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• W2081993348 abstract "Three Si isotope materials have been used for an inter-laboratory comparison exercise to ensure reproducibility between international laboratories investigating natural Si isotope variations using a variety of chemical preparation methods and mass spectrometric techniques. These proposed standard reference materials are (i) IRMM-018 (a SiO2 standard), (ii) Big-Batch (a fractionated SiO2 material prepared at the University of California Santa Barbara), and (iii) Diatomite (a natural diatomite sample originally deposited as marine biogenic opal). All analyses are compared with the international Si standard NBS28 (RM8546) and are in reasonable agreement (<±0.22‰ 1σSDδ30Si) given the different measurement techniques involved. These methods include both acid and alkaline dissolution/fusion, Si separation using cation exchange, selective co-precipitation, and gas-source versus plasma-ionization (high and low resolution) mass-spectrometric techniques. The average δ30Si for Diatomite, IRMM-018, and Big-Batch are +1.26‰, −1.65‰ and −10.48‰, respectively, with corresponding δ29Si values of +0.64‰, −0.85‰ and −5.35‰ for the same standards, respectively. For the most fractionated standard (Big-Batch), results demonstrate a kinetic mass-dependent fractionation effect for atomic Si (i.e., δ29Si ∼ 0.51 × δ30Si). There is almost no statistical difference between the mean values obtained by each participating laboratory, with the notable exception of the IRMM-018 standard. This effect could be caused by heterogeneity or contamination of this standard. The results for the other two standards indicate that data sets produced using any of the methods employed in this study will have similar precision and differences are limited to 0.2‰ in mean δ30Si values for a given sample between laboratories, or differences of 0.13‰ in mean δ29Si values." @default.
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• W2081993348 date "2007-01-01" @default.
• W2081993348 modified "2023-10-14" @default.
• W2081993348 title "An inter-laboratory comparison of Si isotope reference materials" @default.
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• W2081993348 doi "https://doi.org/10.1039/b616755a" @default.
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