Geochemical and mineralogical characteristics of soil from the Petruševec well field area : master’s thesis

Predmet ovog diplomskog rada su uzorci tla prikupljeni na području vodocrpilišta Petruševec. Cilj je bio odrediti geokemijske i mineraloške karakteristike tla u svrhu karakterizacije mogućeg onečišćenja podzemne vode s potencijalno toksičnim metalima. Uzorkovanje tla je izvršeno u drugoj zoni sanitarne zaštite vodocrpilišta Petruševec. Nakon provedenog terenskog istraživanja, uzorci tla su u proljeće, ljeto i jesen 2018. godine analizirani u laboratoriju na Zavodu za mineralogiju, petrologiju i mineralne sirovine, Rudarsko-geološko-naftnog fakulteta u Zagrebu. Atomskom apsorpcijskom spektrometrijom (AAS) izvršeno je mjerenje koncentracije Zn, Mn, Cu, Cr, Ni, Fe, Pb i Cd. Izuzev povišenih koncentracija Fe i Mn utvrđene su značajne koncentracije Cr i Ni. Ni u analiziranim uzorcima višestruko prelazi zakonom propisane vrijednosti pri čemu je najveća izmjerena koncentracija na dubini od 190 cm. Koncentracije kroma slično je raspoređena po profilu tla, a uočeno je kako su koncentracije nikla i kroma veće na dubini od 70 do 190 cm s najvećim vrijednostima na 190 cm dubine. Izvor nikla i kroma je moguće antropogenog podrijetla vezan za aerodepoziciju s obližnje zračne luke, otpad koji odložen u blizini područja uzorkovanja ili prirodnog podrijetla iz stijena bogatih ovim metalima.The subject of this thesis are soil samples collected at the Petruševec well field area. The aim of this research was to determine geochemical and mineralogical characteristics of soil to determine a possible groundwater contamination with toxic metals. Soil sampling took place in the second zone of sanitary protection of the Petruševec water well field. After fieldwork, soil samples were analyzed during spring, summer and autumn of 2018 at the Department of Mineralogy, Petrology and Mineral Resources at the Faculty of Mining, Geology and Petroleum Engineering, University of Zagreb. Measurement of concentration of Zn, Mn, Cu, Cr, Ni, Fe, Pb and Cd was conducted using atomic absorption spectroscopy (AAS). Except high concentrations of Fe and Mn, significant concentrations of Cr and Ni were also detected. In analyzed samples Ni exceeds values provided by the law multiple times and highest measured concentration was determined at depth of 190 cm. Concentrations of chromium are similarly distributed over the soil profile, and it can be noticed that chromium and nickel concentrations are higher in the depth range from 70 to 190 cm while the highest values were recorded at the depth of 190 cm. The source of chromium and nickel could be anthropogenic, related to aero deposition from the airport, from waste near sampling area, or natural from rocks rich with these metals