Urban geochemistry: distribution of heavy metals in extractional fraction of rendzina on deposol and fluviosol in City of Sisak : master's thesis

U sklopu europskog projekta „Urban Geochemistry in Europe (URGE)–Soil, Childern, Health“, čiji je cilj geokemijsko kartiranje određenih europskih gradova pomoću jedinstvenih metoda te izrada geokemijske karte urbanog tla za različite kemijske elemente, kao grad predstavnik Republike Hrvatske odabran je grad Sisak. U širem području grada odabrana su tri pedološka profila (profili PR 3, PR 4 i PR 5) na kojima su provedena terenska i laboratorijska istraživanja. Ukupno je analizirano petnaest uzoraka (šest iz profila PR 3, šest iz profila PR 4 te 3 iz profila PR 5). Profil PR 3 razvijen je na rendzini na deposolu, dok su profili PR 4 i PR 5 razvijeni na aluvijalno livadskom tlu. Sekvencijskom ekstrakcijskom analizom prema BCR proceduri, određeni su udjeli Cd, Cr, Cu, Ni, Pb, Zn, Mn i Fe u četiri frakcije: (1) karbonatnoj, (2) frakciji Fe – Mn oksida i hidroksida, (3) organsko – sulfidnoj (reduktivnoj) te (4) rezidualnoj frakciji. Analiza ekstraktanata je izvršena primjenom atomske apsorpcijske spektrometrije (AAS). Dobiveni podaci uspoređeni su s vrijednostima u relevantnim pravilnicima o onečišćenju tla. Utvrđeno je da niti jedan istraživani profil nije onečišćen teškim metalima. Ovo istraživanje pokazalo je da bi bilo nužno izraditi pravilnik koji će se temeljiti na upotrebi zemljišta kako bi se moglo pravovaljano ocijeniti stupanj onečišćenja.Abstract: The goal of the European project „Urban Geochemistry in Europe (URGE) – Soil, Childern, Health“ is a geochemical mapping of specific European cities using an unique method and production of an urban soil geochemical maps for different chemical elements. As the part of the project, city Sisak was chosen to be main representative of Republic of Croatia. Field and laboratory research were conducted on the three pedological profiles chosen in wider area of Sisak (PR 3, PR 4 i PR 5). Overall, the research was made on fifteen samples, six from profile PR 3, six from profile PR 4 and three from profile PR 5. Profile PR 3 is developed on the rendzina on deposol soil, while profiles PR 4 and PR 5 are developed on fluviosol.The sequential-extraction scheme recommended by BCR was used and Cd, Cr, Cu, Ni, Pb, Zn, Mn and Fe were determined in four fractions: 1) carbonate fraction, 2) Fe – Mn oxides and hydroxides fraction, 3) organic – sulphide fraction and 4) residual fraction. The analysis was performed by using an atomic absorption spectrophotometer (AAS). The final results were compared with the relevant rulebook values of the soil contamination. It was determined that neither of invastigated profiles is contamited with heavy metals. This research proved that it would be necessary and vital to do the rulebook based on the level of soil use to determine the level of contamination