Biodegradation of Natural Organic Matter - Interaction with Metals : Meeting of the International Humic Substances Society. Procceedings

Wroclaw

1997

S. 379-384

1 Abb., 1 Tab., 8 Lit.Ang.

Bandaufführung

9198S

102950

The biodegradability of water extractable and dissolved organic carbon from forest soils was tested in a lab experiment. Natural organic matter was fractionated into hydrophobic and hydrophilic acids and hydrophobic neutral compounds, glucose served as reference system. Cations and solid Al2O3 were added to mimic complexation and adsorption processes. Degradability of natural organic matter fractions ranged from less than 5%, suggesting the exhaustive oxidation of a labile fraction. Metals slowed down the early phase of the degradation process, but had no impact on the cumulative respiration. This effect was inconsistent with the glucose system. Adsorption of natural organic compounds to an oxidic surface greatly decreased the respiration.