Študij vpliva ligandov na določevanje Pb, Zn in Cd v sedimentih z AAS

Maroh, Tomaž (author), Kočar, Drago (mentor)

V naprej določenemu koncentracijskemu gradientu treh težkih kovin (svinec, cink, kadmij) sem dodajal ligande (EDTA, citronska kislina in huminska kislina). Z meritvami na osnovi atomske absorpcijske spektroskopije (AAS) sem za vsako kombinacijo določil umeritveno krivuljo in njen naklon. S primerjavo naklonov sem določal vpliv dodanega liganda na določanje posamezne kovine oz. njihovi zmesi v različnih medijih (nevtralnem in kislem) na metodo za določanje teh kovin. Svinec se je izkazal za najbolj robustnega na spreminjajoče se dejavnike, medtem ko je bil kadmij najbolj podvržen spremembam naklona zaradi spreminjajočih se dejavnikov.

• Language: Slovenian
• Keywords: AAS, ligandi, težke kovine, naklon umeritvene krivulje
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FKKT - Faculty of Chemistry and Chemical Technology
• Year: 2022
• PID: 20.500.12556/RUL-139673
• COBISS.SI-ID: 126466563
• Publication date in RUL: 06.09.2022

Secondary language

• Language: English
• Title: Study of the effect of ligands on the determination of Pb, Zn and Cd in sediments with AAS

Abstract

I added ligands (EDTA, citric acid, and humic acid) in a predetermined gradient of 3 heavy metals (lead, zinc, and cadmium). The calibration curve and slope for each combination were determined using atomic absorption spectroscopy (AAS) measurements. By comparing the slopes, I studied the influence of the added ligand to the individual element solution or their mixtures in different media (neutral and acidic) on the method for determining the concentration. Lead was found to be the most resistant to factor changes, whereas cadmium was most prone to slope changes because of factor changes.

• Keywords: AAS, ligands, heavy metals, slope of the calibration curve