Fractionation of alkali-soluble peat organic matter with the application of XAD-8 and XAD-4 resins used in tandem

摘要

With the application of the tandem XAD-8/XAD-4 resin method,alkali-soluble peat organic matter was fractionated on 5 fractions of humic and non-humic character.Humic acids (HA) were shown to be characterised by the highest proportion of aromatic and alkyl carbon and the most developed systems of polyconjugation.Fulvic acids (FA) isolated by adsorption on XAD-8 resin were found to contain much less amounts of carbohydrates,a higher portion of aromatic and carboxyl carbon and more developed polyconjugation systems in comparison to FA isolated as barium fulvate.Hydrophilic or XAD-4 acids cannot be assigned to humic substances.