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  Two new organic reference materials for δ13C and δ15N measurements and a new value for the δ13C of NBS 22 oil

Qi, H. P., Coplen, T. B., Geilmann, H., Brand, W. A., & Böhlke, J. K. (2003). Two new organic reference materials for δ13C and δ15N measurements and a new value for the δ13C of NBS 22 oil. Rapid Communications in Mass Spectrometry, 17(22), 2483-2487.

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 Urheber:
Qi, H. P., Autor
Coplen, T. B., Autor
Geilmann, H.1, Autor           
Brand, W. A.1, Autor           
Böhlke, J. K., Autor
Affiliations:
1Service Facility Stable Isotope/Gas Analytics, Dr. W. A. Brand, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497772              

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Schlagwörter: Cross-contamination; carbon-dioxide
 Zusammenfassung: Analytical grade L-glutamic acid is chemically stable and has a C/N mole ratio of 5, which is close to that of many of natural biological materials, such as blood and animal tissue. Two L-glutamic acid reference materials with substantially different C-13 and N-15 abundances have been prepared for use as organic reference materials for C and N isotopic measurements. USGS40 is analytical grade L-glutamic acid and has a delta(13)C value of -26.24parts per thousand relative to VPDB and a delta(15)N value of -4.52parts per thousand relative to N-2 in air. USGS41 was prepared by dissolving analytical grade L-glutamic acid with L-glutamic acid enriched in C-13 and N-15. USGS41 has a delta(13)C value of +37.76parts per thousand and a delta(15)N value of +47.57parts per thousand. The delta(13)C and delta(15)N values of both materials were measured against the international reference materials NBS 19 calcium carbonate (delta(13)C = +1.95parts per thousand), L-SVEC lithium carbonate (delta(13)C = -46.48parts per thousand), IAEA-N-1 ammonium sulfate (delta(15)N = 0.43parts per thousand), and USGS32 potassium nitrate (delta(15)N = 180parts per thousand) by on-line combustion continuous-flow and off-line dual-inlet isotope-ratio mass spectrometry. Both USGS40 and USGS41 are isotopically homogeneous; reproducibility of delta(13)C is better than 0.13parts per thousand, and that of delta(15)N is better than 0.13parts per thousand in 100-mug amounts. These two isotopic reference materials can be used for (i) calibrating local laboratory reference materials, and (ii) quantifying drift with time, mass-dependent fractionations, and isotope-ratio-scale contraction in the isotopic analysis of various biological materials. Isotopic results presented in this paper yield a delta(13)C value for NBS 22 oil of -29.91parts per thousand, in contrast to the commonly accepted value of -29.78parts per thousand for which off-line blank corrections probably have not been quantified satisfactorily. Published in 2003 by John Wiley Sons, Ltd.

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 Datum: 2003
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Titel: Rapid Communications in Mass Spectrometry
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: New York, NY : John Wiley & Sons
Seiten: - Band / Heft: 17 (22) Artikelnummer: - Start- / Endseite: 2483 - 2487 Identifikator: CoNE: https://pure.mpg.de/cone/journals/resource/954925574961
ISSN: 0951-4198