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

Authors:Knicker, Heike
Hilscher, André
González-Vila, Francisco Javier
Almendros Martín, Gonzalo
Issue Date:2008
Citation:Organic Geochemistry 39(8): 935-939 (2008)
Abstract:The 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.
Description:5 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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