Spectrophotometric studies of Al [III] complexes with 4- [arylazo] -1-hydroxy-2-naphtoic acid dyes

ABSTRACT

The optimum conditions favoring the formation of Al [III] complexes with 4-arylazo-1-hydroxy-2-naphthoic acid dyes [Ia-h] are extensively investigated. The molecular structure of the complexes and their obedience to Beer's law and Ringbom ranges, as well as, their stabilities are studied. Methods for the spectrophotometric determination of Al [III] and spectrophotometric titration using EDTA and CDTA were reported. The interference effect of several ions was checked. The stoichiometry of Al [III] with [Ia-h] dyes was investigated by conductometric titrations. The study was extended to the determination of Al in pure Al metal and in Si-Al master alloy. A new rapid and accurate method for the spectrophotometric microdetermination of Al [III] using 4-[arylazo]-1-hydroxy-2-naphthoic acid dyes [Ia-h] is given