diplomsko delo
Amadeja Sajovic Žulovec (Author), Gabriela Kalčíková (Mentor)

Abstract

Plastika je zaradi svojih lastnosti izredno uporaben material, ki ga zaradi množične uporabe in nepravilnega ravnanja veliko pride v vodne in kopenske ekosisteme. V zadnjem času je največ pozornosti posvečeno majhnim plastičnim delcem, ki jih imenujemo mikroplastika (< 1 mm). V okolju sta prisotni tako primarna kot sekundarna mikroplastika (< 1 mm). Sekundarna mikroplastika nastane, ko plastika pod vplivom različnih dejavnikov razpada na manjše fragmente. Primarna mikroplastika se veliko uporablja v kozmetiki in produktih za osebno nego, kar je en od razlogov, da lahko pristane v odpadni vodi ter posledično v vodnem ekosistemu. V odpadni vodi se lahko na mikroplastiko adsorbirajo ostala prisotna onesnaževala, med drugimi tudi kovinski nanodelci, ki so prav tako prisotni v kozmetičnih izdelkih. Mikroplastika se lahko obnaša kot vektor za prenos onesnaževal in spremeni njihovo biološko dostopnost in strupenost, s tem pa vpliva na vodne organizme. Zato smo v okviru diplomskega dela proučevali vpliv mikroplastike z adsorbiranimi nanodelci na malo vodno lečo (Lemna minor) in sicer smo določali vpliv na specifično hitrost rasti, vsebnost klorofila a in b, dolžino korenin, določili pa smo tudi količino desorbiranih nanodelcev tekom poskusa. Rezultati so pokazali, da mikroplastika z adsorbiranimi nanodelci TiO2 in ZnO ne vpliva na specifično hitrost rasti in koncentracijo klorofila a. Zaznali smo vpliv na rast korenin ter na koncentracijo klorofila b. Po sedmih dneh inkubacije se je 15,7 % TiO2 in 53,0 % ZnO desorbiralo v vodo.

Keywords

vodni ekosistem;mala vodna leča;onesnaževala;mikroplastika;kovinski oksidi;nanodelci;diplomska dela;

Data

Language: Slovenian
Year of publishing:
Typology: 2.11 - Undergraduate Thesis
Organization: UL FKKT - Faculty of Chemistry and Chemical Technology
Publisher: [A. Sajovic Žulovec]
UDC: 504.5(043.2)
COBISS: 121720835 Link will open in a new window
Views: 22
Downloads: 11
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Other data

Secondary language: English
Secondary title: The combined effect of microplastics and nanoparticles on aquatic organisms
Secondary abstract: Plastic is an exceptionally useful material, because of its good properties. However, its massive use and improper handling with plastic waste has resulted in plastic pollution of aquatic and terrestrial ecosystems. Recently a lot of attention has been given to small plastic particles called microplastics (< 1 mm). In the environment, both primary and secondary microplastics are present. Secondary microplastics occur when plastics are broken down into smaller fragments due to various environmental factors. On the other hand, primary microplastics are widely used in cosmetics and personal care products and can end up in wastewaters and eventually in the aquatic ecosystem. Other pollutants that are present in wastewater can adsorb on the surface of microplastics, including metal nanoparticles, which are also present in cosmetics. Microplastics can act as a vector for pollutants, altering their bioavailability and toxicity and thus affecting aquatic organisms. In this work we studied the effect of microplastics with adsorbed nanoparticles on duckweed Lemna minor. We studied the impact on the specific growth rate, the chlorophyll a and b contents and root length. We also determined the amount of desorbed nanoparticles during the experiment, The results showed that microplastics with adsorbed TiO2 and ZnO nanoparticles do not affect the specific growth rate and chlorophyll a content. However, we observed inhibition on root length and chlorophyll b content. After the seven-day incubation period 15,7 % and 53,0 % of TiO2 and ZnO, respectively, was desorbed from microplastics.
Secondary keywords: aquatic ecosystem;duckweed;metal oxides;microplastics;nanoparticles;Univerzitetna in visokošolska dela;
Type (COBISS): Bachelor thesis/paper
Study programme: 1000372
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. v Ljubljani, Fak. za kemijo in kemijsko tehnologijo, UNI Kemijsko inženirstvo
Pages: 25 str.
ID: 16317292