Naslov
Influence of the landfill site on the lake sediments of Vransko Lake, Croatia

Autori
Fajković, Hana ; Prohić, Esad ; Pitarević Svedružić, Lovorka ; Rončević, Sanda ; Habuš, Zvonko

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Skup
29th International Conference on environmental Geochemistry and Health

Mjesto i datum
Toulouse, Francuska, 08.06.2013. - 12.06.2013

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Heavy metals ; Lake sediments ; Landfill ; ICP ; MS ; Sequential extraction

Sažetak
The objective of the study was to investigate the Vransko Lake sediments, and soils from a nearby landfill. Three sediment cores, 50- cm- deep, were sampled in different parts of the lake in order to determine whether there is pollution of the sediments and if it could be linked to the landfill –i.e. if it is higher in its vicinity. Sample DOK-55 is closest to the landfill while DOK-26 is the furthest. The hydrogeological characteristics of the analysed area, from the landfill to the lake, imply a high permeability and porosity, due to the system of fractures and karstification processes. Transport of contaminants is very likely to occur under these conditions. Multielement (Cu, Pb, Zn, Cd, Ni, Co, Mn, Cr, As, Mo, U, Hg, Ag, Al and Fe) determination by ICP-MS, after Aqua Regia digestion, was performed on a total of 19 samples. Soil sample was also leached with ammonium acetate (1 M), to determine the amount of easily leachable elements. As expected, concentrations of trace metals in the landfill soils were higher than those found in the sediments. Likewise, the results of ammonium acetate leachate also showed high values –i.e. high lixiviation potential. Values of all analysed samples from three deferent sediment cores and values from the landfill site, including the leachant analysis, are presented in Fig 1. Pollution of the lake sediments with trace metals by the landfill is suggested by: a) spatial geochemical heterogeneity of the sediments throughout the lake, with the higher values of the potentially leachable metals in the core located closer to the landfill ; b) larger concentrations of trace metals in the surface layer (0-3 cm) in comparison to deeper, most likely unpolluted, layers (36-38 cm) ; and c) high concentrations of trace metals in the leachate, which surpass the one from a similar landfill sites.

Izvorni jezik
Engleski

Znanstvena područja
Geologija, Kemija

POVEZANOST RADA