Fluorometric determination of beryllium by the use of Schiff base complexes in the presence of amines.

WATANABE Kunihiro, AOKI Izuo

doi:10.2116/bunsekikagaku.34.8_497

In the previous studies on the determination of beryllium with salicylidene-2-aminophenol(SAPH), it has been shown that the Schiff base reacts with the metal ion to form Be-SAPH complex. In the present paper the authors have investigated the composition of Be-Schiff base complex in the presence of large amount of amine, so that SAPH reacts with amines to form another respective Schiff bases. The optimum condition were studied for the fluorometric determination of beryllium with salicylaldehyde and some of its derivatives and bissalicylidene-ethylenediamine in place of SAPH. The optimum pH range for formation of the Be-Schiff base complexes, which depends on the kind of amine, was from 8 to 12. Effects of 19 amines discussed : N, N-dimethyl-1, 3-propanediamine was superior to other amines. 2-Hydroxy-5-methylbenzaldehyde combined with N, N-dimethyl-1, 3-propanediamine was better than other couples as a reagent. The recommended procedure for the fluorometric determination of beryllium is as follows : Take a sample solution containing less than 4 μg of beryllium. Add 5 ml of a mixture (pH 10) of N, N-dimethyl-1, 3-propanediamine (10%) and hydrochloric acid. Then add 1 ml of 0.01% bis (5-methylsalicylidene) ethylenediamine methanol solution. Dilute to 25 ml with water. The fluorescence intensity at 455 nm is measured at excitation wavelength of 350 nm, in which a quinine sulfate solution is used as a reference. Accurate determination is possible in the concentration range of beryllium from 0.002 μg to 4 μg.

Fluorometric determination of beryllium by the use of Schiff base complexes in the presence of amines.

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