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Mikroplastika predstavlja jedan od glavnih izvora zagađenja okoliša u svim ekosustavima pa tako i vodenim na globalnoj razini. U ovom radu proučavana je mikroplastika iz stupca vode, sedimenta i riba rijeke Save na tri točke. Ukupno je uzorkovano 6 uzoraka iz stupca vode, 12 uzoraka sedimenta i 6 riba. U svim uzorcima je prvo uklonjena organska tvar, a u uzorcima sedimenta i stupca vode je uklonjena i karbonatna komponenta. Nakon toga, metodom separacije na temelju gustoće, koja je za potrebe ovog rada rađena otopinom natrijevog polivolframata (SPT-om) gustoće 1,65 g/cm3 izdvojena je mikroplastika te su uzorci podvrgnuti vizualnom pregledu pod lupom. Identifikacija mikroplastike je rađena na FTIR-u (Fourier-transform infrared spectroscopy) te su identificirane 2 vrste mikroplastike: polipropilen (PP) i najlon. Dominantna boja izdvojenih čestica je crna, ali su pronađene i čestice drugih boja poput plave i crvene boje, a većina čestica je vlaknastog oblika. U uzorcima sedimenta broj čestica mikroplastike se povećava nizvodno od točke 1 prema točki 3 te je na točki 3 najveći. U uzorcima dobivenim iz suspenzije vode broj čestica se smanjuje nizvodno od točke 1 prema točki 3 dok je u uzorcima riba najmanja količina mikroplastičnih čestica zabilježena u točki 2, a najveća u točki 3 Microplastic represents one of the main sources of environmental pollution in all ecosystems, including aquatic ones at global level. This research studied microplastic from water column, sediment and fish of Sava River from three locations. Six (6) water columns, twelve (12) sediment and six (6) fish samples were examined in total. First, organic matter was removed from all samples, then the carbonate component was removed from sediment and water column samples. Subsequently, using density separation method, which was performed for the purposes of this research using the solution of sodium polyhydrate (SPT) with a density of 1.65 g/cm3, microplastic was separated, and all the samples were subjected to visual inspection under a magnifying glass. Identification was performed on FTIR (Fourier-transform infrared spectroscopy) and two types of microplastic were identified: polypropylene (PP) and naylon. The dominant color of the isolated particles was black, but particles of other colors such as blue and red were also present, most of the particles fibrous in shape. In sediment samples, the number of microplastic particles increases downstream from point 1 to point 3 and is highest at point 3. In samples obtained from the suspension of water, the number of particles decreases downstream from point 1 to point 3, while in fish samples the smallest amount of microplastic particles was found at point 2 and the largest at point 3. |
