VOLTAMMETRIC DETERMINATION OF ALUMINUM IN HEMODIALYSIS CONCENTRATES USING THE ADSORPTION OF THE AL(III)-1,2-DIHYDROXYANTRAQUINONE-3-SULFONIC ACID COMPLEX IN PRESENCE OF CALCIUM

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