Article Dans Une Revue Agronomie Année : 2000

Structural characterization of humic substances from an acidic peat using thermochemolysis techniques

Résumé

The general aim of the present work is a study of the insoluble organic matter (humic acids, humin) present in an acidic wetland, and more particularly lipidic parts involved in their chemical structure. Humic acids and humin from an acidic peat bog located at Brennilis (Sphagnum, pH 4.7) in Brittany (France) were characterised by spectroscopic properties (FT-IR and solid state 13C NMR) of their functional groups. Analytical and preparative thermochemolysis (pyrolysis using tetraalkylammonium hydroxide) were also used to investigate humic substances. This technique yielded various ranges of hydrocarbons, fatty acid methyl esters and a,w-dicarboxylic acid methyl esters. In both cases, pyrolysates contained high amounts of polar macromolecular components and aromatic products, mainly derived from lignin moieties, as syringic and p-coumaric units. Our results indicate that structural similarities exist between humic acids and humin in the Brennilis sample, but important structural differences can be pointed out by thermochemolysis.

Fichier non déposé

Dates et versions

hal-00150855 , version 1 (31-05-2007)

Identifiants

Citer

Cédric Guignard, Laurent Lemée, André Amblès. Structural characterization of humic substances from an acidic peat using thermochemolysis techniques. Agronomie, 2000, 20, pp.465-475. ⟨10.1051/agro:2000142⟩. ⟨hal-00150855⟩

Collections

76 Consultations
0 Téléchargements

Altmetric

Partager

  • More