Significance of groundwater discharge along the coast of Poland as a source of dissolved metals to the southern Baltic Sea
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KeywordSubmarine groundwater discharge (SGD); Speciation; Trace metal fluxes; Geochemistry; Bay of Puck
Fluxes of dissolved trace metals (Cd, Co, Cr, Cu, Mn, Ni, Pb, and Zn) via groundwater discharge along the southern Baltic Sea have been assessed for the first time. Dissolved metal concentrations in groundwater samples were less variable than in seawater and were generally one or two orders of magnitude higher: Cd (2.1-2.8 nmolL−1), Co (8.70-8.76 nmolL−1), Cr (18.1-18.5 nmolL−1), Mn (2.4-2.8 μmolL−1), Pb (1.2-1.5 nmolL−1), Zn (33.1-34.0 nmolL−1). Concentrations of Cu (0.5-0.8 nmolL−1) and Ni (4.9-5.8 nmolL−1) were, respectively, 32 and 4 times lower, than in seawater. Groundwater-derived trace metal fluxes constitute 93% for Cd, 80% for Co, 91% for Cr, 6% for Cu, 66% for Mn, 4% for Ni, 70% for Pb and 93% for Zn of the total freshwater trace metal flux to the Bay of Puck. Groundwater-seawater mixing, redox conditions and Mn-cycling are the main processes responsible for trace metal distribution in groundwater discharge sites.
© The Author(s), 2016. This is the author's version of the work and is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Marine Pollution Bulletin 109 (2016): 151–162, doi:10.1016/j.marpolbul.2016.06.008.
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