LAboratoire de Spectrochimie Infrarouge et Raman – UMR 8516
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Seminar of Dr Marija Margus

Ruder Boskovic Institute, Division for Marine and Environmental Research, Croatia
Development of an electrochemical method for detection and characterization of metal sulfide nanoparticles (MeS) in the aquatic environment

The dramatic changes in physical and chemical characteristics that particles at nano scale undergoes when arriving in the natural environment and their potential risks for the (eco)community is the major reason for such huge scientific interest in the study of nanoparticles (NPs). Physico-chemical properties of nanoparticles (NPs), mainly high reactivity, affect their bioavailability and fate in aquatic environment. This work shows development of electroanalytical methods for 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.

The seminar will be held on 2017.04.25 at 14:30
LASIR meeting room, basement building C5