Abstract
Humic substances were isolated from water of the Baltic Sea and the Vistula River by means of sorption on Amberlite XAD-2 resin, and from sea sediments, river sediments and soil by means of alkaline extraction. The following properties of obtained substances were measured: elemental composition, absorption spectra (UV, VIS, IR), molecular weight distribution the content of aromatic aldehydes after nitrobenzene oxidation, and 13C/ 12C ratio. The humic substances isolated from the Vistula water exhibited similar elemental composition and absorption spectra to the humic substances from seawater, but a larger amount of high molecular weight material and lower values for 13C/ 12C. Sediments and soil from both generally exhibited similar properties. However, they differed substantially in their molecular weight distribution, absorption spectra and elemental composition from dissolved humic substances, but their 13C/ 12C ratio and the content of aromatic aldehydes appeared to be in the same range. On the basis of the above mentioned properties it was evaluated that in the Baltic Sea, which is an example of a land-locked sea with low exchange of water with an ocean and high river runoff, humic substances of land origin comprise a great proportion of humic substances both from seawater and sea sediments.
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