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  5. Άρθρα σε επιστημονικά περιοδικά ( Ανοικτά). ΧΗΜ
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Please use this identifier to cite or link to this item: https://olympias.lib.uoi.gr/jspui/handle/123456789/9221
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dc.contributor.authorPaleologos, E. K.en
dc.contributor.authorLafis, S. I.en
dc.contributor.authorTzouwara-Karayanni, S. M.en
dc.contributor.authorKarayannis, M. I.en
dc.date.accessioned2015-11-24T16:47:41Z-
dc.date.available2015-11-24T16:47:41Z-
dc.identifier.issn0003-2654-
dc.identifier.urihttps://olympias.lib.uoi.gr/jspui/handle/123456789/9221-
dc.rightsDefault Licence-
dc.subjectflow injectionen
dc.subjectfluorimetryen
dc.subjectchromium speciationen
dc.subject2-(alpha-pyridyl)thioquinaldinamideen
dc.subjecton-line oxidationen
dc.subjectinorganic trace analysisen
dc.subjectchromium(vi)en
dc.subjectoxidationen
dc.subjectsedimentsen
dc.subjectkineticsen
dc.subjectreagenten
dc.subjectgreeceen
dc.subjectsoilsen
dc.subjectlevelen
dc.titleSpeciation analysis of Cr-III-Cr-VI using flow injection analysis with fluorimetric detectionen
heal.typejournalArticle-
heal.type.enJournal articleen
heal.type.elΆρθρο Περιοδικούel
heal.identifier.secondary<Go to ISI>://000073658900042-
heal.identifier.secondaryhttp://pubs.rsc.org/en/content/articlepdf/1998/an/a707927c-
heal.languageen-
heal.accesscampus-
heal.recordProviderΠανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείαςel
heal.publicationDate1998-
heal.abstractA relatively simple, sensitive, selective, automatic fluorimetric method for the simultaneous determination of chromium(III) and chromium(vr) by flow injection analysis (FIA) was developed, The method is based on the selective oxidation of the non-fluorescing reagent 2-(alpha-pyridyl)thioquinaldinamide (PTQA), which with Cr-VI yields an intensely fluorescent product (lambda(ex) = 360 nm; lambda(em) = 300 nm), Chromium(III) is oxidized on-line to Cr-VI with sodium metaperiodate and the Cr-VI is subsequently treated with PTQA, Fluorescence due to the sum of Cr-III and Cr-VI is measured and Cr-III is determined from the difference in fluorescence values. The effects of various analytical parameters, such as acidity, flow rate, sample volume, temperature, reagent concentration and interfering species, were studied. Kinetic studies using both the stopped-flow technique and the FIA procedure were utilized in order to study and optimise the oxidation conditions for Cr-III On th, basis of its oxidation efficiency. The calibration graphs were rectilinear in the ranges 0.1-10 mu g ml(-1) for Cr-VI and 0.1-1.0 mu g ml(-1) for Cr-III, The method was successfully verified by performing recovery experiments of Cr in several standard reference materials (peach leaves, sediments and tea), and it was applied to the speciation analysis of Cr-III-Cr-VI in environmental waters (mineral, tap and distilled water), a food sample (tomato juice) and synthetic mixtures. Up to 30 samples per hour can be analyzed with a relative standard deviation of about 0.1-2%.en
heal.journalNameAnalysten
heal.journalTypepeer reviewed-
heal.fullTextAvailabilityTRUE-
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