Highly selective spectrophotometric determination of trace cobalt and development of a reagentless fiber-optic sensor
Φόρτωση...
Ημερομηνία
Συγγραφείς
Paleologos, E. K.
Prodromidis, M. I.
Giokas, D. L.
Pappas, A. C.
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 highly selective spectrophotometric method for the determination of trace cobalt based upon the reaction of cobalt(III) with 1-(2-pyridylazo)-2-naphthol (PAN) in the presence of peroxodisulfate is described. Following an experimental design procedure based on a central composite design (CCD) method and a specifically orientated univariate optimization, it was found that an alkaline media of pH = 11 and controlled peroxodisulfate concentration are crucial factors for enhancing the formation and aqueous solubility of the Co(III)-PAN chelate. Immobilization of PAN into a cellulose acetate membrane was also investigated leading to the construction of a reagentless fiber-optic sensor. According to the proposed reaction mechanism dissolved Co(II) is easily oxidized to Co(III) by peroxodisulfate and then readily complexed with PAN, either in solution or on the membrane surface giving a unique absorbance peak at 645-650 nm. Linear calibration graphs over the concentration range 0.02-0.5 mg l(-1) with a 3sigma limit of detection of 0.01 and 0.1-2 mg l(-1) with a limit of detection of 0.07 mg l(-1) were obtained by applying the photometric method and the fiber-optic sensor, respectively. Excellent agreement with the reference atomic absorption spectrometric method was achieved when the proposed methodology was applied for the determination of cobalt in various samples of industrial, environmental and biological importance. (C) 2002 Elsevier Science B.V. All rights reserved.
Περιγραφή
Λέξεις-κλειδιά
cobalt, spectrophotometry, pan, fiber-optic sensor, central composite design, wastewater, pharmaceuticals, alloys, atomic-absorption spectrometry, cathodic stripping voltammetry, cloud point extraction, flow-injection, nickel, seawater, copper, preconcentration, samples, waters
Θεματική κατηγορία
Παραπομπή
Σύνδεσμος
<Go to ISI>://000177899000022
http://ac.els-cdn.com/S0003267002000946/1-s2.0-S0003267002000946-main.pdf?_tid=55b40adef11ac077a4ee31c8cfec477d&acdnat=1333037226_b5b4de54e4b5895afd64df62b8f92baa
http://ac.els-cdn.com/S0003267002000946/1-s2.0-S0003267002000946-main.pdf?_tid=55b40adef11ac077a4ee31c8cfec477d&acdnat=1333037226_b5b4de54e4b5895afd64df62b8f92baa
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