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contributor.advisorPalleschi, Giuseppe-
contributor.authorBiagiotti, Vanessa-
description20. cicloen
description.abstractThe research activity of this PhD thesis was focused on the assembling of amperometric sensors to detect important chemical pollutants in drinking waters, such as ammonia and nitrites. Selected monomers were used to modify electrodes by synthetizing polymer films (via electrochemical polymerization), nanotubule nets (using a “template synthesis” approach) and nanowires (via chemical oxidation). These polymers were morphologically investigated to evaluate their characteristics suitable to assemble sensors. These last were then analitically characterized in terms of detection limit, sensitivity, reproducibility and stability. Real samples of drinking and mineral waters were analyzed and recovery studies were carried out. The first chapters of this thesis describe the main characteristics of chemically modified electrodes and polymers, including the electrochemical techniques used. The experimental section is divided in two different chapters describing the sensors developed for the detection of nitrites and ammonia, respectively.en
description.tableofcontentsIntroduction - Chapter I: Chemically modified electrodes - 1.1 Approaches to modify electrodes - 1.2 Phenomena occurring at CMEs - Chapter II: Polymers - 2.1 Polymer structur and properties - 2.2 Polymer characterization - 2.3 Polymer degradation - 2.4 Polymer from aromatic diamines - 2.5 Nanopolymers - Chapter III: Electrochemical techniques - 3.1 Cyclic Voltammetry - 3.2 Amperometric methods - 3.3 Flow injection analysis (FIA) - References. - EXPERIMENTAL SECTION. Chapter IV: Detection of nitrite in drinking water using chemically modified electrodes by polymeric films and nanotubule nets - 1 Introduction - 2 Experimental - 2.1 Reagents and solutions - 2.2 Apparatus - 2.3 Procedure - 3 Results and discussio - 3.1 Study of permeability - 3.2 Study of permselectivity - 3.3 Morphological characterization - 3.4 FIA procedure - 3.5 Stability studies - 3.6 Recovery study - 4 Conclusion - References. - Chapter V: Detection of ammonia in drinking water using chemically modified electrodes by polypyrrole films and nanowires - 1 Introduction - 2 Experimental - 2.1 Reagents and solutions - 2.2 Apparatus - 2.3 Procedure - 3 Results and discussion - 3.1 Microstructured polypyrrole modified electrode characterization - 3.2 Polypyrrole nanowires modified electrode characterization - 3.3 Analytical results - 3.4 Stability study - 3.5 Real sample analysis - 4 Conclusions - Reference - General conclusions - Communications and articlesen
format.extent2402459 bytes-
subject.classificationCHIM/01 Chimica analiticaen
titleStudy of amperometric sensors for the determination of nitrite and ammonia in drinking wateren
typeDoctoral thesisen
degree.nameDottorato in scienze chimicheen
degree.disciplineFacoltà di Scienze Matematiche Fisiche e Naturalien
degree.grantorUniversità degli studi di Roma Tor Vergataen
date.dateofdefenseA.A. 2007/2008en
Appears in Collections:Tesi di dottorato in scienze matematiche e fisiche

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