magistrsko delo
Laura Kovačec (Author), Matjaž Finšgar (Mentor), Barbara Petovar (Co-mentor)

Abstract

V magistrskem delu je predstavljena delna validacija metod z modificiranimi elektrodami kombinacij Bi-Cu na steklastem ogljiku za določanje Zn(II), Cd(II) in Pb(II). Analize smo izvajali z elektrokemijsko tehniko square wave anodno striping voltametrijo (SWASV). Dvanajst različnih elektrod smo pripravili in situ pri dveh različnih skupnih masnih koncentracijah Bi(III) in Cu(II) ter njunih različnih razmerjih v raztopini. Za vsako in situ elektrodo so bila določena območja linearnega odziva za Zn(II), Cd(II) in Pb(II), ki so morala zadoščati dvema kriterijema linearnosti: koeficientu kvalitete, QC (QC ≤ 5 %), in kvadratu korelacijskega koeficienta, R2 (R2 ≥ 0,995). Mejo zaznavnosti (LOD) in mejo določljivosti (LOQ) smo določili s pomočjo razmerja signal/šum, občutljivost pa iz naklonov umeritvene premice. Iz izkoristka pri določeni koncentraciji Zn(II), Cd(II) in Pb(II) smo določili točnost, natančnost metode in sistema pa smo določili na podlagi relativnega standardnega odmika v odstotkih (RSD [%]). Izmed vseh in situ elektrod smo na koncu izbrali dve: eno z najboljšo točnostjo (izkoristkom najbližje 100,0 %) in eno z najboljšo natančnostjo (najnižjim RSD [%]). Na obeh smo preučili vpliv interferenc in izvedli test realnega vzorca.

Keywords

elektrokemija;težke kovine;validacija;magistrske naloge;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UM FKKT - Faculty of Chemistry and Chemical Engineering
Publisher: [L. Kovačec]
UDC: 544.6.076.32(043.2)
COBISS: 19686659 Link will open in a new window
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Downloads: 138
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Other data

Secondary language: English
Secondary title: Method development and validation of a Bi-Cu modified glassy carbon electrode
Secondary abstract: In this master's thesis, a partial method validation with modified Bi-Cu electrodes on glassy carbon was performed for the determination of Zn(II), Cd(II) and Pb(II). Analyses were performed with an electrochemical technique square-wave anodic stripping voltammetry (SWASV). Twelve electrodes were designed in situ, at two different total mass concentrations of Bi(III) and Cu(II) and their different ratios in the solution. For every in situ electrode, a linearity for Zn(II), Cd(II) and Pb(II) were determined, which had to meet the two criteria of linearity: the quality coefficient QC had to be ≤ 5,0 % and the square of the correlation coefficient R2 had to be ≥ 0,995. Limit of detection (LOD) and limit of quantification (LOQ) were determined based on the signal-to-noise ratio, while sensitivity was determined using calibration plot slopes. Recovery at a given concentration of Zn(II), Cd(II) and Pb(II) was used to determine accuracy, while precision of the method and the system was determined on the basis of percentage relative standard deviation (RSD [%]). Among the in situ electrodes tested, two were selected to test interference effect and real sample analysis: one with the highest accuracy (recovery closest to 100,0 %) and one with the highest precision (lowest RSD [%]).
Secondary keywords: electrochemistry;hevay metals;validation;
Type (COBISS): Master's thesis/paper
Thesis comment: Univ. v Mariboru, Fak. za kemijo in kemijsko tehnologijo
Pages: XII, 61 str.
ID: 11366847