Studies in seawater and lake water on interactions of trace metals with humic substances isolated from marine and estuarine sediments: I. Characterisation of humic substances |
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| Authors: | B Raspor HW Nürnberg P Valenta M Branica |
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| Institution: | 1. Center for Marine Research Zagreb, ‘Rudjer Bo?kovi?’ Institute, Zagreb, Croatia Yugoslavia;2. Institute of Applied Physical Chemistry, Nuclear Research Center (KFA), Jülich F.R.G. |
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| Abstract: | Two humic acids, HAL and HAN, isolated from marine sediments (Adriatic and Norwegian Sea) and humic (HAM) and fulvic (FAM) acids isolated from an estuarine sediment (Mahakam, Borneo) were characterized.The following characteristics: carbon content, hydrophobicity, degree of condensation and the content of aliphatic groups, are most pronounced for HAN, less pronounced for HAL and the least pronounced for HAM. The abundance of trace metals in the humic acids decreases in the following order: Al > Cu > Zn > Pb > Cd.Fulvic acid (FAM) has a lower carbon and a higher oxygen content than humic acids. It is hydrophilic and hardly any aliphatic groups were recorded. At pH 7 the predominant fraction of FAM has the apparent molecular weight of 20 000 daltons while the humic acids are of higher molecular weight. |
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