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master's thesis
Elektrokemijska karakterizacija galne kiseline
2021. urn:nbn:hr:182:310895
Jurišić, Mirjana
Josip Juraj Strossmayer University of Osijek
Department of Chemistry
Department of General, Inorganic and Physical Chemistry and Methodology of Chemistry

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Jurišić, M. (2021). Elektrokemijska karakterizacija galne kiseline (Master's thesis). Osijek: Josip Juraj Strossmayer University of Osijek, Department of Chemistry. Retrieved from https://urn.nsk.hr/urn:nbn:hr:182:310895

Jurišić, Mirjana. "Elektrokemijska karakterizacija galne kiseline." Master's thesis, Josip Juraj Strossmayer University of Osijek, Department of Chemistry, 2021. https://urn.nsk.hr/urn:nbn:hr:182:310895

Jurišić, Mirjana. "Elektrokemijska karakterizacija galne kiseline." Master's thesis, Josip Juraj Strossmayer University of Osijek, Department of Chemistry, 2021. https://urn.nsk.hr/urn:nbn:hr:182:310895

Jurišić, M. (2021). 'Elektrokemijska karakterizacija galne kiseline', Master's thesis, Josip Juraj Strossmayer University of Osijek, Department of Chemistry, accessed 19 January 2025, https://urn.nsk.hr/urn:nbn:hr:182:310895

Jurišić M. Elektrokemijska karakterizacija galne kiseline [Master's thesis]. Osijek: Josip Juraj Strossmayer University of Osijek, Department of Chemistry; 2021 [cited 2025 January 19] Available at: https://urn.nsk.hr/urn:nbn:hr:182:310895

M. Jurišić, "Elektrokemijska karakterizacija galne kiseline", Master's thesis, Josip Juraj Strossmayer University of Osijek, Department of Chemistry, Osijek, 2021. Available at: https://urn.nsk.hr/urn:nbn:hr:182:310895

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Metadata
TitleElektrokemijska karakterizacija galne kiseline
Title (english)Electrochemical characterization of gallic acid
AuthorMirjana Jurišić
MentorMartina Medvidović-Kosanović (mentor)
MentorAnamarija Stanković (komentor)
Committee memberOlivera Galović (predsjednik povjerenstva)
Committee memberMartina Medvidović-Kosanović (član povjerenstva)
Committee memberAnamarija Stanković (član povjerenstva)
GranterJosip Juraj Strossmayer University of Osijek
Department of Chemistry
(Department of General, Inorganic and Physical Chemistry and Methodology of Chemistry)
Osijek
Defense date and country2021-12-20, Croatia
Scientific / art field,
discipline and subdiscipline		NATURAL SCIENCES
Chemistry
Physical Chemistry
Abstract
U ovom diplomskom radu ispitivana su elektrokemijska svojstva galne kiseline u različitim puferima i realnim uzorcima uporabom diferencijalne pulsne voltametrije. Vrijednosti pH pufera su varirale od pH = 3,0 do pH = 9,5. Cilj rada bio je ispitati utjecaj pH na potencijal oksidacijskog strujnog vrha galne kiseline, istražiti utjecaj koncentracije galne kiseline i brzinu promjene polarizacije elektrode na oksido-redukcijska svojstva galne kiseline, istražiti moguću adsorpciju oksidacijskog produkta galne kiseline na površinu radne elektrode te odrediti galnu kiselinu u realnim uzorcima. Elektrokemijska mjerenja provedena su u troelektrodnoj elektrokemijskoj ćeliji gdje su kao radne elektrode korištene zlatna, platinska i elektroda od staklastog ugljika, kao referentna elektroda korištena je Ag/AgCl elektroda, te kao protuelektroda korištena je platinska žica. Utvrđeno je da se galna kiselina oksidira pri navedenim eksperimentalnim uvjetima pri čemu su detektirana dva oksidacijska strujna vrha, te da dolazi do adsorpcije njenog oksidacijskog produkta na površinu elektrode. Visina oksidacijskog strujnog vrha galne kiseline je varirala s promjenom pH vrijednosti, dok je optimalna pH vrijednost za njenu oksidaciju bila oko pH = 6,0. Utvrđeno je da se oksidacijski strujni vrh galne kiseline povećava sa povećanjem koncentracije (linearna ovisnost u području od 0,1 μmol dm-3 do 66,6 μmol dm-3). Galna kiselina je detektirana u realnim uzorcima u kojima joj je koncentracija varirala od 0,4 μmol dm-3 do 35,6 μmol dm-3.
Abstract (english)
In this thesis, the electrochemical properties of gallic acid in different buffers and real samples were investigated using differential pulse voltammetry. The pH values of the buffers ranged from pH = 3.0 to pH = 9.5. The aim of this study was to investigate the influence of pH value on the potential of oxidation current peak of gallic acid, to investigate the influence of gallic acid concentration and rate of electrode polarization change on oxido-reduction properties of gallic acid, to investigate possible adsorption of the oxidation product of gallic acid on the surface of the working electrode and determine the gallic acid in real samples. Electrochemical measurements were performed in a three-electrode electrochemical cell where gold, platinum and glassy carbon electrodes were used as working electrodes, Ag / AgCl electrode was used as a reference electrode, and platinum wire was used as a counter electrode. It was found that gallic acid is oxidized under these experimental conditions, where two oxidation current peaks were detected, and its oxidation product was adsorbed on the electrode surface. The height of the oxidation current peak of gallic acid varied with the change of pH value, while the optimal pH value for its oxidation was around pH = 6.0. It was found that the oxidation current peak of gallic acid increases with increasing concentration (linear dependence in the range from 0.1 μmol dm-3 to 66.6 μmol dm-3). Gallic acid was detected in real samples in which its concentration varied from 0.4 μmol dm-3 till 35.6 μmol dm-3.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:182:310895
Study programmeTitle: Graduate University Study of Chemistry; research program; specializations in: Research program
Course: Research program
Study programme type: university
Study level: graduate
Academic / professional title: magistar/magistra kemije (magistar/magistra kemije)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Created on2022-08-03 08:32:37