Abstract
δ 13 C values in non-irradiated natural graphite were measured. The measurements were carried out using an elemental analyzer combined with stable isotope ratio mass spectrometer (EA-IRMS). The samples were prepared with ground and non-ground graphite, the part of which was mixed with Mg (ClO 4 ) 2 . The best combustion of graphite in the oxidation furnace of the elemental analyzer was achieved when the amount of pulverized graphite ranged from 200 to 490 µg and the mass ratio C:Mg(ClO 4 ) 2 was approximately 1:10. The method for the graphite burning avoiding the isotope fractionation is proposed. DOI: http://dx.doi.org/10.5755/j01.ms.21.2.6873
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