A method for the identification and elimination of contamination during carbon isotopic analyses of extraterrestrial samples

Details A method for the identification and elimination of contamination during carbon isotopic analyses of extraterrestrial samples A method for the identification and elimination of contamination during carbon isotopic analyses of extraterrestrial samples

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983metic..18..137s&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 18, June 30, 1983, p. 137-154. Research supported by the Science and Engineering Research Cou

Computer Science

50

Carbon Isotopes, Decontamination, Extraterrestrial Matter, Isotope Separation, Lunar Soil, Meteoritic Composition, Abundance, Apollo 11 Flight, Carbonaceous Chondrites, Combustion Products, Oxidation, Samples, Extraterrestrial, Contamination, Isotopes, Analysis, Procedure, Carbon, Abundance, Techniques, Weathering, Composition

Scientific paper

A stepped combustion method for the elimination of carbon-containing contamination and weathering products from meteorite and lunar samples is presented. Samples of the Allende CV3 chondrite, the Sharps and Weston ordinary chondrite 'falls', one ordinary and five Antarctic 'finds', and lunar soils from Apollo 11 were oxidized in pure O2 at increasing temperatures, from 200 to 1200 C in 100-C, 30-min steps; and C yield and delta-(C-13) were measured after each step. It is found that some C contamination is present in all samples and can adversely affect C-isotopic-abundance measurements. Except for C1 and C2 carbonaceous chondrites, C combustion below 425 + or - 25 C is limited to the terrestrial contaminants, demonstrating the usefulness of stepped combustion in removing them. Graphs and tables of the results are presented and discussed.

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