Spectrophotometric determination of trace uranium(VI) as a mixed ligand complex with 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol and aromatic carboxylic acid

  • S. Abe
  • M. Takahashi
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Abstract

Spectrophotometric studies on a uranium(VI) ternary complex and its analytical application are described. Uranium(VI) reacts with 5-Br-PADAP to form an unstable chelate, which precipitates on standing in 48% ethanolic aqueous solution. The colour stability of uranium(VI) complex is greatly improved by the presence of aromatic carboxylic acids. For the present purpose, o-hydroxybenzoic acid and its derivatives are best suited. The calibration graph is linear up to 2.6 μg·ml−1 of uranium(VI) at 578 nm. The role of carboxylic acid as an auxiliary ligand is discussed.

Keywords

Colour Aqueous Solution Uranium Carboxylic Acid Present Purpose 
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Copyright information

© Akadémiai Kiadó 1985

Authors and Affiliations

  • S. Abe
    • 1
  • M. Takahashi
    • 1
  1. 1.Department of Applied ChemistryYamagata UniversityYonezawaJapan

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