A Comparative Spectrophotometric Study Using Ferrozine and 1,10-<i>Ortho</i>-phenanthroline to Evaluate the Iron Redox Ratio (Fe<sup>2+</sup>/ΣFe) in Glass Prepared by Microwave Heating

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  • MANDAL Biswajit
    Glass Division, CSIR-Central Glass and Ceramic Research Institute
  • SINHA Prasanta Kumar
    Materials Characterization and Instrumentation Division, CSIR-Central Glass and Ceramic Research Institute
  • SEN Ranjan
    Glass Division, CSIR-Central Glass and Ceramic Research Institute
  • MANDAL Ashis Kumar
    Glass Division, CSIR-Central Glass and Ceramic Research Institute

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  • A Comparative Spectrophotometric Study Using Ferrozine and 1,10-Ortho-phenanthroline to Evaluate the Iron Redox Ratio (Fe²⁺/ΣFe) in Glass Prepared by Microwave Heating

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In the present study, Fe-doped barium borosilicate glass has been melted at 1250°C under microwave heating. The iron redox ratio (Fe2+/total Fe) in the glass is investigated by two spectrophotometric methods. A novel decomposition technique has been optimized to measure the ferrous oxidation state in glass. Ferrozine was chosen as a specific complexing reagent; it forms a deep violet color complex with Fe2+ and has a broad absorbance peak centered at ∼562 nm. 1,10-ortho-phenanthroline develops an orange color complex with Fe2+ (having an absorbance peak centered at ∼510 nm) and has been used to determine ferrous ion in glass. Both the methods are compared and the estimated redox ratio was found to be higher in the ferrozine method. The error limit of measurement has been determined as 0.012 and 0.023 for the ferrozine and 1,10-ortho-phenanthroline methods, respectively.

Journal

  • Analytical Sciences

    Analytical Sciences 32 (5), 571-576, 2016

    The Japan Society for Analytical Chemistry

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