Flow injection-assisted optical sensor for determination of iron (II) and iron (III) in natural water

  1. Lopes Da Conceição, A.C. 1
  2. Tena, M.T. 2
  3. Correia Dos Santos, M.M. 1
  4. Simões Gonçalves, M.L. 1
  5. Luque De Castro, M.D. 2
  1. 1 Universidade de Lisboa
    info

    Universidade de Lisboa

    Lisboa, Portugal

    ROR https://ror.org/01c27hj86

  2. 2 Universidad de Córdoba
    info

    Universidad de Córdoba

    Córdoba, España

    ROR https://ror.org/05yc77b46

Revista:
Analytica Chimica Acta

ISSN: 0003-2670

Año de publicación: 1997

Volumen: 343

Número: 3

Páginas: 191-197

Tipo: Artículo

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DOI: 10.1016/S0003-2670(96)00595-8 SCOPUS: 2-s2.0-0031009396 GOOGLE SCHOLAR

Otras publicaciones en: Analytica Chimica Acta

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Resumen

An approach for speciation of iron (as Fe(II) and Fe(III)) based on integration of retention of the Fe(III)-SCN complex with detection using a conventional spectrophotometer is proposed here. The device (namely, a flow-cell packed with an exchange resin) has been coupled to a flow-injection manifold with inner-coupled injection valves which enables discrimination between Fe(III) and Fe(II) taking advantage of a redox minicolumn housed in the loop of one of the valves. The method thus proposed has good selectivity with a determination limit of 80 μgl-1 and affords a determination range of 80-500 μgl-1 for Fe(II) plus Fe(III). Application to synthetic and real samples containing both the oxidation states of iron lead to average recoveries of 103% and 101% for Fe(II) and total iron (Fe(II)+Fe(III)), respectively, thus showing the usefulness of the overall approach.