Abstract
A fluorometric method for the determination of trace amounts of Ga with 2-hydroxy-1-naphthaldehyde-semicarbazone (2-HNS) was applied to the analysis of aluminium metal and its alloy. To a sample solution containing less than 5.0 μg of gallium, were added 0.1% sodium fluoride solution (Ga 05.0 μg : 50 μl, Ga 01.0μg: 20 μl. Ga 00.2μg: 5 μg μl), 2 ml of 2-HNS solution in DMF (Ga 05.0 μg : 0.05%, Ga 01.0 μg : 0.025%, Ga 00.2μg: 0.01%) and 1 ml of 2 w/v% ammonium acetate solution. The pH of the solution was adjusted to 3.0+0.1 with hydrochloric acid or ammonia water, and the solution was diluted to 25 ml with water. The fluorescence intensity was measured at 450 nm (λex: 395 nm) against the standard quinine sulfate solution (10, 2 or 0.5 μg/ml). Gallium was separated from interfering elements by extracting with isopropylether, and the method was then found to be applicable to the determination of gallium above 0.1 ppm in practical samples.
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