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Utility of solid-phase spectrophotometry for determination of dissolved iron(II) and iron(III) using 2,3-dichloro-6-(3-carboxy-2-hydroxy-1-naphthylazo)quinoxaline
Faculty
Science
Year:
2008
Type of Publication:
Article
Pages:
1241-1245
Authors:
Gouda, Ayman A, Amin, Alaa S
DOI:
10.1016/j.talanta.2008.05,034
Journal:
TALANTA ELSEVIER SCIENCE BV
Volume:
76
Research Area:
Chemistry
ISSN
ISI:000259750800042
Keywords :
iron determination, quinoxaline azo dyes, solid-phase spectrophotometry, water analysis
Abstract:
A new simple, very sensitive, selective and accurate procedure for the determination of trace amounts of iron(II) by solid-phase spectrophotometry (SPS) has been developed. The procedure is based on fixation of iron(II) as 2,3-dichloro-6-(3-carboxy-2-hydroxy-1-naphthylazo)quinoxaline on a styrene-divinyl benzene anion-exchange resin. The absorbance of resin sorbed iron(II) complex is measured directly at 743 and 830 nm. Iron(Ill) was determined by difference measurements after reduction of iron(III) to iron(II) with hydroxylamine hydrochloride. Calibration is linear over the range 1.0-20 mu g L-1 of Fe(II) with relative standard deviation (R.S.D.) of 1.65\% (n = 10.0). The detection and quantification limits for 100 mL sample system are 280 and 950 ngL(-1) using 0.5 g of the exchanger. The molar absorptivity and Sandell sensitivity are also calculated and found to be 2.86 x 10(6) Lmol(-1) cm(-1) and 0.0196 ng cm(-2), respectively. The proposed procedure has been successfully applied to determine iron(II) and iron(Ill) in tap, mineral and well water samples. (C) 2008 Elsevier B.V. All rights reserved.
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