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New chelating agents for colorimetric determination of calcium

  • Eddy Chapoteau
  • Bronislaw P. Czech
  • Wolodymyr Zazulak
Article

Abstract

Two new calcium chromoionophores2 and3 are described and their potential application to colorimetric determination of calcium is assessed. Chromogenic compound2 bears two acetic acid chelating groups and a 4-(4′-nitrophenyl)azophenol chromophore. Its complexation of Ca2+ at pH 9.0 is accompanied by a 109-nm bathochromic shift and increase in the absorptivity. Triaryl chromoionophore3 bears two phosphonic acid chelating groups and the same azophenol chromophore. Compound3 exhibits a 107-nm bathochromic shift of the absorption maximum, an increase in the absorptivity upon complexation with Ca2+, and good selectivity for Ca2+ over Mg2+ at pH 7.0. Both chromoionophores exhibit linear responses from 0 to 4×10−3 M Ca2+.

Key words

Calcium complexation chromogenic chelating agent chromoionophore 

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Copyright information

© Kluwer Academic Publishers 1995

Authors and Affiliations

  • Eddy Chapoteau
    • 1
  • Bronislaw P. Czech
    • 1
  • Wolodymyr Zazulak
    • 1
  1. 1.Diagnostics DivisionBayer Corp.TarrytownUSA

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