Spectrophotometric studies on the Al, Ga and in chelates with 5- [2-hydroxy-5-sulphophenylazo] -8-quinolinol

ABSTRACT

Trivalent ions of Al, Ga and In form colored complexes with 5 - [2-, hydroxy - 5-8 sulphaphenylazo] -8- quinolinol. The complexes were used satisfactorily for the photometric determination of the metal ions. The optimum conditions for the formation of the complexes were extensively investigated. Universal buffers of pH 6.6, 4.5 and 6.60 were used for Al, Ga and In respectively. The stoichiometry of the formed complexes and their stability constants were determined spectrophotometrically. The interference of many metal ions in the determination was also investigated. Beer's law is obeyed up to 0.67, 1.7 and 3.44 ppm metal ion. A Spectrophotometric titration of Ga with EDTA proved to be successful