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Optical Thin-Film Sensors for the Determination of Aqueous Halide Ions

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Abstract

Fourteen thin-film optical sensors in which halide-sensitive fluorophores are immobilized in a thin copolymer film (≍50 μm, dry) have been developed and characterized. The sensor films use rhodamine, 6-methoxyquinoline, and harmane dyes which have been functionalized and bound to a hydrophilic copolymer. The sensor films are reversibly capable of determining aqueous bromide and iodide with ≍4 and 2% accuracy, respectively, at concentrations of around 10−3 mol dm−3, and are more sensitive than previous plastic sensor fabrications. The 90% response time to molar iodide is ≍30–60 s. A combination of sensor films allows the simultaneous determination of both I− and Br− in a mixed-halide solution. The interference of several ions, including pseudo-halides, on the sensor films has been studied.

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Authors and Affiliations

  1. Department of Chemistry, The University of Wales Swansea, Singleton Park, Swansea, South Wales, SA2 8PP, UK

    Chris D. Geddes & Peter Douglas

  2. Department of Physics and Applied Physics, The University of Strathclyde, Glasgow, G4 ONG, UK

    Chris D. Geddes

  3. Kodak Ltd., Headstone Drive, Harrow, Middlesex, HA1 4TY, UK

    Christopher P. Moore, Trevor J. Wear & Peter L. Egerton

Authors
  1. Chris D. Geddes
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  2. Peter Douglas
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  3. Christopher P. Moore
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  4. Trevor J. Wear
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  5. Peter L. Egerton
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Geddes, C.D., Douglas, P., Moore, C.P. et al. Optical Thin-Film Sensors for the Determination of Aqueous Halide Ions. Journal of Fluorescence 9, 163–171 (1999). https://doi.org/10.1023/A:1022502131091

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