Highly selective spectrophotometric determination of trace cobalt and development of a reagentless fiber-optic sensor

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dc.contributor.authorPaleologos, E. K.en
dc.contributor.authorProdromidis, M. I.en
dc.contributor.authorGiokas, D. L.en
dc.contributor.authorPappas, A. C.en
dc.contributor.authorKarayannis, M. I.en
dc.date.accessioned2015-11-24T16:38:57Z
dc.date.available2015-11-24T16:38:57Z
dc.identifier.issn0003-2670-
dc.identifier.urihttps://olympias.lib.uoi.gr/jspui/handle/123456789/8106
dc.rightsDefault Licence-
dc.subjectcobalten
dc.subjectspectrophotometryen
dc.subjectpanen
dc.subjectfiber-optic sensoren
dc.subjectcentral composite designen
dc.subjectwastewateren
dc.subjectpharmaceuticalsen
dc.subjectalloysen
dc.subjectatomic-absorption spectrometryen
dc.subjectcathodic stripping voltammetryen
dc.subjectcloud point extractionen
dc.subjectflow-injectionen
dc.subjectnickelen
dc.subjectseawateren
dc.subjectcopperen
dc.subjectpreconcentrationen
dc.subjectsamplesen
dc.subjectwatersen
dc.titleHighly selective spectrophotometric determination of trace cobalt and development of a reagentless fiber-optic sensoren
heal.abstractA 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.en
heal.accesscampus-
heal.fullTextAvailabilityTRUE-
heal.identifier.secondary<Go to ISI>://000177899000022-
heal.identifier.secondaryhttp://ac.els-cdn.com/S0003267002000946/1-s2.0-S0003267002000946-main.pdf?_tid=55b40adef11ac077a4ee31c8cfec477d&acdnat=1333037226_b5b4de54e4b5895afd64df62b8f92baa-
heal.journalNameAnalytica Chimica Actaen
heal.journalTypepeer reviewed-
heal.languageen-
heal.publicationDate2002-
heal.publisherElsevieren
heal.recordProviderΠανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείαςel
heal.typejournalArticle-
heal.type.elΆρθρο Περιοδικούel
heal.type.enJournal articleen

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