Summary
A catalytic method for the determination of Fe(II, III) is proposed. The method is based on the catalytic effect of Fe(III) on the color reaction ofN-phenyl-p-phenylenediamine withN,N-dimethyl-aniline in the presence of hydrogen peroxide. Fe(II) is also determined, being oxidized by hydrogen peroxide. Acetate acts as an activator for the catalytic effect of Fe(III). As little as 10−8 M of Fe(II, III) can be determined by measuring the absorbance of the reaction product (λ max=728 nm) at a fixed time after the initiation of the reaction. The method is usefull for the determination of iron in various water samples.
Zusammenfassung
Das Verfahren beruht auf der katalytischen Wirkung von Fe(III) auf die Farbreaktion vonN-Phenyl-p-phenylendiamin mitN,N-Dimethylanilin in Gegenwart von Wasserstoffperoxid. Fe(II) wird ebenfalls erfaßt, da es von H2O2 oxydiert wird. Acetat dient als Aktivator für den katalytischen Effekt von Fe(III). 10−8Mol Fe(II, III) können durch Messung des Reaktionsproduktes (λ max=728 nm) nach Ablauf einer bestimmten Zeit nach Beginn der Reaktion bestimmt werden. Das Verfahren eignet sich für die Eisenbestimmung in Wasser.
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Nakano, S., Odzu, M., Tanaka, M. et al. Catalytic determination of nanogram amounts of FE(II, III) by the oxidative coupling reaction of N-pheniyl-p-phenylenediamine with N,N-Dimethylaniline. Mikrochim Acta 79, 403–411 (1983). https://doi.org/10.1007/BF01204823
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DOI: https://doi.org/10.1007/BF01204823