Spectrophotometric determination of platinum

Anthranilic acid as a reagent
  • A. K. Majumdar
  • J. G. Sen Gupta


Anthranilic acid when heated on the steam bath with chloroplatinic acid at pH 5.0 gives a reddish violet complex having absorption maximum at 500 nm. The violet coloured system obeys Beer's law from 4 to 64 ppm of platinum (IV) with an optimum concentration range of 16 to 48 ppm where the per cent relative error per 1% absolute photometric error is 2.87.

Composition studies by three techniques suggest the formation by platinum(IV) of a 1∶1 complex with the reagent, and the dissociation constant of the complex is 2.6 · 10−4 only when measured at 28° C.


Colour Analytical Chemistry Platinum Steam Inorganic Chemistry 
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Copyright information

© Springer-Verlag 1960

Authors and Affiliations

  • A. K. Majumdar
    • 1
  • J. G. Sen Gupta
    • 1
  1. 1.Department of Inorganic and Analytical ChemistryJadavpur UniversityCalcutta-32India

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