by HR-MC-ICPMS, which makes it possible for using K isotopes to trace major geological processes." @default.
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- W2803462624 date "2018-08-01" @default.
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- W2803462624 title "High-precision analysis of potassium isotopes by HR-MC-ICPMS" @default.
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- W2803462624 doi "https://doi.org/10.1016/j.chemgeo.2018.05.033" @default.
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