Provider: - Institution: Josip Juraj Strossmayer University of Osijek. FACULTY OF FOOD TECHNOLOGY. Department of Applied Chemistry and Ecology. Sub-department of Chemistry and Ecology. - Data provided by Europeana Collections- Monitoringom kakvoće podzemne vode crpilišta osječkog vodovoda, polučio se uvid u kakvoću vode izvorišta u opsegu dubine 30-180 m. Tijekom vremena kakvoća podzemne, nepreradene vode u fizičko-kemijskom i mikrobiološkom pogledu značajnije se ne mijenja, te je njen sastav uzrokovan geološkim uvjetima vodonosnika. U ovom radu provedena je karakterizacija pojavnih oblika arsena As(III), As(V) na određenim dubinama vodonosnih slojeva. Arsen na crpilištu Vinogradi uglavnom je u obliku As (III) i iznosi oko 96 % količine ukupnog arsena. Određivanje koncentracije ukupnog arsena i As (III) provedeno je anodnom striping voltametrijskom tehnikom (ASV) s bočno postavljenom zlatnom elektrodom. Obzirom da je As (III) oblik vrlo toksičan i izuzetno ga je teško ukloniti predmet ovog istraživanja je utvrđivanje uspješnosti različitih oksidacijskih sredstava (vodik-peroksid, kalij permanganat, ozon) za oksidaciju arsenita, uz optimalne pH vrijednosti, kontaktno vrijeme, kao i racionalno optimizirano doziranje nužnih kemikalija za izdvajanje arsena. Ovim radom nastojalo se pridonijeti dugoročnom unaprjeđenju kakvoće pitke vode u Osječko-baranjskoj županiji. Istraživanje koje je tema ove disertacije posebno je aktualno u zadnje vrijeme, budući da je koncentraciju arsena u pitkoj nužno dovesti u granice koje zahtijeva EU.- By monitoring the quality of underground water in the area of waterintake for the city Osijek, the insight into the quality of water source in the range of depth 30-180 m was obtained. During the time, the quality of groundwater in the physico-chemical and microbiological respect, does not have significant changes, so that its composition is caused by geological conditions of aquifer . In this work, the characterisation of arsenic appearance shapes As (III), As (V) in the certain depths of water-carrieng soil layers, was carried out. Arsenic in water intake area Vinogradi is mainly in the form of As (III) and makes about 96% of arsenic total amount. Determination of the concentration of total arsenic and arsenic (III) have been carried out by anodic stripping voltametric technique (ASV) with the gold electrode, set sideways. Regarding that the As (III) form is very toxic and that it is extremely difficult to remove it, the subject of this research is determining the efficiency of different oxidated agents (hydrogen-peroxide, potassium permanganate, ozone) for oxidation of As (III) , at optimal pH, contact time, as well as determining the rational optimized dosage of chemicals, needed to extract arsenic. The intention of this work was to contribute to the long-term improvement of the drinking water quality in the Osijek-Baranja County. The research, that is subject of this dissertation, is particularly actual lately, because it is necessary to get the concentration of arsenic in drinking water into the limits required by the EU.- All metadata published by Europeana are available free of restriction under the Creative Commons CC0 1.0 Universal Public Domain Dedication. However, Europeana requests that you actively acknowledge and give attribution to all metadata sources including Europeana