Calibration strategies for the determination of stable carbon absolute isotope ratios in a glycine candidate reference material by elemental analyser-isotope ratio mass spectrometry

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• 作者：Philip J. H. Dunn ; Dmitry Malinovsky…
• 关键词：Absolute isotope ratio ; VPDB ; EA ; IRMS ; δ 13C ; Synthetic isotopic mixtures
• 刊名：Analytical and Bioanalytical Chemistry
• 出版年：2015
• 出版时间：April 2015
• 年：2015
• 卷：407
• 期：11
• 页码：3169-3180
• 全文大小：716 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Analytical Chemistry
  Food Science
  Inorganic Chemistry
  Physical Chemistry
  Monitoring, Environmental Analysis and Environmental Ecotoxicology
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1618-2650

文摘

We report a methodology for the determination of the stable carbon absolute isotope ratio of a glycine candidate reference material with natural carbon isotopic composition using EA-IRMS. For the first time, stable carbon absolute isotope ratios have been reported using continuous flow rather than dual inlet isotope ratio mass spectrometry. Also for the first time, a calibration strategy based on the use of synthetic mixtures gravimetrically prepared from well characterised, highly 13C-enriched and 13C-depleted glycines was developed for EA-IRMS calibration and generation of absolute carbon isotope ratio values traceable to the SI through calibration standards of known purity. A second calibration strategy based on converting the more typically determined delta values on the Vienna PeeDee Belemnite (VPDB) scale using literature values for the absolute carbon isotope ratio of VPDB itself was used for comparison. Both calibration approaches provided results consistent with those previously reported for the same natural glycine using MC-ICP-MS; absolute carbon ratios of 10,649?×-0? with an expanded uncertainty (k--) of 24?×-0? and 10,646?×-0? with an expanded uncertainty (k--) of 88?×-0? were obtained, respectively. The absolute carbon isotope ratio of the VPDB standard was found to be 11,115?×-0? with an expanded uncertainty (k--) of 27?×-0?, which is in excellent agreement with previously published values. Figure ?/em>