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Article

Trace Metal Partitioning in the Salinity Gradient of the Highly Stratified Estuary: A Case Study in the Krka River Estuary (Croatia)

Center for Marine and Environmental Research, Ruđer Bošković Institute, 10000 Zagreb, Croatia
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Academic Editors: Franz Saija, Ottavia Giuffrè, Giuseppe Cassone and Claudia Foti
Appl. Sci. 2022, 12(12), 5816; https://doi.org/10.3390/app12125816
Received: 25 May 2022 / Revised: 3 June 2022 / Accepted: 6 June 2022 / Published: 8 June 2022
A size partitioning of several trace metals (Zn, Cd, Pb, Cu, Ni, Co, Mn, Fe and Al) between five size fractions (<3 kDa, 3 kDa–0.1 µm, 0.1 µm–1.2 µm, 1.2 µm–5 µm and >5 µm) was studied in the vertical salinity gradient of the highly stratified Krka River estuary. The results indicated a dominant river source for Zn, Co, Mn, Fe and Al and a diluting effect on Cd, Pb and Ni. The truly dissolved fraction (<3 kDa) dominated the Zn, Cd, Cu, Ni and Co pool, and a large part of Pb, Mn, Fe and Al was present in >5 µm particles. Pb, Mn, Fe and Al were closely related, showing a precipitation and colloidal aggregation in the surface layers and dissolution in the seawater layer. The highest percentage (30–37%) of colloids (3 kDa–0.1 µm) in the dissolved pool was found for Pb, Cu, Fe and Al. Differences in size distribution between low and high river flow periods revealed that Zn, Pb, Co, Mn, Fe and Al are introduced by the river mostly in the 3 kDa–5 µm size range. Therefore, a low percentage of colloidally bound metals compared to other coastal areas can be explained by a limited riverine input of terrigenous material, characteristic for this estuary. Correlation with PARAFAC components revealed associations of Cu with protein-like substances and Co with humic-like substances. The accumulation of Cu at the freshwater-seawater interface coupled with an increase of its colloidal fraction was observed, apparently governed by biologically produced organic ligands. View Full-Text
Keywords: trace metals; fractionation; colloids; truly dissolved; estuary trace metals; fractionation; colloids; truly dissolved; estuary
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MDPI and ACS Style

Marcinek, S.; Cindrić, A.M.; Pađan, J.; Omanović, D. Trace Metal Partitioning in the Salinity Gradient of the Highly Stratified Estuary: A Case Study in the Krka River Estuary (Croatia). Appl. Sci. 2022, 12, 5816. https://doi.org/10.3390/app12125816

AMA Style

Marcinek S, Cindrić AM, Pađan J, Omanović D. Trace Metal Partitioning in the Salinity Gradient of the Highly Stratified Estuary: A Case Study in the Krka River Estuary (Croatia). Applied Sciences. 2022; 12(12):5816. https://doi.org/10.3390/app12125816

Chicago/Turabian Style

Marcinek, Saša, Ana Marija Cindrić, Jasmin Pađan, and Dario Omanović. 2022. "Trace Metal Partitioning in the Salinity Gradient of the Highly Stratified Estuary: A Case Study in the Krka River Estuary (Croatia)" Applied Sciences 12, no. 12: 5816. https://doi.org/10.3390/app12125816

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