Abstract
Spectrophotometric determination of beryllium by using complexation on the micelle surface has been investigated. Quaternary ammonium salt promotes the protolytic dissociation on hydroxyl group Eriochrome Cyanine R, and gives the higher order complex {molar ratio of Be (II) to ligand 1 to 2} with its absorption maximum shifted to longer wavelengths. In the presence of the quaternary ammonium salt of the concentration sufficient for micelle formation, the complex has an absorption maximum at 595 mμ with a constant absorbance in the pH range from 6.7 to 7.2. The relation between the absorbance of the complex and the concentration of beryllium is linear over the range of 0.0180.055 μg/ml, but it does not hold for the lower beryllium concentration. The effects of diverse ions are also examined. This method is the most sensitive among the spectrophotometric methods for beryllium with organic reagents.
