Naslov
Distribution of arsenic in the groundwater in Osječko-baranjska County, Eastern Croatia

Autori
Ujević, Magdalena ; Casiot, C. ; Santo, Vera ; Romić, Željko ; Duić, Željko ; Dadić, Željko ; Sipos, Laslo ; Halamić, Josip

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

Izvornik
Book of abstracts of the 2th International Congress on Arsenic in the Environment : Arsenic from Nature to Humanans / - , 2008

Skup
International Congress on Arsenic in the environment - Arsenic from nature to humans (2 ; 2008)

Mjesto i datum
Valencia, Španjolska, 21.05.2008. - 23.05.2008

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
arsenic; groundwater; Osječko-baranjska County

Sažetak
The presence of elevated concentrations of arsenic in drinking and stream water of Eastern Croatia has been recently evidenced (Ćavar et al., 2005 ; Salminen et al., 2005). However, the extent of As contamination was poorly known, as well as the processes that might explain groundwater As enrichment. The aim of this study was to investigate the As concentration and speciation in the groundwater of Osječko-baranjska County. Row water samples were taken from 30 groundwater wells used for public supply (more than 50m in depth) in March-April 2007. The wells were electrically pumped and samples were taken in the wellhead. Where it was not possible to reach a wellhead the samples were taken in the houses nearest to the wells, in which tap water was consumed without any treatment. In order to determine arsenic concentrations in shallow aquifers, the samples were taken from 9 private shallow wells (up to 15m in depth). Total arsenic concentrations were determined as well as pH, conductivity, dissolved O2, alkalinity, NH4, NO3-, Fe, Mn, SO42- and other major dissolved species. Water samples from ten wells were collected again in July 2007 for monitoring temporal variations in the groundwater composition and the As speciation. Results showed that the shallow wells were not polluted by arsenic (<1 µ ; ; g/L). However, in the deep groundwater wells, total dissolved arsenic concentration ranged from <1 µ ; ; g/L to 305 µ ; ; g/L. Arsenite, the dominant form of As, ranged from below the method detection limit to 287 µ ; ; g/L. Arsenate As(V) concentrations ranged from <1µ ; ; g/L to 170 µ ; ; g/L. It seems that the occurrence of arsenic in the groundwater of Eastern Croatia depend on the local geology, hydrogeology, and geochemical characteristics of the aquifer. The relative amount of As(III) and As(V) at residential tap water probably depend on the time of water retaining in the pipeline.

Izvorni jezik
Engleski

Znanstvena područja
Rudarstvo, nafta i geološko inženjerstvo

POVEZANOST RADA