Selective speciation of trace chromium through micelle-mediated preconcentration, coupled with micellar flow injection analysis-spectrofluorimetry
Φόρτωση...
Ημερομηνία
Συγγραφείς
Paleologos, E. K.
Stalikas, C. D.
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 new method based on the cloud point extraction (CPE) technique was applied for the differentiation and the selective determination of Cr species. Cr(III) reacts with 8-hydroxyquinoline (8-HQ) in a surfactant solution yielding a hydrophobic complex, which then is entrapped 'in situ' in the surfactant micelles. The Cr(VI) assay is based on its reduction to Cr(III) by sulfite which subsequently reacts with 8-HQ in a similar manner. In order to increase the sample throughput a flow injection analysis (FIA) system allied to fluorimetric detection was employed. Using a simple FIA configuration the greatest sensitivity was obtained which under the optimum working conditions, allows the reliable determination of Cr(III) and/or Cr(VI) at levels as low as 0.2 mug l(-1),in various samples even in those with complex matrix (sea water, pharmaceuticals). The whole procedure is straightforward, without any laborious, expensive and hazardous treatment and was proved to tolerate interferences among the cations and anions tested. Moreover, the analytical approach offers distinct advantages over the commonly used analytical methods especially for large number of samples with complex matrixes, which would unavoidably require arduous and delicate pretreatment. (C) 2001 Elsevier Science B.V. All rights reserved.
Περιγραφή
Λέξεις-κλειδιά
micelles, cloud point extraction, chromium speciation, 8-hydroxyquinoline, fia-spectrofluorimetry, atomic-absorption spectrometry, spectrophotometric determination, 8-hydroxyquinoline derivatives, fluorometric detection, natural-waters, extraction, separation, methodology, surfactant, complexes
Θεματική κατηγορία
Παραπομπή
Σύνδεσμος
<Go to ISI>://000169173000006
http://ac.els-cdn.com/S0003267001008844/1-s2.0-S0003267001008844-main.pdf?_tid=bfc3473711168947973389c4af317c26&acdnat=1333040874_29cb877f81683b4dad4e72bca9301e5b
http://ac.els-cdn.com/S0003267001008844/1-s2.0-S0003267001008844-main.pdf?_tid=bfc3473711168947973389c4af317c26&acdnat=1333040874_29cb877f81683b4dad4e72bca9301e5b
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