Degradation of organic compounds with ultraviolet light in the presence of peroxodisulphate

master's thesis

• Title: Degradacija organskih spojeva ultraljubičastom svjetlošću u prisutnosti peroksodisulfata
• Author: Ines Špilko
• 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: 2011-07-11, Croatia
• Scientific / art field, discipline and subdiscipline: BIOTECHNICAL SCIENCES; Food Technology

Abstract

U radu su provedena istraživanja degradacije organskih spojeva sulfatnim radikalima nastalim fotolizom peroksodisulfatnog aniona pod utjecajem UV zračenja. Istražena je degradacija 14 organskih spojeva iz skupine alifatskih kiselina, aromata, heterocikličkih spojeva, aminokiselina, organskih bojila i visoko kondenziranih spojeva kao što su fulvinske i huminske kiseline. Istraživanja su provedena u protočnim uvjetima koji podsjećaju na realne uvjete rada on-line analizatora. Pokazano je da je brzina degradacije organskih spojeva sulfatnim radikalima višestruko veća od brzine degradacije uslijed UV fotolize organskih spojeva. Za uzorke s vrijednošću TOC od otprilike 10 mg/L u protočnim je uvjetima primjenom UV-persoksodisulfat metode ostvarena degradacija organske tvari od otprilike 95 % u vremenu od 120 s. Dobiveni rezultati ukazuju na veliki potencijal primjene istraživane metode, ne samo u analizi TOC, već i u ostalim analizama koje zahtijevaju razaranje organskih tvari u uzorku radi oslobađanja analita.

Abstract (english)

In this work, the investigation of degradation of organic compounds by sulphate radicals formed by photolysis of peroxodisulphate anions under the influence of UV radiation was carried out. The degradation of 14 organic compounds selected from the group of aliphatic acids, aromatics, heterocyclic compounds, amino acids, organic colours and highly condensed compounds such as fulvic and humic acids was studied. The experiments were conducted under the flow-through conditions that resemble the real working conditions of on-line TOC analyzers. It was shown that the rate of degradation of organic compounds by sulphate radicals is significantly faster than the rate of degradation due to the UV photolysis only. By using the flow-through UV-persoxodisulphate method, a degradation efficiency of approximately 95% was achieved for the samples with the TOC value of approximately 10 mg/L, with a residence time of samples of only 120 s. These results suggest that the studied method has a great potential for applications, not only in the analysis of TOC, but also in other analytical methods, which require the destruction of organic matter in the sample (e.g. to release analyte).

• Keywords: peroksodisulfat; UV; TOC; degradacija
• Keywords (english): peroxodisulphate; UV radiation; TOC; degradation
• Language: croatian
• URN:NBN: urn:nbn:hr:159:433184
• Study programme: Title: Upravljanje sigurnošću hrane; Study programme type: sveučilišni; Study level: diplomski; Academic / professional title: magistar/magistra inženjer/inženjerka upravljanja sigurnošću hrane (magistar/magistra inženjer/inženjerka upravljanja sigurnošću hrane)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Restricted access
• Created on: 2017-06-01 11:02:00