NBS 22 , Oil

Materials with known 2H, 13C,15N and 18O isotopic composition

NBS 22 mineral oil was prepared by S. Silverman, Chevron Oil Company, La Habra, California [1]. The material served for several decades as reference material for organic carbon bearing substances. The carbon isotopic composition of this material was re-assessed with changes in recommended δ13C value and improvement in its value uncertainty [2,3].

Analyte Value Unit SD R/I/C
δ13C -30.031 VPDB 0.043 C
δ2H -120 VSMOW 1 C

(R/I/C) Classification assigned to the property value for analyte (Recommended/Information/Certified)


  1. SILVERMAN, S.R., "Investigations of petroleum origin and evolution mechanisms by carbon isotope studies", Isotopic and Cosmic Chemistry (CRAIG, H., MILLER, S.L., WASSERBURG, G.J., Eds.), North Holland, (1964) 92-102.

  2. QI, H., COPLEN, T.B., GEILMANN, H., BRAND, W.A., BÖHLKE, J.K., Two new organic reference materials for δ13C and δ15N measurements and a new value for the δ13C of NBS 22 oil, Rapid Commun. Mass Spectrom. 17 (2004) 2483-2487.

  3. COPLEN, T.B., BRAND, W.A., GEHRE, M., GRÖNING M., MEIJER, H.A.J., TOMAN, B., VERKOUTEREN, R.M., New Guidelines for 13C Measurements, Anal. Chem. 78 7 (2006) 2439-2441.


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