20.500.12556/DKUM-75667 Razvoj in validacija metode z modificirano Bi-Cu elektrodo iz steklastega ogljika magistrsko delo Method development and validation of a Bi-Cu modified glassy carbon electrode 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. 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 [%]). elektrokemija težke kovine validacija electrochemistry hevay metals validation true true false [L. Kovačec] Slovenski jezik Angleški jezik Magistrsko delo/naloga 2020-01-12 13:45:28 2020-06-09 10:35:59 2022-08-09 11:37:11 2020-06-18 03:10:07 2020 0 Maribor 0 Maribor XII, 61 str. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 544.6.076.32(043.2) 19686659 URN:SI:UM:DK:K7VSNYXY MAG_Kovacec_Laura_2020.pdf MAG_Kovacec_Laura_2020.pdf 1 EFF3F092E283755792853E190B974B91 3ccca252f21b129c2d023ce9ce686e7e4fba539912a11aeb22649cfa620bb7eb 3fd4383e-7c11-11eb-bb7a-00155d0001ca 20.500.12556/dkum/ab1abc58-a17e-4d30-87c6-b854c578987a https://dk.um.si/Dokument.php?lang=slv&id=141012 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0