master's thesis
Nana Ivana Hrastnik (Author), Vasko Jovanovski (Mentor), Marco Bortoluzzi (Mentor)

Abstract

Monitoring and measuring heavy metals in the environment is of great importance and requires sensitive and reliable analytical techniques capable of detecting trace level concentrations. Nowadays, measurements of heavy metals are usually performed using sophisticated and expensive instrumental techniques, such as atomic absorption spectroscopy (AAS), atomic fluorescence spectroscopy (AFS), inductively coupled plasma mass spectrometry (ICP-MS), inductively coupled plasma optical emission spectroscopy (ICP-OES) etc. In this aspect, advanced electroanalytical (stripping) techniques represent a favourable alternative, facilitating sensitive and selective measurements of various analytes using relatively simple, portable and non-expensive instrumentation. This work is an investigation of novel copper-based electrodes for measuring trace levels of selected heavy metal ions, i.e. mercury(II), lead(II), tin(IV) and nickel(II). The methods of choice were anodic stripping voltammetry (ASV) in combination with the in-situ prepared copper film electrode (CuFE) for measuring low concentrations of mercury(II) and lead(II) (simultaneously) and tin(IV) in the test solutions and adsorptive cathodic stripping voltammetry (AdCSV) for determination of nickel(II). Metal-film electrodes are regularly employed in electrochemical stripping analysis due to their simple fabrication and surface regeneration. The newly developed CuFE appears to be a cheaper alternative to gold-based electrodes with several attractive electroanalytical characteristics, i.e. with low limits of detection (LOD), good repeatability and favourable linear response.

Keywords

Copper film electrode;anodic stripping voltammetry;adsorptive cathodic stripping voltammetry;heavy metals;environment.;

Data

Language: English
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UNG FZO - Faculty of Environmental Sciences
Publisher: [N. I. Hrastnik]
UDC: 54
COBISS: 4914427 Link will open in a new window
Views: 4217
Downloads: 261
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Other data

Secondary language: Slovenian
Secondary title: Določevanje težkih kovin z in-situ pripravljeno tankoslojno bakrovo elektrodo kot orodje za monitoring v okolju
Secondary abstract: Nadzorne meritve kovin v sledovih v okolju so vse pomembnejše in zahtevajo uporabo občutljivih ter zanesljivih analiznih tehnik in senzorjev. Dandanes se za merjenje kovin v sledovih večinoma uporabljajo kompleksne in drage občutljive instrumentalne tehnike, kot so atomska absorpcijska spektroskopija (AAS), atomska fluorescenčna spektroskopija (AFS), optična emisijska spektroskopija z induktivno sklopljeno plazmo (ICP-OES), masna spektrometrija z induktivno sklopljeno plazmo (ICP-MS) itd. Elektroanalizne (stripping) tehnike predstavljajo zanimivo alternativo zgoraj omenjenim tehnikam, saj omogočajo občutljivo in selektivno merjenje različnih analitov z uporabo enostavnih, prenosnih in cenejših instrumentov. V magistrskem delu je predstavljena raziskava uporabe elektrokemijskih analiznih metod na osnovi tankoslojne bakrove elektrode za določitev nizkih koncentracij dvovalentnih ionov živega srebra, svinca, kositra in niklja v testnih raztopinah ter realnem vzorcu. Na podlagi eksperimentalnih rezultatov sem v kombinaciji z in-situ pripravljeno tankoslojno bakrovo elektrodo za določitev nizkih koncentracij Hg(II) in Pb(II) sočasno v testni raztopini in za Sn(IV) uporabili anodno stripping voltametrijo ter za določitev Ni(II) adsorpcijsko katodno stripping voltametrijo. Tankoslojne kovinske elektrode se v elektrokemijski analizi običajno uporabljajo zaradi svoje preproste priprave in možnosti regeneracije elektrodne površine. Značilnost tankoslojne bakrove elektrode, v primerjavi z bolj razširjeno zlato elektrodo, je večja občutljivost, nizka meja zaznave (LOD), odlična ponovljivost merjenja in linearni odziv v širokem delovnem območju.
Secondary keywords: tankoslojna bakrova elektroda;anodna stripping voltametrija;katodna stripping voltametrija;adsorpcijska voltametrija;težke kovine;okolje;magistrske naloge;
URN: URN:SI:UNG
Type (COBISS): Master's thesis
Thesis comment: Univ. of Nova Gorica, School of Environmental Sciences and Univ. Ca' Foscari Venezia, Department of Molecular Sciences and Nanosystems
Pages: XIV, 49 str.
ID: 10863899