Razvoj elektroanalitičkih metoda za određivanje i karakterizaciju nanočestica metalnih sulfida i elementarnog sumpora u vodenom okolišu

doctoral thesis

• Title (english): Development of electroanalytical methods for detection and characterization of metal sulfide and sulphur nanoparticles in aquatic environment
• Author: Marija Marguš; MBZ: 326502
• Mentor: Irena Ciglenečki-Jušić (mentor)
• Mentor: Nikola Batina (komentor); MBZ: 84233
• Committee member: Dario Omanović (predsjednik povjerenstva)
• Committee member: Suzana Šegota (član povjerenstva); MBZ: 201740
• Committee member: Tajana Preočanin (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Geology); Zagreb
• Defense date and country: 2016-11-18, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Interdisciplinary Natural Sciences; Marine Science
• Universal decimal classification (UDC): 55 - Geology. Meteorology. Hydrology

Abstract

Fizikalno-kemijska svojstva nanočestica (NČ), prvenstveno visoka reaktivnost, utječe na biodostupnost i sudbinu NČ u vodenom okolišu. Ovaj rad opisuje primjenu elektroanalitičkih metoda u određivanju i karakterizaciji NČ. Kronoamperometrijskim (CA) i voltametrijskim mjerenjima su detektirane NČ metalnih sulfida (MeS) i elementarnog sumpora (So) u modelnim sustavima. Na osnovu primijenjenog potencijala živine elektrode (Hg) određena je vrsta NČ MeS. Naboj detektiranih šiljastih signala u CA ovisi o dijametru NČ, dok frekvencija udara ovisi o udjelu NČ s dijametrom manjim od 200 nm. S CA je praćen proces aglomeriranja u ovisnosti o primijenjenim eksperimentalnim uvjetima. Kako bi se potvrdila elektroanalitička mjerenja na Hg elektrodi, provedena su mjerenja pri istim eksperimentalnim uvjetima metodama koje se standardno koriste u karakterizaciji NČ (DLS, NTA, AFM i EC-STM). Razvijena CA metoda je primijenjena za detekciju NČ u prirodnim euksiničnim vodenim sustavima.

Abstract (english)

Physico-chemical properties of nanoparticles (NPs), mainly high reactivity, affect their bioavailability and fate in aquatic environment. This work shows development of electroanalytical methods in detection and characterization of NPs. Chronoamperometry (CA) and voltammetry were used for detection of the metal sulphide (MeS) and sulphur (So) NPs in modal solutions. Based on the applied potential of the working mercury electrode (Hg) it is possible to differentiate between MeS NPs. The charge of recorded spike like signals is related to NPs size, while signal frequency depends on the presence of the NPs smaller than 200 nm. With use of CA agglomeration processes under different experimental conditions were monitored. In order to confirm electrochemical measurements in parallel intercomparison measurements with methods used in the characterization of NPs (STM, AFM, DLS, NTA) were done under same experimental conditions. CA was applied in detection of the NPs in natural aquatic euxinic systems.

• Keywords: nanočestice; kronoamperometrija; metalni sulfidi; sumpor; živina elektroda; mikroskopija
• Keywords (english): nanoparticles; chronoamperometry; metal sulfides; sulphur; mercury electrode; microscopy
• Language: croatian
• URN:NBN: urn:nbn:hr:217:379389
• Study programme: Title: Interdisciplinary doctoral study in Oceanology; Study programme type: university; Study level: postgraduate; Academic / professional title: doktor/doktorica znanosti, područje prirodnih znanosti, polje interdisciplinarne prirodne znanosti (znanost o moru) (doktor/doktorica znanosti, područje prirodnih znanosti, polje interdisciplinarne prirodne znanosti (znanost o moru))
• Type of resource: Text
• Extent: 145 str. ; 30cm
• File origin: Born digital
• Access conditions: Open access
• Public note: Ovaj doktorski rad izrađen je u Laboratoriju za fiziku mora i kemiju vodenih sustava (bivši Laboratorij za fizičku kemiju vodenih sustava) Zavoda za istraživanje mora i okoliša Instituta Ruđer Bošković u Zagrebu, pod vodstvom dr.sc. Irene Ciglenečki-Jušić, te u Laboratoriju za nanotehnologiju i molekularno inženjerstvo, Universidad Autónoma Metropolitana-Iztapalapa, Meksiko, pod vodstvom prof.dr.sc. Nikole Batine. Istraživanja u okviru ovog rada bila su financirana slijedećim projektima: UKF projekt „Nanoparticles in aqueous environment: electrochemical, nanogravimetric, STM and AFM studies“ (UKF grant 62/10); HRZZ projekt „Sulphur and carbon dynamics in the marine and freshwater environment“ (IP-11-2013-1205, SPHERE); COST akcija ES1205 „Engineered Nanomaterials (ENMs) from wastewater treatment & stormwater to rivers”.
• Created on: 2017-11-20 11:36:08