Original scientific paper
https://doi.org/10.2478/10004-1254-60-2009-1919
Chemical Profile of Plomin Bay Sediments
Višnja Oreščanin
orcid.org/0000-0001-7382-472X
; USKNI, Laboratory for Applied Nuclear Analytics, Zagreb, Croatia
Karlo Nađ
; Institute Ruđer Bošković, Zagreb, Croatia
Anamarija Bartolinčić
; Belupo, Zagreb, Croatia
Vladivoj Vlaković
; Institute Ruđer Bošković, Zagreb, Croatia
Abstract
Granulometric, chemical, and leaching properties of sediments dredged in the Plomin Bay (Northern Adriatic Sea, Croatia) were investigated in order to asses the risk of remobilisation of heavy metals into the water column. In total 65 samples from 65 sampling sites were taken from different sediment depths within the bay. Analysis of variance confirmed the homogeneity of granulometric and elemental composition of the investigated sediment throughout its volume. Granulometric analysis showed that all samples corresponded to a pelitic fraction (<0.063 mm). Bulk elemental mass fractions in the sediments were similar to literature data on relatively unpolluted areas of the Adriatic Sea. High sedimentation rate caused by constant infl ow of material from the Boljunčica River drainage may be responsible for low levels of heavy metals and negligible infl uence of fl y and bottom ash from a nearby disposal site on the chemical composition of the sediments. In contact with sea water only 0.29 mg kg-1 of V, 0.04 mg kg-1 of Cr, 0.07 mg kg-1 of Ni, 0.33 mg kg-1 of Cu, 0.67 mg kg-1 of Zn and 0.06 mg kg-1 of Pb could be remobilised from sediment material into the water column. However, these values increased three to ten times in case of leaching with organic acids.
Keywords
dredging; heavy metals; leaching; marine sediments; organic complexes; remobilisation; sea water
Hrčak ID:
40675
URI
Publication date:
15.9.2009.
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