Voltammetric determination of aluminium in haemodialysis concentrates using the adsorption of the Al (III)-1,2-dihydroxyantraquinone-3-sulphonic acid complex in presence of calcium.

Abstract

This paper describes a method for the quantitative determination of aluminium in haemodialysis concentrates, based on the adsorption on a static mercury drop electrode of the Al-1,2 dihydroxyantraquinone-3-sulphonic acid complex. The signal was notably increased in presence of calcium. The electrolysis was carried out at-0.900 V. After 60sec the aluminium contents were measured by differential pulse voltammetry. In these conditions aluminium can be determined in the range 0.65 - 30ng/ml with a detection limit (3Ó) of 0.20 ng/ml. The relative standard deviation was in all instances less than 2.1%.