This reference material was prepared by Qi et al. [1] from commercially available L-glutamic acids which were dissolved in water and mixed with small amounts of L-glutamic acids isotopically enriched in δ13C or in δ15N. The solution was dried again and packaged. Its recommended δ13C value was determined in an international calibration [2].
| Analyte | Value | Unit | SD | R/I/C |
|---|
| δ13C | +37.626 | ‰VPDB | 0.049 | C |
| δ15N | +47.6 | ‰air N2 | 0.2 | R |
(R/I/C) Classification assigned to the property value for analyte (Recommended/Information/Certified)
References:
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.
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.
