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Effects of charring on mass, organic carbon, and stable carbon isotope composition of wood

  • Author(s): Czimczik, Claudia I
  • Preston, Caroline M
  • Schmidt, Michael WI
  • Werner, Roland A
  • Schulze, Ernst-Detlef
  • et al.
Abstract

To aid in understanding black carbon (BC) formation during smoldering combustion in forest fires, we characterized charring of a softwood and hardwood. Charring (150, 340, 480°C) caused mass loss (7-84%), enrichment of organic carbon (OC) (0-32%), and 13C depletion (> 150°C). As determined by 13C MAS NMR, the OC composition of the woods was dominated by (di)-O-alkyl structures, and the chars by alkyl and aromatic structures. With increasing temperature, aromatic structures increased and the chars became more similar, although initial differences in OC concentration and δ 13C of woods persisted. The BC cluster sizes apparently remained small, pointing towards a low resistance against oxidation. Crown Copyright © 2002 Published by Elsevier Science Ltd. All rights reserved.

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