Comparison of the structures of humic acids from marine sediments and degraded field diatoms by 13C- and 1H-NMR spectroscopy |
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| Authors: | E-L Poutanen RJ Morris |
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| Institution: | Institute of Marine Research, P.O. Box 33, SF-00931 Helsinki Finland;Institute of Oceanographic Sciences, Wormley, Godalming, Surrey Gt. Britain |
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| Abstract: | Humic acids isolated from marine sediments of the Peru continental shelf and from a degraded field diatom population dominated by the diatoms Skeletonema costatum, Nitzschia seviata and Thalassiosira sp. were characterized on the basis of infrared spectra and 13C- and proton-NMR spectra. Aliphatic structures were found to constitute the major fraction of humic acids and they appear to be highly branched. Carbohydrates and to a lesser extent aromatic materials, carbonyl-, ether-, alcohol- and amino groups are important contributors to the structure of marine humic acids. A close relationship was observed between the chemical structure of the sedimentary humic acid and the plankton humic acid. |
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