Fabrication and voltammetric study of lanthanum 2,6-dichlorophenolindophenol chemically modified screen printed electrodes. Application for the determination of ascorbic acid
Φόρτωση...
Ημερομηνία
Συγγραφείς
Florou, A. B.
Prodromidis, M. I.
Tzouwara-Karayanni, S. M.
Karayannis, M. I.
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
A screen printed carbon electrode (SPCE) impregnated with the electrocatalyst 2,6-dichlorophenolindophenol lanthanum salt ([DCPI](3)La) was constructed. Using cyclic voltammetry the electrochemical behaviour of SPCE, -SPEs and their catalytic effect towards ascorbic acid was investigated. A synthesis protocol ([DCPI](3)La) and some identification studies are given. The fabrication of (SPE) using a mixture of 5% (w/w) [DCPI](3)-La/graphite powder in 1 and 2% (w/v) ethyl cellulose in 2-butoxyethylacetate is also described. Constant potential amperometry in stirred solutions was used for the determination of ascorbic acid in beverages and pharmaceuticals potential of +0.1V versus Ag/AgCl, at pH 7.25 was employed. This technique was also used to assess the reproducibility of the electrode manufacture. Interference of various compounds was also studied. Good correlation with the official titrimetric method was attained. Calibration graphs were linear over the range 0.01-1 mM ascorbic acid and the RSD was 1.8% (n = 9) for 0.6 mM ascorbic acid. Recovery ranged from 91 to 103%. The [DCPI](3)-La-SPE showed very good storage and operational stability. (C) 2000 Elsevier Science B.V. All rights reserved.
Περιγραφή
Λέξεις-κλειδιά
electrochemical determination of ascorbic acid, screen printed electrodes, beverages, pharmaceuticals, [dcpi](3)-la-spe, carbon-paste electrode, cobalt phthalocyanine, electrocatalytic oxidation, amperometric determination, spectrophotometric method, electrochemical sensor, products, behavior
Θεματική κατηγορία
Παραπομπή
Σύνδεσμος
<Go to ISI>://000089924100012
http://ac.els-cdn.com/S0003267000010813/1-s2.0-S0003267000010813-main.pdf?_tid=8107990a01754baf3da3c129b2933e68&acdnat=1333037121_c686d2c0c975e5344bf546a393d7d936
http://ac.els-cdn.com/S0003267000010813/1-s2.0-S0003267000010813-main.pdf?_tid=8107990a01754baf3da3c129b2933e68&acdnat=1333037121_c686d2c0c975e5344bf546a393d7d936
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