Primjenjivost anoda modificiranih s oksidima metala u amperometrijskim metodama procjene kemijske potrošnje kisika

master's thesis

• Title (english): Applicability of metal oxide-modified anodes in amperometric determination of chemical oxygen demand
• Author: Anja Britvec
• Mentor: Damir Iveković (mentor)
• Granter: University of Zagreb; Faculty of Food Technology and Biotechnology; (Department of Chemistry and Biochemistry); (Laboratory for General and Inorganic Chemistry and Electroanalysis); Zagreb
• Defense date and country: 2012-02-28, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Biotechnology

Abstract

Jedan od pokazatelja kojim se određuje kvaliteta vode jest kemijska potrošnja kisika (KPK), parametar koji procjenjuje sadržaj organskih tvari u vodi koje se mogu kemijski oksidirati do CO2. Standardne metode mjerenja KPK temelje se na oksidaciji organskih tvari u uzorku pomoću kemijskog oksidansa pri povišenoj temperaturi. Nedostatak im je dugačko vrijeme analize, uporaba toksičnih i ekološki neprihvatljivih kemikalija te ograničene mogućnosti automatizacije. U ovom je radu istražena mogućnost primjene elektroda modificiranih oksidima olova (PbO2) i bakra (CuO) kao amperometrijskih senzora za procjenu vrijednost KPK. Utvrđeno je da su elektrode modificirane filmovima CuO potencijalno primjenjive za određivanje KPK u sustavima s niskom vrijednošću KPK (<10 mg O2 L–1), u kojima ne dolazi do značajnijih varijacija u broju i vrsti prisutnih organskih spojeva te promjena u njihovom relativnom udjelu. Navedeni nedostaci CuO-elektroda kompenzirani su jednostavnošću, niskom cijenom i mogućnošću automatizacije mjerenja.

Abstract (english)

One of the indicators used in determining water quality is chemical oxygen demand (COD), a parameter that assesses the content of organic matter in water, which can be chemically oxidised to CO2. Standard methods of measuring COD are based on oxidation of organic matter in a sample by using chemical oxidants at elevated temperature. Some of the drawbacks of the standard methods for COD determination are length of the analysis, employment of toxic and ecologically unacceptable chemicals, and limited capabilities for method automation. In this work, the possibilities of applying electrodes modified by lead dioxide (PbO2) and copper oxide (CuO) as amperometric sensors for COD determination were explored. It was found that the electrodes modified with CuO films are potentially applicable for COD determination in systems with low COD (<10 mg O2 L-1), which are not susceptible to significant variations in number and relative content of organic compounds. These drawbacks of CuO-modified electrodes are compensated by their simplicity and affordable price, as well as the possibility of automatization of the COD measuring method.

• Keywords: KPK; CuO-elektroda; PbO2-elektroda; amperometrijski senzor
• Keywords (english): COD; CuO-electrode; PbO2-electrode; amperometric sensor
• Language: croatian
• URN:NBN: urn:nbn:hr:159:320750
• Study programme: Title: Biotechnology; specializations in: Biochemical Engineering; Course: Biochemical Engineering; Study programme type: university; Study level: graduate; Academic / professional title: diplomirani inženjer biotehnologije; smjer biokemijsko inženjerstvo (diplomirani inženjer biotehnologije; smjer biokemijsko inženjerstvo)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2017-05-18 07:15:11