USGS24

€150.00
Producing Laboratory: TERC
Availability: In stock
Graphite

​USGS24 was prepared by T. B. Coplen, U.S. Geological Survey, from Baker® technical grade graphite (96 percent smaller than 44 µm)[1]. Prior to splitting with a sample splitter, six spatially separated ~ 1 mg samples were analyzed to verify the isotopic homogeneity of the material. The range of variation of values was 0.11‰. The carbon stable isotopic composition was re-evaluated in an interlaboratory calibration[2].

AnalyteValueUnitSDR/I/C
δ13C-16.05VPDB0.04C

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

    1. GONFIANTINI, R., STICHLER, W., ROZANSKI, K., Standards and intercomparison materials distributed by the International Atomic Energy Agency for stable isotope measurements. IAEA-TECDOC-825. International Atomic Energy Agency, Vienna, Austria (1995) 13-29.

    2. COPLEN, T.B., BRAND, W.A., GEHRE, M., GRÖNING, M., MEIJER, H.A.J., TOMAN, B., VERKOUTEREN, R.M., New guidelines for δ13C measurements, Anal. Chem. 78 (2006) 2439-2441.

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