Extractive analysis of aluminum traces in dialysis solutions

A very sensitive procedure for the fluorimetric determination of aluminum traces in dialysis solutions by means of Mordant Red 19 dyestuff is described with the extraction of the Al complex in isobutylmethylketone. The experimental conditions were studied, in order to obtain the best extraction yield. The emission intensity of the metal chelate, extracted in the organic layer, was measured at 549 nm, exciting at 485 nm. Linearity between emission intensity and Al concentration was found in the 1-30 ng/ml range. The limit of detection was 0.25 ng/ml. The method resulted to be suitable for the determination of Al traces in commercial dialysis solutions for toxicological purposes.