The paper describes a simple and sensitive spectrofluorimetric procedure for the analysis of microquantities of aluminum in drinking water for toxicological purposes. The method is based on the formation of the Al(III) – Mordant Red 19 complex, after a comparative study of the complexes formed with several compounds of the Mordant family. The emission of the fluorescent complex was measured at λ = 555 nm with excitation at λ = 475 nm. A good linearity was found in the 1 – 80 ng ml−1of aluminum range. The precision of the method was good, the intraday Relative Standard Deviation being 1.9% for a 30 ng ml−1aluminum standard solution. The procedure proved to be suitable in terms of accuracy and selectivity for the microdosage of aluminum in mineral waters.