STUDY ON THE COMPLEXATION OF Y(III) WITH REAGENT 4-(3-METHYL-2-PYRIDYLAZO) RESORCINOL BY SPECTROPHOTOMETRIC METHOD

Abstract

The complexation of Y(III) with 4-(3-methyl- 2-pyridylazo) resorcinol (3-Met-PAR) has been investigated by spectrophotometric method. The Y(III)-(3-Met-PAR) colour complex, with the composition 1:2, is formed most favourably at pH = 9.0÷11.0 and has the absorption maximum wavelength at 495 nm whereas that of 3-Met-PAR is at 414 nm. The mechanism of complexation has been studied, the parameters of complexation have been found with molar absorption coefficient ε = (1.0±0.1)x104 l.cm-1.mol-1, lgKp = 5.9±0.2 and lgβ = 22.2±0.3. It has been shown that the complex of Y(III)-(3-Met-PAR) is stable with time in accordance with the Lambert - Beer’s law in a rather large limit interval.