Pregled bibliografske jedinice broj: 965858
Electrochemical behaviour of L-cysteine on carbon paste electrode modified with silver-copper sulfides
Electrochemical behaviour of L-cysteine on carbon paste electrode modified with silver-copper sulfides // 25th YISAC 2018 Young Investigators Seminar on Analytical Chemistry / Kalcher, Kurt (ur.).
Graz: OH Graz, 2018. str. 16-16 (predavanje, međunarodna recenzija, sažetak, znanstveni)
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Naslov
Electrochemical behaviour of L-cysteine on carbon paste electrode modified with silver-copper sulfides
Autori
Krivić, Denis ; Vuko, Meri ; Buzuk, Marijo
Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni
Izvornik
25th YISAC 2018 Young Investigators Seminar on Analytical Chemistry
/ Kalcher, Kurt - Graz : OH Graz, 2018, 16-16
Skup
25th Young Investigators' Seminar on Analytical Chemistry (YISAC 2018)
Mjesto i datum
Graz, Austrija, 02.07.2018. - 05.07.2018
Vrsta sudjelovanja
Predavanje
Vrsta recenzije
Međunarodna recenzija
Ključne riječi
carbon paste ; ternary sulfides ; electrochemistry ; cysteine
Sažetak
The electrochemical behaviors of carbon paste electrodes, modified with different amounts of ternary sulphides (three different sulphides deposited at various condition), has been tested in order to determine L-cysteine by electrochemical techniques. Electrochemical processes on these modified electrodes indicate possibility of indirect determination of L-cysteine based on formation of the stable complexes of L-cysteine and metal ions released from ternary sulphides. The measurements have been conducted at two pH values (pH 5 and 7). Based on obtained preliminary results, square wave voltammetry (SWV) (both, anodic and cathodic) have been chosen as appropriate analytical tool for electrochemical determination of L-cysteine. The best results were obtained with electrode modified with 5% of ternary sulphide that contains traces of elementary silver proved by XRD analysis. The effect of various parameters on the electroanalytical signal such as: amount of electroactive material, frequency, amplitude, step potential have been investigated. Results indicate that the processes are controlled by diffusion or/and adsorption. Electrode with optimum composition (5% of modificator) show satisfactory sensibility for anodic processes at 10 Hz of 20 μA μmol-1 dm3, with the linear range from 0.1 to 1 μmol dm-3. The detection limit, determined by 3σ method was 0.0025 μmol dm-3.
Izvorni jezik
Engleski
Znanstvena područja
Kemija
Napomena
Usmeno predavanje je održao Denis Krivić kao dio prezentacije rezultata svog seminarskog rada
