The ferrozine method revisited: Fe(II)/Fe(III) determination in natural waters

The original ferrozine method has been modified to sequentially determine the Fe(II)/Fe(III) speciation in small volumes of fresh and marine water samples, at the submicromolar level. Spectrophotometric analyses of the Fe(II)–ferrozine complex are performed on a single aliquot before and after a red...

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Bibliographic Details
Published in:Applied geochemistry 2000-07, Vol.15 (6), p.785-790
Main Authors: Viollier, E, Inglett, P.W, Hunter, K, Roychoudhury, A.N, Van Cappellen, P
Format: Article
Language:English
Subjects:
Earth sciences
Earth, ocean, space
Exact sciences and technology
Ferrozine
Fresh and marine water
Geochemistry
Hydrology
Hydrology. Hydrogeology
Iron speciation
Marine geology
Mineralogy
Silicates
Spectrophotometry
Water geochemistry
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Summary:The original ferrozine method has been modified to sequentially determine the Fe(II)/Fe(III) speciation in small volumes of fresh and marine water samples, at the submicromolar level. Spectrophotometric analyses of the Fe(II)–ferrozine complex are performed on a single aliquot before and after a reduction step with hydroxylamine. The procedure is calibrated using Fe(III) standards stable under normal conditions of analysis. It is shown also that the presence of high concentrations of dissolved NOM (natural organic matter) do not create any significant artifacts. The method was used to measure Fe(II) and Fe(III) depth distribution in salt marsh pore waters and in a stratified marine basin.
ISSN:0883-2927
1872-9134
DOI:10.1016/S0883-2927(99)00097-9