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Dissolved trace metals and organic matter distribution in the northern Adriatic, an increasingly oligotrophic shallow sea

Penezić, Abra; Gašparović, Blaženka; Cuculić, Vlado; Strmečki, Slađana; Djakovac, Tamara; Mlakar, Marina (2022) Dissolved trace metals and organic matter distribution in the northern Adriatic, an increasingly oligotrophic shallow sea. Water, 14 . ISSN 2073-4441

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We report a monthly distribution of Zn, Cd, Pb, Cu, Ni and Co, biologically relevant trace metals (TMs), within one year, in the productive surface layer at two stations with different trophic characters in the northern Adriatic (NA). The TM data was accompanied by a multivariable dataset, including dissolved organic carbon (DOC), surface- active organic substances (SAS), nitrogen containing polymeric organic material (N-POM), nutrients, pH, dissolved O2 , chlorophyll a (Chl a), seawater temperature, and the Po River discharge rate. At the eu- to mesotrophic station 108, the concentrations of dissolved TMs were 5– 116 nM for Zn, 0.04–0.18 nM for Cd, 0.05–0.63 nM for Pb, 3–17 nM for Cu, 4–11 nM for Ni, and 0.2– 1.2 nM for Co, while at the oligotrophic station 107, they were 6–224 nM for Zn, 0.03–0.16 nM for Cd, 0.05–1.25 nM for Pb, 3–17 nM for Cu, 4–19 nM for Ni, and 0.1–0.7 nM for Co. The characterization of organic matter (OM) in conjunction with the analysis of correlations with TMs indicated that the OM–TMs interactions differed between the two stations ; namely, the freshly produced OM detected at station 108 was probably involved in the complexation of Cu, Co, Cd, and Ni, whereas at station 107, such complexation processes were not present. Accumulation of DOC was observed during the summer months at both stations. Our results present a significant contribution to biogeochemical studies in the NA by focusing on the complexity of TM–OM interactions, which is a prerequisite for interpretation of their responses to local and global changes.

Item Type: Article
Uncontrolled Keywords: trace metals ; organic matter ; surface-active substances ; micronutrients ; Mediterranean Sea ; the northern Adriatic
Subjects: NATURAL SCIENCES > Interdisciplinary Natural Sciences
NATURAL SCIENCES > Interdisciplinary Natural Sciences > Marine Science
Divisions: Division for Marine and Enviromental Research
Project titleProject leaderProject codeProject type
Utjecaj okolišnog stresa na pojavnost i međudjelovanje biološki važnih organskih molekula i mikronutrijenata u morskom ekosustavuGašparović, BlaženkaIP-2013-11-8607HRZZ
Depositing User: Blaženka Gašparović
Date Deposited: 17 Feb 2022 14:38
DOI: 10.3390/w14030349

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