AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
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STUDIA GEOLOGIA - Ediţia nr.1 din 2007 | |||||||
Articol: |
A NEW EVALUATION OF THE OXYGEN CORRECTION ALGORITHM FOR CARBON AND OXYGEN ISOTOPE AMOUNT MEASUREMENTS ON CO2 GAS. Autori: MIHAI VARLAM, STAF VALKIERS. |
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Rezumat: Carbon isotope amount measurements are intrinsically related to the oxygen isotopic composition, as most mass spectrometric measurements are made on CO2 gas at mass-to-charge 44 to 46. The large number of isotopomers however is making the calculation of carbon or oxygen isotope abundance rather tricky. Oxygen has three stable isotopes, of which two are rare both with natural abundance of only ~0.037 and ~0.2 amount %, for respectively 17O and 18O. The variations around these abundances are dependent of fractionation processes in nature. It is therefore rather difficult to achieve the oxygen isotope abundances only by theoretical calculations or assumptions, even if the sample history is well known. To trace back past events however, values for the oxygen isotope abundances could help. | |||||||