A novel method for the filterless preconcentration of iron

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    Abstract

    A novel method of analysis of iron by filterless preconcentration is presented. This is the first example of efficient preconcentration of a refractory transition metal where coprecipitation and columns were omitted. The method applies a manifold of flow injection analysis (FIA) to iron species that are preconcentrated on the inner walls of a tubular reactor. It was found that the adsorption of iron species to the walls was particularly pronounced in reactors of nylon material and enrichment factors of 30-35 could be attained, as dependent on the length of the reactor and on the time of preconcentration. In the preconcentration step of the FIA accessory, the optimum efficacy was obtained when the acidity of the samples was adjusted by HCl to pH = 2.5 whereas the ammonia preconcentration buffer should be kept alkaline at pH = 9.8. After being preconcentrated on the tubular reactor, the iron species were eluted by hydrochloric acid and analysed by flame atomic absorption spectrometry (FAAS). An unprecedented low limit of detection (LOD, 3σ) of 1.8 μg L -1 was thus obtained for the analysis of iron by FAAS, and the calibration line was linear up to 100 μg L -1. A high sampling frequency of 40 per hour was obtained and the protocol allowed analysis of small amounts of iron in drinking water, in digested samples and in saline water. The major influence of interferences originated from ligands that are known to complex strongly to iron species. The method thus developed was uncomplicated in operation and it exhibited an excellent long-term stability and a high selectivity. Further, it was environmentally safe owing to production of non-toxic waste disposals. Equally high enrichment factors (EF) were obtained for Fe(II) and Fe(III), which is explained by the very low solubility product of both species.

    Original languageEnglish
    Pages (from-to)385-390
    Number of pages6
    JournalAnalyst
    Volume130
    Issue number3
    DOIs
    Publication statusPublished - Mar 2005

    Fingerprint

    Iron
    iron
    Flow Injection Analysis
    Atomic absorption spectrometry
    spectrometry
    Spectrum Analysis
    Refractory metals
    Hydrochloric Acid
    Saline water
    Nylons
    Accessories
    transition element
    hydrochloric acid
    Hydrochloric acid
    Coprecipitation
    method
    Ammonia
    Acidity
    Potable water
    Drinking Water

    All Science Journal Classification (ASJC) codes

    • Analytical Chemistry

    Cite this

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    abstract = "A novel method of analysis of iron by filterless preconcentration is presented. This is the first example of efficient preconcentration of a refractory transition metal where coprecipitation and columns were omitted. The method applies a manifold of flow injection analysis (FIA) to iron species that are preconcentrated on the inner walls of a tubular reactor. It was found that the adsorption of iron species to the walls was particularly pronounced in reactors of nylon material and enrichment factors of 30-35 could be attained, as dependent on the length of the reactor and on the time of preconcentration. In the preconcentration step of the FIA accessory, the optimum efficacy was obtained when the acidity of the samples was adjusted by HCl to pH = 2.5 whereas the ammonia preconcentration buffer should be kept alkaline at pH = 9.8. After being preconcentrated on the tubular reactor, the iron species were eluted by hydrochloric acid and analysed by flame atomic absorption spectrometry (FAAS). An unprecedented low limit of detection (LOD, 3σ) of 1.8 μg L -1 was thus obtained for the analysis of iron by FAAS, and the calibration line was linear up to 100 μg L -1. A high sampling frequency of 40 per hour was obtained and the protocol allowed analysis of small amounts of iron in drinking water, in digested samples and in saline water. The major influence of interferences originated from ligands that are known to complex strongly to iron species. The method thus developed was uncomplicated in operation and it exhibited an excellent long-term stability and a high selectivity. Further, it was environmentally safe owing to production of non-toxic waste disposals. Equally high enrichment factors (EF) were obtained for Fe(II) and Fe(III), which is explained by the very low solubility product of both species.",
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    A novel method for the filterless preconcentration of iron. / Andersen, Jens E T.

    In: Analyst, Vol. 130, No. 3, 03.2005, p. 385-390.

    Research output: Contribution to journalArticle

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