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A new reductimetric reagent: Iron (II) in acetic acid medium and in presence of pyrophosphate. Spectrophotometric titration of some oxazine dyes

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Abstract

Iron(II) in acetic acid medium and the presence of pyrophosphate is used as a new reductimetric reagent and utilised for the spectrophotometric titration of microgram quantities of six oxazine dyes. All these dyes are rapidly and quantitatively reduced to their colourless leuco-bases in a 2-electron reduction with iron(II), provided the medium contains 1 or 3M acetic acid (depending on the dye) and at least 0.1M pyrophosphate. The redox potentials of the iron(III)/iron(II) couple at different pyrophosphate and acetic acid concentrations have been measured and a method for purification of some of the commercially impure oxazine dyes is suggested.

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Authors and Affiliations

  1. Department of Engineering Chemistry, College of Engineering, Andhra University, Visakhapatnam, India

    K. Vijaya Raju, G. Madhu Gautam & G. Bangar Raju

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  1. K. Vijaya Raju
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  2. G. Madhu Gautam
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  3. G. Bangar Raju
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Raju, K.V., Gautam, G.M. & Raju, G.B. A new reductimetric reagent: Iron (II) in acetic acid medium and in presence of pyrophosphate. Spectrophotometric titration of some oxazine dyes. Mikrochim Acta 108, 265–273 (1992). https://doi.org/10.1007/BF01242436

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  • DOI: https://doi.org/10.1007/BF01242436

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