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Characterization of aromatic structures in humic and fulvic acids
AbstractThe degradation technique, originally applied to the study of aromatic units in lignin, was used to characterize the aromatic structures present in humic and fulvic acids. The method includes two oxidation steps, one with potassium permanganate and the other with hydrogen peroxide. The phenolic hydroxyls are protected by ethylation before oxidation. Metylation of the formed acids enables gas chromatographic/mass spectrometric analysis. Humic acids gave more aromatic degradation units than fulvic acids, but the same aromatic structures were observed in both humic and fulvic acids. More phenolic than nonphenolic units were found. The main phenolic degradation product was p-ethoxybenzoic acid, both in humic and fulvic acids. The results are also discussed in relation to the formation of the strong mutagen Z-2-chloro-3-dichloromethyl-4-oxobutenoic acid, MX, by aqueous chloronation of humic and fulvic acids.
Characterization of aromatic structures in humic and fulvic acids
AbstractThe degradation technique, originally applied to the study of aromatic units in lignin, was used to characterize the aromatic structures present in humic and fulvic acids. The method includes two oxidation steps, one with potassium permanganate and the other with hydrogen peroxide. The phenolic hydroxyls are protected by ethylation before oxidation. Metylation of the formed acids enables gas chromatographic/mass spectrometric analysis. Humic acids gave more aromatic degradation units than fulvic acids, but the same aromatic structures were observed in both humic and fulvic acids. More phenolic than nonphenolic units were found. The main phenolic degradation product was p-ethoxybenzoic acid, both in humic and fulvic acids. The results are also discussed in relation to the formation of the strong mutagen Z-2-chloro-3-dichloromethyl-4-oxobutenoic acid, MX, by aqueous chloronation of humic and fulvic acids.
Characterization of aromatic structures in humic and fulvic acids
Långvik, Vivi-Ann (author) / Åkerback, Nina (author) / Holmbom, Bjarne (author)
Environmental International ; 20 ; 61-65
1993-11-30
5 pages
Article (Journal)
Electronic Resource
English
Characterization of aromatic structures in humic and fulvic acids
| Online Contents | 1994
Chlorination and Coagulation of Humic and Fulvic Acids
| Wiley | 1979