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• W2149221631 abstract "Although the advantages of online δ18O analysis of organic compounds make its broad application desirable, researchers have encountered NO+ isobaric interference with CO+ at m/z 30 (e.g. 14N16O+, 12C18O+) when analyzing nitrogenous substrates. If the δ18O value of inter-laboratory standards for substrates with high N:O value could be confirmed offline, these materials could be analyzed periodically and used to evaluate δ18O data produced online for nitrogenous unknowns. To this end, we present an offline method based on modifications of the methods of Schimmelmann and Deniro (Anal. Chem. 1985; 57: 2644) and Sauer and Sternberg (Anal. Chem. 1994; 66: 2409), whereby all the N2 from the gas products of a chlorinated pyrolysis was eliminated, resulting in purified CO2 for analysis via a dual-inlet isotope ratio mass spectrometry system. We evaluated our method by comparing observed δ18O values with previously published or inter-laboratory calibrated δ18O values for five nitrogen-free working reference materials; finding isotopic agreement to within ±0.2‰ for SIGMA® cellulose, IAEA-CH3 cellulose (C6H10O5) and IAEA-CH6 sucrose (C12H22O11), and within ±1.8‰ for IAEA-601 and IAEA-602 benzoic acids (C7H6O2). We also compared the δ18O values of IAEA-CH3 cellulose and IAEA-CH6 sucrose that was nitrogen-'doped' with adenine (C5H5N5), imidazole (C3H4N2) and 2-aminopyrimidine (C4H5N3) with the undoped δ18O values for the same substrates; yielding isotopic agreement to within ±0.7‰. Finally, we provide an independent analysis of the δ18O value of IAEA-600 caffeine (C8H10N4O2), previously characterized using online systems exclusively, and discuss the reasons for an average 1.4‰ enrichment in δ18O observed offline relative to the consensus online δ18O value. Copyright © 2010 John Wiley & Sons, Ltd." @default.
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• W2149221631 date "2010-10-06" @default.
• W2149221631 modified "2023-10-16" @default.
• W2149221631 title "Offline oxygen isotope analysis of organic compounds with high N:O" @default.
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• W2149221631 doi "https://doi.org/10.1002/rcm.4752" @default.
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