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A new conceptual model for the structural properties of char produced during vegetation fires

AuthorsKnicker, Heike ; Hilscher, André; González-Vila, Francisco Javier ; Almendros Martín, Gonzalo
Issue Date2008
CitationOrganic Geochemistry 39(8): 935-939 (2008)
AbstractThe elemental and 13C nuclear magnetic resonance (NMR) analysis of laboratory prepared char samples from the main plant biopolymers (cellulose, lignin, casein), as well as grass and beech sawdust, indicated a greater chemical heterogeneity of plant derived chars than generally assumed from common black carbon (BC) models. The data support a recent concept proposing char as a heterogeneous mixture of thermally altered biomacromolecules with N, O and likely also S substitutions as common features. In contrast to soot, graphitic polyaromatic domains play a minor role in such chars. The high resistance of casein against thermal treatment and the low atomic N/C values for grass chars demonstrate the quantitative importance of pyrogenic N. A more detailed consideration is needed if a more realistic view of the role of pyrogenic organic matter (PyOM) in soils and sediments is required.
Description5 páginas, 1 figuras, 2 tablas, 14 referencias.-- Enlazamos con el ítem: http://hdl.handle.net/10261/55320 .-- cmartin@irnase.csic.es
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