Abstract
Some 20% of the cadmium, 60% of the lead and 70% of the copper dissolved in the Baltic Sea occur in the form of organic complexes, as revealed by differential pulse anodic stripping voltammetry (DPASV) analyses. Complexing capacities in the ranges 0.8–1.7 µg/l (Pb), 1.4–3.2 µg/l (Cu), and 0.3 µg/l (Cd) were also found. Complexing capacities of humic substances account for 70–90% of those of sea water, indicating that these substances are responsible for the major part of the complexing properties of the Baltic water. Aqueous solutions of humic substances exhibit decreasing complexing capacities with increasing salinity. This suggests major changes in proportion of dissolved species in the mixing zone of fresh and saline water. Some 60% of the complexed lead and 40% of the complexed copper were released from organic complexes in water from the Vistula River when salinity was increased in laboratory experiments.
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© 1991 Springer-Verlag
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Pempkowiak, J. (1991). Complexing properties of humic substances isolated from sea water; the contribution of these substances to complexing capacities of water from the Baltic Sea and geochemical implications of this phenomenon. In: Allard, B., Borén, H., Grimvall, A. (eds) Humic Substances in the Aquatic and Terrestrial Environment. Lecture Notes in Earth Sciences, vol 33. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0010485
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DOI: https://doi.org/10.1007/BFb0010485
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