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Title:Razvoj in validacija metode z modificirano Bi-Cu elektrodo iz steklastega ogljika : magistrsko delo
Authors:ID Kovačec, Laura (Author)
ID Finšgar, Matjaž (Mentor) More about this mentor... New window
ID Rajh, Barbara (Comentor)
Files:.pdf MAG_Kovacec_Laura_2020.pdf (6,85 MB)
MD5: EFF3F092E283755792853E190B974B91
PID: 20.500.12556/dkum/ab1abc58-a17e-4d30-87c6-b854c578987a
 
Language:Slovenian
Work type:Master's thesis/paper
Typology:2.09 - Master's Thesis
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
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
Place of publishing:Maribor
Place of performance:Maribor
Publisher:[L. Kovačec]
Year of publishing:2020
Number of pages:XII, 61 str.
PID:20.500.12556/DKUM-75667 New window
UDC:544.6.076.32(043.2)
COBISS.SI-ID:19686659 New window
NUK URN:URN:SI:UM:DK:K7VSNYXY
Publication date in DKUM:09.06.2020
Views:1552
Downloads:191
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FKKT
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Licences

License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:12.01.2020

Secondary language

Language:English
Title:Method development and validation of a Bi-Cu modified glassy carbon electrode
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 [%]).
Keywords:electrochemistry, hevay metals, validation


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