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Arsenazo, 2-(4-arsonophenyl(azo-7-(4-antipyril)azo-1,8-dihydroxy-3,6-naphtalene disulphonic acid as reagent for calcium ions. New parameters for metallochromic indicator characterization

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Abstract

Ca(II) ions react with arsenazo, 2-(4-arsonophenyl)-azo-7-(4-antipyril)azo-l,8-dihydroxy-3,5-naphtalene disulphonic acid, at pH 10.0 to produce a blue complex, with stoichiometry 1∶1, and stability constant of 6.64×105. Its molar absorptivity is 3.78×1041·mol−1 cm−1. This reagent has been used as metallochromic indicator in the complexometric titration of Ca. Its colour transition has been specified by tristimulus colourimetry. New parameters are defined and compared to Ringbom's parameters.

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Authors and Affiliations

  1. Department of Analytical Chemistry, Faculty of Sciences, University of Zaragoza, E-50009, Zaragoza, Spain

    J. Cacho Palomar, A. López Molinero & M. Ibañez

Authors
  1. J. Cacho Palomar
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  2. A. López Molinero
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  3. M. Ibañez
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Cacho Palomar, J., López Molinero, A. & Ibañez, M. Arsenazo, 2-(4-arsonophenyl(azo-7-(4-antipyril)azo-1,8-dihydroxy-3,6-naphtalene disulphonic acid as reagent for calcium ions. New parameters for metallochromic indicator characterization. Mikrochim Acta 88, 73–85 (1986). https://doi.org/10.1007/BF01196689

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  • DOI: https://doi.org/10.1007/BF01196689

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