diplomsko delo
Melanija Hadolin (Author), Irena Kralj Cigić (Mentor)

Abstract

Benzotriazol je predstavnik mobilnih in obstojnih spojin, ki zaradi neprekinjenega vnosa in slabe biorazgradljivosti dolgo ostajajo v okolju. Benzotriazol se masovno uporablja v vlogi UV stabilizatorja za plastične materiale in kot zaviralec korozije za različne kovine, zato ga najdemo v embalaži za hrano, plastiki, tekstilu, detergentih za pomivanje posode, zavornih in hladilnih tekočinah ter sredstvih proti zmrzovanju. O prepovedi njegove uporabe v EU še ni zakonodaje, je pa uvrščen na seznam zaskrbljujočih novih snovi, saj je ob kronični izpostavljenosti potencialno karcinogen in hormonski motilec. Za določitev se lahko uporabljajo klasične kromatografske in spektrofotometrične tehnike, kot alternativa dolgo trajajočim in zahtevnejšim analizam pa se lahko uporabljajo elektrokemijske tehnike, natančneje voltametrija, saj je benzotriazol elektroaktivna spojina in se v kislem okolju reducira. V diplomskem delu sta bili za določitev lastnosti in kvantitativno določitev uporabljeni ciklična voltametrija in voltametrija s kvadratnimi valovi. Namesto klasične elektrokemijske celice so bile uporabljene sitotiskane elektrode, ki so minituariziran trielektrodni sistem, z ogljikovo delovno elektrodo, srebrovo kvazi-referenčno elektrodo in platinasto protielektrodo. Za doseženo mejo zaznave 2,4 µM oziroma 300 ppb je bila narejena modifikacija ogljikove delovne elektrode z enostenskimi ogljikovimi nanocevkami z dodatkom Nafiona.

Keywords

benzotriazol;sitotiskana elektroda;modifikacija elektrode;ogljikove nanocevke;elektrokemijske lastnosti;diplomska dela;

Data

Language: Slovenian
Year of publishing:
Typology: 2.11 - Undergraduate Thesis
Organization: UL FKKT - Faculty of Chemistry and Chemical Technology
Publisher: [M. Hadolin]
UDC: 543.552(043.2)
COBISS: 203366147 Link will open in a new window
Views: 84
Downloads: 18
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Other data

Secondary language: English
Secondary title: Electrochemical detection of benzotriazole with screen-printed electrodes in aqueous media
Secondary abstract: Benzotriazole is a representative of mobile and persistent compounds that remain in the environment for a long time due to continuous intake and poor biodegradability. Benzotriazole is widely used as a UV stabilizer for plastic materials and as a corrosion inhibitor for various metals, which is why it is found in food packaging, plastics, textiles, dishwashing detergents, brake and coolant fluids, and antifreeze. Currently, there is no legislation in EU for banning its use, but it is included in the list of emerging contaminants, as it is a potential carcinogen and disruptor of the hormonal system upon chronic exposure. Classical chromatographic and spectrophotometric techniques can be used for determination, and as an alternative to long-lasting and demanding analyses, electrochemical techniques can be used, specifically voltammetry, since benzotriazole is an electroactive compound and is reduced in an acidic environment. To determine properties and for quantitative determination cyclic voltammetry and square wave voltammetry were used in the thesis. Instead of a classic electrochemical cell, screen-printed electrodes were used, which are a miniaturized three-electrode system, with a carbon working electrode, a silver quasi-reference electrode, and a platinum counter electrode. To achieve a detection limit of 2,4 µM or 300 ppb, a modification of the carbon working electrode with single-walled carbon nanotubes with the addition of Nafion was made.
Secondary keywords: benzotriazole;sreen-printed electrode;voltammetry;electrode modification;Voltametrija;Univerzitetna in visokošolska dela;
Type (COBISS): Bachelor thesis/paper
Study programme: 1000373
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. v Ljubljani, Fak. za kemijo in kemijsko tehnologijo, UNI Kemija
Pages: 1 spletni vir (1 datoteka PDF (36 str.))
ID: 24518463