Determination of dissolved aluminium by the micelle-enhanced fluorescence of its lumogallion complex

Abstract

A sensitive modification of the lumogallion fluorescence assay for aluminium is presented that exploits the 5–6-fold increase in the fluorescence intensity of the lumogallion-aluminium complex in the presence of the non-ionic detergent Triton X-100. The sensitised procedure has a detection limit of 0.02 µg l^–1 of Al (3σ) and a relative standard deviation of 5% at the 0.1 µg l^–1 of Al level. The sensitivity of the method is independent of salinity and it can be used for the determination of aluminium in both fresh and saline waters. The interference from iron experienced in the conventional lumogallion procedure is also present in the modified method, but can be masked by the addition of 1,10-phenanthroline.