Development of chemical sensors based on low cost printed graphite electrodes modified with Nafion for the determination of iron in drinking water (Master thesis)

Παπαδοπούλου, Νάντια Α.

This work investigated the determination of iron in drinking water by using low-cost, disposable and highly reproducible graphite screen-printed electrode modified with Nafion. Nafion is a chemically inert polymer and endows to the modified electrodes a remarkable sensitivity for Fe(III) ions through their interaction with the sulfonic groups exist on polymer surface. The effect of Nafion loading on the response of the Nafion-modified electrodes was optimized and best results were obtained by applying 2 μL of 0.2% v/v Nafion in ethanol. The preconcentration of the target ions was performed in an electroless mode, under stirring, in 0.01 mol L−l HCl. Under selected conditions and for a preconcentration time of 60 s, square wave voltammograms exhibited a cathodic peak, the height of which was linearly dependent on the concentration of iron over the concentration range from 0.05 to 5.00 μmol L−l while the limit of detection (S/N 3) was found to be 15 nmol L−l Fe(III). The developed electrodes were successfully applied to the determination of iron in tap water. The accuracy of the method was evaluated with recovery experiments in spiked samples. Recovery was 108%. Possible interferences from the coexisting ions were also investigated. Results suggested that the proposed sensors are sensitive, selective, rapid and reliable and can be successfully applied to the determination of Fe(III) in water samples. In addition, this work reports on the synthesis and characterization of a new Nafion modified Fe3O4 magnetic hybrid material as well as on a new experimental set-up for the use of the afore-mentioned hybrid material to analytical applications.
Institution and School/Department of submitter: Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας
Subject classification: Ηλεκτρόδια
Keywords: Εκτυπωμένα ηλεκτρόδια μέσω πλέγματος,Εκτυπωμένα ηλεκτρόδια γραφίτη,Πολυμερική μεμβράνη,Τροποποιημένα ηλεκτρόδια,SPE,G-SPEs,Nafion,Modified electrodes
Appears in Collections:Διατριβές Μεταπτυχιακής Έρευνας (Masters)

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