Naslov
Exchangeable fraction of elements in alluvial sediments under waste disposal site (Zagreb, Croatia)

Autori
Vertačnik, Astrea ; Barišić, Delko ; Musani, Ljerka ; Prohić, Esad ; Juračić, Mladen

Izvornik
Journal of radioanalytical and nuclear chemistry (0236-5731) 218 (1997), 1; 45-52

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

Ključne riječi
alluvial sediment; exchangeable elements; waste disposal site; Ag; 0.5 M NH4Cl leaching; INAA

Sažetak
Concentrations of Ag, Ba, Cd, Ce, Cs, Co, Cr, Eu, Fe, Rb, Sc, Sr, Th, and Zn exchangeable fractions were determined in alluvial sediments at waste disposal site area in the vicinity of water-well field. Samples have been leached with 0.5 M NH4Cl at a sample/solution ratio of 1:20 during 24 hours without shaking. INAA of dry NH4Cl residues show that concentrations of exchangeable elements determined in the most of sediments below wastes have natural levels. Ag, Ba and Sr are readily exchangeable ; Rb, Cs and Zn have lower exchangeability, while Cd, Ce, Th, Sc, Eu, Cr, Fe and Co are rather immobile. Extremely high total and exchangeable silver concentration was found at 6.5-6.8 meters below waste in the aerated layer occasionally under the water table. Exchangeable concentrations in deeper water-bearing sediment layers are not elevated. Due to this, one can presume that upper sediment layers act as chemical filter generally preventing the infiltration from overlying wastes into water-bearing layers.

Izvorni jezik
Engleski

Znanstvena područja
Geologija, Kemija

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