Spectrophotometric catalytic determination of Fe(III) in estuarine waters using a flow-batch system

A flow-batch system was developed for the determination of Fe(III) in estuarine waters with high variability in salinity. The method is based on the catalytic effect of iron(III) on the oxidation rate of N,N-dimethyl-p-phenylenediammonium dichloride (DmPD) by hydrogen peroxide and the formed product...

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Bibliographic Details
Published in:Analytica chimica acta 2002-03, Vol.455 (2), p.327-333
Main Authors: Carneiro, Josiane Meire Tolotti, Dias, Ana Cristi Basile, Zagatto, Elias Ayres Guidetti, Honorato, Ricardo Saldanha
Format: Article
Language:English
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Summary:A flow-batch system was developed for the determination of Fe(III) in estuarine waters with high variability in salinity. The method is based on the catalytic effect of iron(III) on the oxidation rate of N,N-dimethyl-p-phenylenediammonium dichloride (DmPD) by hydrogen peroxide and the formed product is spectrophotometrically monitored at 554 nm. A controlled addition of sodium chloride to every assayed sample is accomplished for in-line individual salinity matching. The proposed system processes about 30 samples h super(-1) and yields reproducible results. Relative standard deviations were estimated as 0.999; n=5) and the detection limit is 5 mu g l super(-1) Fe. Results are in agreement with graphite furnace atomic absorption spectrometry.
ISSN:0003-2670
DOI:10.1016/S0003-2670(01)01611-7