Development of electroanalytical methods for detection and characterization of metal sulphide and sulphur nanoparticles in aquatic environment

Marguš, Marija (2016) Development of electroanalytical methods for detection and characterization of metal sulphide and sulphur nanoparticles in aquatic environment. Doctoral thesis, Faculty of Science > Department of Geology.

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Abstract

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.

Item Type: Thesis (Doctoral thesis)
Keywords: nanoparticles, chronoamperometry, metal sulfides, sulphur, mercury electrode, microscopy
Supervisor: Ciglenečki-Jušić, Irena and Batina, Nikola
Date: November 2016
Number of Pages: 145
Subjects: NATURAL SCIENCES > Geology
Divisions: Faculty of Science > Department of Geology
Depositing User: Danica Vujičić
Date Deposited: 28 Nov 2016 14:11
Last Modified: 28 Nov 2016 14:11
URI: http://digre.pmf.unizg.hr/id/eprint/5357

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