prikaz prve stranice dokumenta RAZVOJ ELEKTROKEMIJSKE METODE ZA PRAĆENJE POLISULFIDA (Sx2-) U MORSKOM EUKSINSKOM OKOLIŠU
Embargo period 2025-11-01
doctoral thesis
RAZVOJ ELEKTROKEMIJSKE METODE ZA PRAĆENJE POLISULFIDA (Sx2-) U MORSKOM EUKSINSKOM OKOLIŠU
Zagreb: University of Zagreb, Faculty of Science, 2024. urn:nbn:hr:217:884041
Mateša Đureković, Sarah
University of Zagreb
Faculty of Science
Department of Geology

Institutional repository: Repository of the Faculty of Science

Cite this document

Mateša Đureković, S. (2024). RAZVOJ ELEKTROKEMIJSKE METODE ZA PRAĆENJE POLISULFIDA (Sx2-) U MORSKOM EUKSINSKOM OKOLIŠU (Doctoral thesis). Zagreb: University of Zagreb, Faculty of Science. Retrieved from https://urn.nsk.hr/urn:nbn:hr:217:884041

Mateša Đureković, Sarah. "RAZVOJ ELEKTROKEMIJSKE METODE ZA PRAĆENJE POLISULFIDA (Sx2-) U MORSKOM EUKSINSKOM OKOLIŠU." Doctoral thesis, University of Zagreb, Faculty of Science, 2024. https://urn.nsk.hr/urn:nbn:hr:217:884041

Mateša Đureković, Sarah. "RAZVOJ ELEKTROKEMIJSKE METODE ZA PRAĆENJE POLISULFIDA (Sx2-) U MORSKOM EUKSINSKOM OKOLIŠU." Doctoral thesis, University of Zagreb, Faculty of Science, 2024. https://urn.nsk.hr/urn:nbn:hr:217:884041

Mateša Đureković, S. (2024). 'RAZVOJ ELEKTROKEMIJSKE METODE ZA PRAĆENJE POLISULFIDA (Sx2-) U MORSKOM EUKSINSKOM OKOLIŠU', Doctoral thesis, University of Zagreb, Faculty of Science, accessed 28 March 2025, https://urn.nsk.hr/urn:nbn:hr:217:884041

Mateša Đureković S. RAZVOJ ELEKTROKEMIJSKE METODE ZA PRAĆENJE POLISULFIDA (Sx2-) U MORSKOM EUKSINSKOM OKOLIŠU [Doctoral thesis]. Zagreb: University of Zagreb, Faculty of Science; 2024 [cited 2025 March 28] Available at: https://urn.nsk.hr/urn:nbn:hr:217:884041

S. Mateša Đureković, "RAZVOJ ELEKTROKEMIJSKE METODE ZA PRAĆENJE POLISULFIDA (Sx2-) U MORSKOM EUKSINSKOM OKOLIŠU", Doctoral thesis, University of Zagreb, Faculty of Science, Zagreb, 2024. Available at: https://urn.nsk.hr/urn:nbn:hr:217:884041

Metadata
TitleRAZVOJ ELEKTROKEMIJSKE METODE ZA PRAĆENJE POLISULFIDA (Sx2-) U MORSKOM EUKSINSKOM OKOLIŠU
Title (english)DEVELOPMENT OF AN ELECTROCHEMICAL METHOD FOR MONITORING POLYSULFIDES (Sx2-) IN MARINE EUXINIC ENVIRONMENT
AuthorSarah Mateša Đureković
MentorIrena Ciglenečki-Jušić (mentor)
Committee memberZrinka Ljubešić (predsjednik povjerenstva)
Committee memberDario Omanović (član povjerenstva)
Committee memberSuzana Šegota (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Science
(Department of Geology)
Zagreb
Defense date and country2024-10-25, Croatia
Scientific / art field,
discipline and subdiscipline		NATURAL SCIENCES
Interdisciplinary Natural Sciences
Marine Science
Universal decimal classification
(UDC)		55 - Geology. Meteorology. Hydrology
Abstract
Direktno analitičko određivanje polisulfida (Sx2-) u vodenim otopinama predstavlja izazov zbog niskih konstanti termodinamičke stabilnosti Sx2-. S ciljem razvoja i primjene direktne metode za određivanje i karakterizaciju Sx2-, istraživano je njihovo elektrokemijsko ponašanje na živinoj (Hg) elektrodi. Morski euksinski okoliš Rogozničkoga jezera – Zmajeva oka (RJ) izabran je kao model za ispitivanje elektroanalitičke metode (EM), difercijalno pulsne voltametrije (DPV) za direktno određivanje... More polisulfida u prirodnim uvjetima. Za praćenje reduciranih sumpornih specija (RSS), odnosno Sx2- uz DPV, korištene su i ciklička voltametrija (CV) i stepenasta DC voltametrija/polarografija (SDC), ali i druge analitičke metode: UV/Vis spektrofotometrija za dodatno određivanje Sx2-, te mikroskopija atomskih sila (eng. atomic forced microscopy, AFM) i dinamičko raspršenje svjetlosti (eng. dynamic light scattering, DLS) za praćenje promjene svojstava RSS. AFM-om je praćena promjena morfologije stanica fototrofnih sumpornih bakterija kao izvora elementarnog S pri različitim okolišnim i eksperimentalnim uvjetima, dok je s DLS praćena promjena hidrodinamičkog radijusa elementarnog S u različitim uvjetima razrjeđenja. DPV metodom određeni su Sx2- u modelnim otopinama, te u RJ s najvećim koncentracijama u uzorcima ispod kemokline. Praćenjem sezonske dinamike Sx2- pokazano je kako njihova prisutnost i koncentracija ovise o fizikalno – kemijskim i mikrobiološkim čimbenicima. Najveće koncentracije, do 89 μM polisulfidnog S0, određene su tijekom ljeta za vrijeme izraženije raslojenosti vodenog stupca i intenzivnije mikrobiološke aktivnosti kada su dominirale ljubičaste sumporne bakterije (eng. purple sulfur bacteria, PSB), dok tijekom slabije raslojenosti i pojave holomiksije, Sx2- nisu detektirani. Less
Abstract (english)
The direct analytical determination of polysulfide (Sx2-) in seawater solutions is a challenge due to the low thermodynamic stability constants of Sx2-. To develop and apply a direct method for determining and characterizing Sx2-, its electrochemical behavior was investigated at a mercury (Hg) electrode. The marine euxinic environment of Lake Rogoznica – Zmajevo oko (RL) was chosen as a model for testing the electroanalytical method (EM), differential pulse voltammetry (DPV) for the direct... More determination of polysulfides under natural conditions. In addition to DPV, cyclic voltammetry (CV) and sampled DC voltammetry/polarography (SDC) were also used to monitor reduced sulfur species (RSS), i.e. Sx2-, as well as other analytical methods: UV/Vis spectrophotometry for additional determination of Sx2- and atomic force microscopy (AFM) and dynamic light scattering (DLS) to monitor changes in RSS properties. The change in cell morphology of phototrophic sulfur bacteria as a source of elemental S under different environmental and experimental conditions was monitored by AFM, while DLS monitored the change in hydrodynamic properties of elemental S under different dilution conditions. The DPV method was used to determine Sx2- in model solutions and the RL water column, with the highest concentrations measured in samples below the chemocline. The observation of the seasonal dynamics of Sx2- showed that its presence and concentration depend on physico-chemical and microbiological factors. The highest concentrations, up to 89 μM polysulfide S0, were determined in summer during pronounced stratification of the water column and intense microbial activity when purple sulfur bacteria (PSB) predominate, while Sx2- was not detected during periods of weak stratification and occurrence of holomixia. Less
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:217:884041
Promotion2025
ProjectNumber: IP-2018-01-1717
Title: Rogozničko morsko jezero kao model odziva ekosustava na promjene u okolišu
Acronym: MARRES
Leader: Irena Ciglenečki-Jušić
Jurisdiction: Croatia
Funder: Hrvatska zaklada za znanost
Funding stream: Research Projects
Study programmeTitle: DOCTORAL STUDY OF OCEANOLOGY
Study programme type: university
Study level: postgraduate
Academic / professional title: doktor/doktorica znanosti u području prirodnih znanosti (doktor/doktorica znanosti u području prirodnih znanosti)
Type of resourceText
Extent138 str., 30 cm
File originBorn digital
Access conditionsEmbargoed access
Embargo expiration date: 2025-11-01
Terms of useLicence In copyright icon
Created on2025-01-30 08:06:00
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