亚水杨基—邻—氨基苯酚荧光光度法测定铍

Spectrofluorometric Determination of Beryllium with Salicylidene-o-Aminophenol in Presence of Amines and Quaternary Ammonium Salts

It is found that the fluorescence intensity of beryll-ium-salicylidene-o-aminophenol(Be-SAP) complex is increased seven fold in the presence of cetyltrimethy-lammonium bromide (CTAB),six fold in ethylenediamine (en) and nine fold in 1,3-propylenediamine(PDA). The molar ratio of Be to SAP in the complex formed is 2 to 3 and the quantum efficiency is 0.44 in PDA solution. The realtionship between fluorescence intensity (F) and themperature (t,in C) may be expressed as:F = a-3. 2t (PDA),or F = b-3.4t (en). Many foreign ion interferences may be avoided by masking with EDTA. The fluorescence intensity is linear from 5 to 500ng/mL Be. The average of six parallel determinations of beryllium in a Be-Cu alloy sample agrees reasonably well with the given value. The standard deviation of the average value is 0.004 and the RSD.,2.1%.