Effect of catamin AB on spectrophotometric characteristics of the gallium (III) ions complex with eriochrome cyanine R

The effect of catamine AB on the spectrophotometric characteristics of eriochrome cyanine R complexes with gallium (III) ions is considered.Light absorption spectra of the reagent and its complexes with gallium in aqueous solutions were recorded at different pH values and amounts of surfactants.At pH values of 3.60 and 4.70, the composi-tions of complex compounds of the metal ion with the ligand in the binary system and in the presence of catamine AB were determined by saturation and isomolar series methods.Calibration graphs for gallium (III) ions determination were constructed under optimal complexation conditions, and molar absorption coefficients were calculated.The conditional stability constants of the complexes were determined using the Babko method. The influence of interfering ions on the spectrophotometric determination of gallium ions with eriochrome cyanine R was studied, and the accuracy and con-vergence of determination results in the presence of catamine AB was assessed.