Bioakumulacija esencijalnih i toksičnih elemenata u mišićnom tkivu bijelog klena (Squalius squalus Bonaparte, 1837) iz rijeke Raše

master's thesis

• Title (english): Bioaccumulation of essential and toxic elements in the muscle tissue of Italian chub (Squalius squalus Bonaparte, 1837) from the Raša river
• Author: Dora Šebešćen
• Mentor: Davor Zanella (mentor)
• Mentor: Zorana Kljaković-Gšpić (mentor)
• Committee member: Davor Zanella (predsjednik povjerenstva)
• Committee member: Sandra Hudina (član povjerenstva)
• Committee member: Jasna Lajtner (član povjerenstva)
• Committee member: Ivana Maguire (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Biology); Zagreb
• Defense date and country: 2021-09-28, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Biology

Abstract

Područje istočno od rijeke Raše stotinama je godina korišteno za rudarske aktivnosti zbog velikih naslaga ugljena koji je specifičan po sastavu kojeg karakteriziraju visoke koncentracije toksičnih metala i selenija. Ispiranje cjelokupnog područja kišama i podzemnim vodama može nataložiti esencijalne i toksične elemente u rijeke i negativno utjecati na cijeli vodeni ekosustav. Iako se na tom području provode ispitivanja tla, vode i sedimenta, nedostaje upotreba bioindikatora za procjenu stanja okoliša. Zbog toga je cilj ovog rada bio istražiti koncentracije 14 esencijalnih i 7 neesencijalnih (toksičnih) elemenata u mišićnom tkivu bijelog klena (Squalius squalus Bonaparte, 1837) i u riječnim sedimentima rijeke Raše. Jedinke i sediment uzorkovani su na dvije postaje u rijeci Raši te su koncentracije ispitane metodom masene spektrofotometrije uz induktivno spregnutu plazmu. U mišićnom tkivu svi elementi su normalnih vrijednosti te su ispod granica koje su propisane odredbama. Vrijednosti u sedimentu su u skladu sa sastavom okolnog tla, a povećane vrijednosti elemenata Fe, Cr, Mg, Ni i Se prirodnog su podrijetla te odražavaju geološku podlogu slivnog područja. To potvrđuju dubinski profili svih elemenata osim za Mo, Se i U koji su malo povišeni u površinskom sloju što ukazuje na mogući antropogeni utjecaj koji treba dodatno istražiti.

Abstract (english)

The area east of the Raša River has been used for mining activities for hundreds of years due to its large coal deposits, which are specific in composition and are characterized by high concentrations of metall(oid)s. Flushing of the entire area with rain and groundwater can deposit heavy metals in rivers and negatively affect entire aquatic ecosystem. Although soil, water and sediment tests were carried out in the area, the use of bioindicators to assess the state of the environment is lacking. Therefore, the aim of this study was to investigate the concentrations of 14 essential and 7 non-essential (toxic) elements in the muscle tissue of white chub (Squalius squalus Bonaparte, 1837) and in the river sediments of the Raša River. Fish and sediment were sampled at two stations in the Raša River, and concentrations were examined with inductively coupled plasma mass spectrophotometry. In muscle tissue, all elements are of normal values that are below the limits set by regulations. Values in sediments are in accordance with the elemental composition of the surrounding soil. The increased values of Fe, Cr, Mg, Ni and Se are of natural origin, reflecting the geological baseline values of the catchment area. This is confirmed by the depth profiles of all elements except Mo, Se and U, whose elevated concentrations in surface layer indicate possible anthropogenic impact that merits further investigation.

• Keywords: ugljen; teški metali; bioindikatori
• Keywords (english): coal; heavy metals; bioindicators
• Language: croatian
• URN:NBN: urn:nbn:hr:217:911578
• Study programme: Title: Ecology; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra ekologije i zaštite prirode (magistar/magistra ekologije i zaštite prirode)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2021-10-05 12:39:11