Extraction concentrating of tungsten (VI) in complex form with 2-Hydroxy-5-Tret-Butylphenol-4´-Methyl-Azobenzene and Its determination by atomic-absorption spectrometry

Abstract

Complexation of tungsten (VI) with azo-compound synthesized with para-tret-butylphenol (2-hydroxy-5-tret-butylphenol-4´-methyl-azobenzene) was studied by using spectrophotometric method. Spectrophotometric characteristics of the complex were calculated, composition of the complex was determined by different techniques. Stability constant of the complex (lgKуст=4.2•1010), as well as equilibrium constant of the complexation reaction (3.2•104) were calculated by using Komar method. Molar absorption coefficient equals to (2.1±0.1).104. Calibration curve is linear at concentrations of tungsten 1.0–10 mkg/ml.