An electrochemical sensor for trace uranium determination based on 6-O-palmitoyl-L-ascorbic acid-modified graphite electrodes
Φόρτωση...
Ημερομηνία
Συγγραφείς
Dimovasilis, P. A.
Prodromidis, 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
Sensors and Actuators B-Chemical
Όνομα βιβλίου
Σειρά βιβλίου
Έκδοση βιβλίου
Συμπληρωματικός/δευτερεύων τίτλος
Περιγραφή
The development of a preconcentrating sensor based on 6-O-palmitoyl-L-ascorbic acid (PAA)-modified graphite (GRA) electrodes for the determination of uranium is described. PM, a water insoluble compound of ascorbic acid, was immobilized onto the surface of the GRA electrodes through physical adsorption from acetone solutions. Uranium was accumulated by heterogeneous complexation (10 min, in 0.1 M H(3)BO(3), pH 4.3) and then, it was reduced by means of a differential pulse voltammetric scan in 0.1 M H(3)BO(3), pH 3.4. Alternatively, the performance of both preconcentration and voltammetric steps in a single run, at 0.1 M H(3)BO(3), pH 3.65, was also examined; however, in this case the observed current signals were lower by 30%. The experimental variables were investigated and under the selected conditions, a linear calibration curve in the range 2.7-67.5 mu g L(-1) U(VI) was constructed (r(2) = 0.9981). The 3 sigma limit of detection and the relative standard deviation of the method were 1.8 mu g L(-1) U(VI) and 8% (n = 5, 20 mu g L(-1) U(VI), preconcentration time 10 min), respectively. By increasing the preconcentration time to 30 min, a limit of detection as low as 0.26 mu g L(-1) U(VI) can be achieved. The effect of potential interferences was also examined. The accuracy of the method was established by recovery studies in inoculated tap and lake water samples. A simple and fast procedure based on filtering of the sample through a C-18 microcolumn was successfully used to remove the organic matter from the lake water samples. (C) 2011 Elsevier B.V. All rights reserved.
Περιγραφή
Λέξεις-κλειδιά
electrochemical sensor, uranium detection, chemically modified electrodes, stripping voltammetric determination, carbon-paste electrode, bismuth-film electrode, ascorbic-acid, spectrophotometric determination, cupferron complex, ion, spectrometry, oxidation, behavior
Θεματική κατηγορία
Παραπομπή
Σύνδεσμος
<Go to ISI>://000292354600027
http://ac.els-cdn.com/S0925400511001304/1-s2.0-S0925400511001304-main.pdf?_tid=178c13a7978125253f879f01e05bff93&acdnat=1333037080_fab805ad72f125690adb9d9b28416344
http://ac.els-cdn.com/S0925400511001304/1-s2.0-S0925400511001304-main.pdf?_tid=178c13a7978125253f879f01e05bff93&acdnat=1333037080_fab805ad72f125690adb9d9b28416344
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