Speciation of Fe(II) and Fe(III) by the modified ferrozine method, FIA-spectrophotometry, and flame AAS after cloud-point extraction
Φόρτωση...
Ημερομηνία
Συγγραφείς
Giokas, D. L.
Paleologos, E. K.
Karayannis, M. I.
Τίτλος Εφημερίδας
Περιοδικό ISSN
Τίτλος τόμου
Εκδότης
Springer Verlag (Germany)
Περίληψη
Τύπος
Είδος δημοσίευσης σε συνέδριο
Είδος περιοδικού
peer reviewed
Είδος εκπαιδευτικού υλικού
Όνομα συνεδρίου
Όνομα περιοδικού
Anal Bioanal Chem
Όνομα βιβλίου
Σειρά βιβλίου
Έκδοση βιβλίου
Συμπληρωματικός/δευτερεύων τίτλος
Περιγραφή
A method has been developed for the simultaneous determination of traces of Fe(III) and Fe(II) in water by on-line coupling of spectrophotometry with flame atomic absorption spectrometry (FAAS). The method involves cloud-point extraction (CPE) of both species with ammonium pyrrolidinecarbodithioate (APDC) under standard conditions, which facilitates the in situ complexation and extraction of both species. Differentiation of the oxidation states of iron is achieved by using mathematical equations to overcome the interference of Fe(Ill) in the spectrophotometric determination of Fe(Il) when they are both present in the same solution. In this manner the time-consuming and labor-intensive steps of preoxidation of Fe(II) or reduction of Fe(III) are eliminated. By preconcentrating a 10-mL sample solution detection limits as low as 7 mug L-1, were obtained after a single-step extraction procedure. The relative standard deviation (n=4, 30 mug L-1) was 2.6% and 1.8% for spectrophotometry and FAAS, respectively. Recoveries in the range of 96-105% were obtained by analysis of spiked real samples. The method was further verified by analyzing a certified reference material (IMEP-9); for this the recovery was 98.5%.
Περιγραφή
Λέξεις-κλειδιά
iron speciation, cloud-point extraction, ferrozine method, spectrophotometry, atomic absorption spectrometry, flow-injection analysis, atomic-absorption spectrometry, plasma-mass spectrometry, iron speciation, environmental-samples, coastal rainwater, water samples, preconcentration, iron(iii), seawater
Θεματική κατηγορία
Παραπομπή
Σύνδεσμος
<Go to ISI>://000177145000007
http://download.springer.com/static/pdf/380/art%253A10.1007%252Fs00216-002-1326-7.pdf?auth66=1381906175_494ad5993a55f82c99b34b0a1f40a49c&ext=.pdf
http://download.springer.com/static/pdf/380/art%253A10.1007%252Fs00216-002-1326-7.pdf?auth66=1381906175_494ad5993a55f82c99b34b0a1f40a49c&ext=.pdf
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