20.500.12556/DKUM-70920 Razvoj in validacija modificirane Bi-Sn elektrode Development and validation of a Bi-Sn electrode Magistrsko delo prikazuje študijo delne validacije elektroanalizne metode z in situ modificirano bizmut-kositrovo elektrodo iz steklastega ogljika za analizo težkih kovin Zn(II), Cd(II) in Pb(II) v sledovih. Analizo smo izvajali s tehniko square-wave anodne striping voltametrije (SWASV), reverzibilnost sistema pa smo preverili s pomočjo ciklične voltametrije (CV) za analizo kalijevega heksacianoferata. Pri validaciji smo izvedli določitev meje zaznavnosti (LOD) in meje določljivosti (LOQ) za 12 modificiranih Bi-Sn-elektrod iz steklastega ogljika z različnimi koncentracijskimi sestavami Bi(III) in Sn(II). Kasneje smo določili območja linearnosti za Zn(II), Cd(II) in Pb(II) z uporabo vsake izmed dvanajstih elektrod posebej. Preverili smo točnost in ponovljivost elektrod s pomočjo t-testa in izračuna RSD. Ugotovljeno je bilo, da je najbolj optimalna elektroda tista, za katero smo pri njeni in situ pripravi uporabili 0,5 mg L–1 Bi(III) in Sn(II) v razmerju 0,4 : 0,6. S pomočjo te elektrode smo preučili vpliv interferenc na izbrane analite – Zn(II), Cd(II) in Pb(II) ter izmerili dva realna vzorca. This master's thesis presents a partial validation study of an electroanalytic method of in situ plated bismuth-tin-film modified glassy carbon electrode for the trace analysis of Zn(II), Cd(II) and Pb(II) heavy metals. The analysis was carried out using square-wave anodic stripping voltammetry (SWASV) technique and the reversibility of the system was checked by cyclic voltammetry (CV) using potassium hexacyanoferrate system. The validation began with determination of the detection limit (LOD) and the quantification limit (LOQ) for 12 modified Bi(III)-Sn(II)-film glassy carbon electrodes with different concentration ratios of Bi(III) and Sn(II), followed by method's linearity determination. We validated the accuracy and reproducibility of electrodes using t-test and RSD values. The results have shown that the most optimal electrode is the one for which 0.5 mg L-1 Bi (III) and Sn (II) with the 0.4:0.6 ratio was used in its in situ plating solution. Using this electrode we studied the influence of interferences on selected analytes - Zn (II), Cd (II), and Pb (II), and used the method for two real samples. elektrokemija voltametrija elektroda iz steklastega ogljika Bi-Sn modificirana elektroda iz steklastega ogljika validacija analizne metode electrochemistry voltammetry glassy carbon electrode Bi-Sn modified glassy carbon electrode validation of the analytical method true true false [K. Vodopivec] Slovenski jezik Angleški jezik Magistrsko delo/naloga 2018-06-19 17:22:15 2018-09-10 14:14:57 2022-08-01 19:59:53 2019-07-11 18:24:12 2018 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 542.87:543.55(043.2) 21794070 URN:SI:UM:DK:5SE7NQKR MAG_Vodopivec_Katja_2018.pdf MAG_Vodopivec_Katja_2018.pdf 1 0CAEBE6BAB287001D277FE4DD5BB88F6 0162968616c1dcd17599983bcafb15f0faf3b475974ede725d4847799b5f548b 45ae3c1c-7c10-11eb-bb7a-00155d0001ca 20.500.12556/dkum/f253d2db-80f4-46b8-b6c8-5f8cbc061526 https://dk.um.si/Dokument.php?lang=slv&id=128904 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0