All-solid-state potentiometric sensors for ascorbic acid by using a screen-printed compatible solid contact
Φόρτωση...
Ημερομηνία
Συγγραφείς
Veltsistas, P. G.
Prodromidis, M. I.
Efstathiou, C. E.
Τίτλος Εφημερίδας
Περιοδικό ISSN
Τίτλος τόμου
Εκδότης
Elsevier
Περίληψη
Τύπος
Είδος δημοσίευσης σε συνέδριο
Είδος περιοδικού
peer reviewed
Είδος εκπαιδευτικού υλικού
Όνομα συνεδρίου
Όνομα περιοδικού
Analytica Chimica Acta
Όνομα βιβλίου
Σειρά βιβλίου
Έκδοση βιβλίου
Συμπληρωματικός/δευτερεύων τίτλος
Περιγραφή
The development of all-solid-state potentiometric ion selective electrodes for monitoring of ascorbic acid, by using a screen-printed compatible solid contact is described. The applied methodology is based on the use of PVC membrane modified with some firstly-tested ionophores (triphenyltin(IV)chloride, triphenyltin(IV)hydroxide and palmitoyl-L-ascorbic acid) and a novel one synthesized in our laboratory (dibutyltin(IV) diascorbate). Synthesis protocol and some preliminary identification studies are given. A conductive graphite-based polymer thick film ink was used as an internal solid contact between the graphite electrode and the PVC membrane. The presence and the nature of the solid contact (plain or doped with lanthanum 2,6-dichlorophenolindophenol (DCPI)) seem to enhance the analytical performance of the electrodes in terms of sensitivity, dynamic range, and response time. The analytical performance of the constructed electrodes was evaluated with potentiometry, constant-current chronopotentiometry and electrochemical impedance spectroscopy (EIS). The interference effect of various compounds was also tested. The potential response of the optimized Ph3SnCl-based electrode was linear against ascorbic acid concentration range 0.005-5.0 mM. The applicability of the proposed sensors in real samples was also tested. The detection limit was 0.002mM ascorbic acid (50mM phosphate, pH 5 in 50mM KCl). The slope of the electrodes was super-Nernstian and pH dependent, indicating a mechanism involving a combination of charge transfer and ion exchange processes. Fabrication of screen-printed ascorbate ISEs has also been demonstrated. (C) 2003 Elsevier B.V. All rights reserved.
Περιγραφή
Λέξεις-κλειδιά
screen-printed compatible solid contact, all-solid-state ise, ascorbic acid, potentiometry, poly(vinyl chloride) membrane, modified platinum-electrode, ion-selective electrodes, electrocatalytic oxidation, vitamin-c, spectrophotometric method, phthalocyanine, construction, 2,6-dichlorophenolindophenol, copper(ii)
Θεματική κατηγορία
Παραπομπή
Σύνδεσμος
<Go to ISI>://000187731200003
http://ac.els-cdn.com/S0003267003013047/1-s2.0-S0003267003013047-main.pdf?_tid=5c11eed6a956a9ddc6b31e8c3cab2f1e&acdnat=1333037449_25dda46eb4ff9248440a8c12f88c284c
http://ac.els-cdn.com/S0003267003013047/1-s2.0-S0003267003013047-main.pdf?_tid=5c11eed6a956a9ddc6b31e8c3cab2f1e&acdnat=1333037449_25dda46eb4ff9248440a8c12f88c284c
Γλώσσα
en
Εκδίδον τμήμα/τομέας
Όνομα επιβλέποντος
Εξεταστική επιτροπή
Γενική Περιγραφή / Σχόλια
Ίδρυμα και Σχολή/Τμήμα του υποβάλλοντος
Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας