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Size-dependent distribution of metal(loid)s in recent marine sediments (Adriatic Sea)

Ivanić, Maja; Mikac, Nevenka; Lučić, Mavro; Durn, Goran; Sondi, Ivan (2023) Size-dependent distribution of metal(loid)s in recent marine sediments (Adriatic Sea). Chemosphere, 345 . ISSN 0045-6535

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This paper investigates occurrence of metal(loid)s, and size-dependent changes in their concentration in recent marine sediments from coastal and open-sea environments in the eastern Adriatic. Size fractionation of sediments was performed after removal of organic matter (OM), and the individual fractions, comprising particles below 8 μm, 4 μm, 2 μm, 1 μm and 0.45 μm, were analysed using HR ICP-MS. The concentrations of most elements increased with decreasing particle size, as a result of accumulation of clay minerals and Fe and Mn (oxyhydr)oxides. A decrease in concentrations was observed for Ba, Sr, Ti and U, due to lowering of the carbonate content and presence in the coarse-grained and heavy mineral fraction. The highest element concentrations were determined in the fraction comprising particles below 1 μm. Occasionally, depending on the sedimentological environment and/or the element in question, the peak concentrations occurred in the fractions <2 μm or <0.45 μm. The lowest size-dependent enrichment was observed for elements associated with aluminosilicates (Al, Be, Cs, Co, Fe, K, Li, Rb). A different size-dependent behaviour of the elements was observed between open-sea and coastal areas, mainly due to differences in sediment sorting, and between the northern and central vs. southern Adriatic due to the different catchment geologies. The Fe and Mn (oxyhydr)oxides, abundant in the open-sea sediments, played an important role in the geochemical cycle of As, Cd, Co, Mo, Sb and V.

Item Type: Article
Uncontrolled Keywords: marine sediments; particle size; submicron particles; metals; organic matter; Adriatic Sea
Subjects: NATURAL SCIENCES > Interdisciplinary Natural Sciences
NATURAL SCIENCES > Interdisciplinary Natural Sciences > Marine Science
NATURAL SCIENCES > Interdisciplinary Natural Sciences > Environmental Science
Divisions: Division for Marine and Enviromental Research
Project titleProject leaderProject codeProject type
Nanominerali u sedimentima i tlima: formiranje, značajke i uloga u biogeokemijskim procesima; NanominSondi, Ivan2504UNSPECIFIED
Depositing User: Maja Ivanić
Date Deposited: 30 Nov 2023 15:15
DOI: 10.1016/j.chemosphere.2023.140461

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