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- W2896376585 abstract "Rationale Acid digestion of carbonates to release CO 2 is a crucial and sensitive step in sample preparation for clumped isotope analysis. In addition to data reduction and instrumental artefacts, many other uncertainties in the clumped isotope analysis of carbonates arise from the method used for the preparation of CO 2 . We describe here an in‐house‐designed reaction vessel that circumvents degassing and contamination problems commonly associated with the McCrea‐type digestion protocols. Methods We designed a leak‐free break seal reaction vessel (made of Pyrex™) suitable for prolonged acid digestion at 25°C. Using this new vessel, several carbonate reference materials widely used in the clumped isotope community and other in‐house laboratory standards were acid‐digested and analysed for their δ 13 C, δ 18 O and Δ 47 values with a dual inlet MAT 253 isotope ratio mass spectrometer following standard gas chromatography purification and data evaluation protocols. Results Long‐term reproducibility in Δ 47 determination was established using international references and in‐house working standards as follows (mean and SE): Carrara‐1 (0.395 ± 0.002‰, n = 43), Carrara‐2 (0.441 ± 0.003‰, n = 22), OMC (0.587 ± 0.004‰, n = 16), NBS 19 (0.393 ± 0.005‰, n = 10), NBS 18 (0.473 ± 0.003‰, n = 5), ETH 1 (0.271 ± 0.005‰, n = 7), ETH 3 (0.698 ± 0.005‰, n = 3), MZ (0.715 ± 0.002‰, n = 3) and several others. Conclusions A new method using a break seal tube was found to be efficient for the clumped isotope analysis of carbonates that require longer reaction time at 25°C. This method yields good precision in Δ 47 analysis and was found to be suitable for acid digestions at any desired temperature." @default.
- W2896376585 created "2018-10-26" @default.
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- W2896376585 date "2018-12-19" @default.
- W2896376585 modified "2023-10-16" @default.
- W2896376585 title "Acid digestion of carbonates using break seal method for clumped isotope analysis" @default.
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- W2896376585 doi "https://doi.org/10.1002/rcm.8304" @default.
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