Determination of aluminum in drinking waters by a.c. oscillopolarography using solochrome violet RS

A very simple and reliable electroanalytical method for the determination o f aluminum in drinking waters by a.c. oscillopolarography using solochrome violet RS is described in this paper. In the buffer solution of 0.1 mol dm( -3) NaAc-0.5 mol dm(-3) KCI (pH 5.2) containing 7 x 10(-4) mol dm(-3) SVRS, a sensitive incision due to the redox reaction of Al-SVRS complex adsorpti on wave on the Hg-film electrode was observed on the dE/dt - E oscillogram. The incision depth was linearly proportional to the Al concentration in th e range of 5 x 10(-7) -6 x 10(-5) mol dm(-3) and was used to determine Al q uantitatively. The experimental conditions were optimized. No serious inter ference was found. The detection limit of this method was 2 x 10(-7) mol dm (-3) and the relative standard deviation was 2.2 % for 5 x 10-5 mol dm(-3) Al (n = 10). This method was successfully applied to the analysis of Al in real water samples and the results obtained by the proposed method were fou nd to be in good agreement with the results obtained by the ICP-AES method.