Stability and carbon isotope changes of soot and char materials during thermal oxidation: Implication for quantification and source appointment

摘要: Abstract The thermal-oxidative resistances of seven soot and char samples from various combustion processes were tested with a chemothermal oxidation (CTO) method. residues each soot/char oxidized at different temperature conditions quantified for the remaining organic carbon contents their stable isotope compositions. results showed that had distinctly resistance to CTO, half-temperature values 380–409 °C diesel- hexane-derived soots, 276–312 °C biomass- coal-derived 257–323 °C other two chars. lower thermal biomass soots coal suggested they likely formed temperatures cannot be detected or in environmental using standard CTO-375 data three modes δ 13 C shifts as increased. Both diesel hexane no change during CTO treatment. shifted more negative whereas four biomass-derived became positive. interpretation residual BC materials after treatment should cautious.