Vpliv različnih tipov tal na asimilacijo srebra v kopenske rake

Lobe, Katja (author), Jemec Kokalj, Anita (mentor)

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.

• Language: Slovenian
• Keywords: nanodelci, srebro, lastnosti zemlje, asimilacija, kopenski rak enakonožec Porcellio scaber
• Work type: Master's thesis/paper
• Organization: BF - Biotechnical Faculty
• Year: 2020
• PID: 20.500.12556/RUL-117717
• COBISS.SI-ID: 26770179
• Publication date in RUL: 23.07.2020

LOBE, Katja, 2020, Vpliv različnih tipov tal na asimilacijo srebra v kopenske rake [online]. Master’s thesis. [Accessed 30 March 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=117717

Secondary language

• Language: English
• Title: Influence of different soil types on assimilation of silver in terrestrial isopods

Abstract

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.

• Keywords: nanoparticles, silver, soil characteristics, assimilation, terrestrial isopod Porcellio scaber