[Study on fluorescent properties and application of the new reagent DCOBAQS with aluminium]

A new fluorometric method is reported for the determination of aluminium, based on the complex forming of 7-[(2,4-dicarboxymethyl-5-carboxybenezene)azo]-8-hydroxyquinoline-5-sulfonic (DCOBAQS) with aluminium. The complex was formed at pH 5.54 with lambda ex/lambda em = 510 nm/572 nm. A better line relationship curve was obtained over the range of 0-0.04 microgram.mL-1 Al(III), and the detection limit for Al(III) is 0.557 ng.mL-1. The method is applied to determination aluminium in tea with satisfactory results.