Properties of organic matter and molecular size distribution of humic acids isolated from forest soil
2005
Debska, B.(University of Technology and Agriculture, Bydgoszcz (Poland). Dept. of Environmental Chemistry) | Drag, M.(University of Technology and Agriculture, Bydgoszcz (Poland). Dept. of Environmental Chemistry) | Andersen, D.O.(Agder Univ. College, Kristiansand (Norway). Faculty of Mathematics and Sciences)
The aim of the present paper was to characterize the properties of humic substances of forest soils, especially the properties of humic acids. The research involved samples from the organic and humic horizon of forest soil taken from the monocultures of European silver fir (Abies alba) and European beech (Fagus sylvatica). The humic acids were characterized by their elemental composition, spectrometric properties for the UV-VIS and IR ranges as well as HPSEC. It was shown that the highest content of carbon, oxygen and the lowest of hydrogen as well as the lowest values of coefficients of A2/6, A4/6 and deltalogK was obtained for humic acids isolated from deeper layers of the humic horizon, irrespective of the species of the forest stand. Based on the HPSEC analysis, it was noted that the process of humification of the materials of the duffs analyzed was connected with an increase in the polydispersity of humic acids molecules.
显示更多 [+] 显示较少 [-]