天然水中の微量アルミニウムの分析オルトフェナントロリンによる鉄マスキング-ルモガリオンけい光法

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Lumogallion was found as a superior reagent for the fluorometric determination of aluminum in sea water [This Journal, 17, 1092 (1968)]. Up to 30 μg of F- and 1000 μg of PO43- are tolerable in this procedure. Interfering ions were Fe3+, Cu2+, Ti4+, VO3- and Ga3+; the concentration of each of these except ferric iron in sea water was negligible. Ferric iron interfered in this procedure. It was found that ο-phenanthlorine prevented interference by up to 10 μg of ferric iron. Sample water containing 0.0032 μg of aluminum was treated with 2 ml of 4% hydroxylamine hydrochloride solution. After standing for 15 min., 1 ml of 1% ο-phenanthroline solution and 0.5 ml of 0.01% lumogallion solution were added to the solution, and pH was adjusted to 5.0(CH3COONH4-CH3COOH buffer). It was heated at 80°C for 20 min., and the fluorescence intensity of the solution was measured. The method may be applied to the samples of natural water containing ≥0.05 μg of aluminum per liter.