20.500.12556/RUL-117717 Vpliv različnih tipov tal na asimilacijo srebra v kopenske rake Influence of different soil types on assimilation of silver in terrestrial isopods Srebrovi nanodelci (Ag ND) se najpogosteje od vseh nanodelcev uporabljajo za izdelavo potrošniških produktov, s katerimi nato zaidejo v okolje. Glavni ponor za Ag ND je odpadno blato čistilnih naprav, s katerim se Ag ND lahko prenesejo v kopenske ekosisteme, predvsem z blatom gnojena kmetijska zemljišča. Na podlagi neznatnega števila raziskav na temo vpliva Ag ND na posamezne organizme na standardnih zemljah ni mogoče sklepati o stopnji bioakumulacije na zemljah, ki so prisotne v okolju. V magistrskem delu smo biokinetiko različnih oblik srebra (Ag ionov, Ag ND in Ag2S) analizirali s preučevanjem v zemlji živečih kopenskih rakov enakonožcev P. scaber na štirih testnih zemljah z različnimi fizikalno kemijskimi lastnostmi. Naši rezultati podpirajo ugotovitve drugih raziskav, ki pravijo, da organizmi Ag med izpostavitvijo Ag ND bioakumulirajo zaradi privzema raztopljenih Ag ionov. Minimalno bioakumulacijo Ag smo opazili v primeru sulfidiranih Ag ND, ki so manj biološko dostopni od Ag ND. Tak rezultat je iz okoljevarstvenega vidika pozitiven, saj se med staranjem večina Ag ND v zemlji preobrazi v sulfidirane Ag ND. Med fizikalno-kemijskimi lastnostmi zemelj na bioakumulacijo Ag najpomembneje vplivata pH in delež organske snovi, čeprav vpliv ostalih lastnosti ni zanemarljiv. Da bi popolnoma osvetlili vlogo lastnosti zemlje na biološko dostopnost Ag, bi morali teste opraviti v večjem obsegu in z več različnimi tipi zemlje. Silver nanoparticles (AgNPs) are the most used NP in consumer products and mainly end up in water environment. Within the wastewater-treatment, sewage sludge represents a major sink for AgNPs. This sludge is then used worldwide as a fertilizer in agriculture. Existing studies were performed on standard soils and selected organisms, which means there is not enough data to conclude whether silver in the environmental soils is available to higher trophic levels. In this study we used four soils with different physical and chemical characteristics to analyze biokinetics of different silver species (Ag ions, AgNPs, Ag2S) in terrestrial isopod P. scaber. Our results support the findings of other studies, affirming that during the exposure to AgNPs the Ag is bioaccumulated because of the uptake of dissolved Ag ions. In the case of Ag2S negligible amount of bioaccumulation was observed, since this form is considerably less bioavailable compared to AgNPs. This is a positive finding from the nature conservation perspective, as AgNPs are expected to efficiently convert to sparingly soluble Ag2S during the ageing process. Our results show that soil pH and organic matter content are the soil characteristics with the strongest influence on Ag bioavailability of all the tested soil characteristics. However, more experiments using several different soil types are needed to completely understand the impact of soil properties on Ag bioavailability. nanodelci srebro lastnosti zemlje asimilacija kopenski rak enakonožec Porcellio scaber nanoparticles silver soil characteristics assimilation terrestrial isopod Porcellio scaber true false false Slovenski jezik Angleški jezik Magistrsko delo/naloga 2020-07-23 07:15:57 2020-07-23 07:16:02 2022-08-30 03:59:48 0000-00-00 00:00:00 2020 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1970-01-01 176013 26770179 10427.pdf 10427.pdf 1 5DD76EA7A4ABEE435592EF5D7674B4FF 10d15829de9567168173974007b87c6348c86391595d7e6df58429a1988f8aa8 3f83ebee-a1b9-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=131613 Biotehniška fakulteta 0 0 0