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Pregled bibliografske jedinice broj: 759573

Marine lake as in situ laboratory for studies of organic matter influence on speciation and distribution of trace metals


Mlakar, Marina; Fiket, Željka; Geček, Sunčana; Cukrov, Neven; Cuculić, Vlado
Marine lake as in situ laboratory for studies of organic matter influence on speciation and distribution of trace metals // Continental shelf research, 103 (2015), 1-11 doi:10.1016/j.csr.2015.04.024 (međunarodna recenzija, članak, znanstveni)


Naslov
Marine lake as in situ laboratory for studies of organic matter influence on speciation and distribution of trace metals

Autori
Mlakar, Marina ; Fiket, Željka ; Geček, Sunčana ; Cukrov, Neven ; Cuculić, Vlado

Izvornik
Continental shelf research (0278-4343) 103 (2015); 1-11

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Marine lake; geochemical processes; trace metals; sediments; organic matter

Sažetak
Karst marine lakes are unique marine systems, also recognized as in situ “laboratories” in which geochemical processes on a different scale compared to the open sea, can be observed. In this study, organic matter cycle and its impact on distribution of trace metals in the marine lake Mir, located on Dugi Otok Island, in the central part of the eastern Adriatic Sea, was investigated for the first time. Studied marine lake is small, isolated, shallow basin, with limited communication with the open sea. Intense spatial and seasonal variations of organic matter, dissolved and particulate (DOC, POC), and dissolved trace metals concentrations in the water column of the Lake are governed predominantly by natural processes. Enhanced oxygen consumption in the Lake during summer season, high DOC and POC concentrations and low redox potential result in occasional occurrence of anoxic conditions in the bottom layers with appearance of sulphur species. Speciation modelling showed that dissolved trace metals Cu, Pb and Zn, are mostly bound to organic matter, while Cd, Co and Ni are present predominantly as free ions and inorganic complexes. Trace metals removal from the water column and their retention in the sediment was found to depend on the nature of the relationship between specific metal and organic or inorganic phases, sulphides, Fe-oxyhydroxydes or biogenic calcite. The above is reflected in the composition of the sediments, which are, in addition to influence of karstic background and bathymetry of the basin, significantly affected by accumulation of detritus at the bottom of the Lake.

Izvorni jezik
Engleski

Znanstvena područja
Geologija, Kemija



POVEZANOST RADA


Projekt / tema
HRZZ-8607

Ustanove
Institut "Ruđer Bošković", Zagreb

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


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