Abstract
In the spectrophotometric determination of beryllium with Chromazurol S(CAS) in the presence of Zephiramine at pH 10, an increase in CAS concentration was required along with an increase in Zephiramine concentration in order to obtain the maximum and stable absorbance of the 1 : 2 mononuclear complex (the absorption maximum: 525nm). The optimum conditions for the beryllium determination were : [Zephiramine] > 5 × 10-4 mol dm-3, [CAS]/[Zephiramine] _??_(0.050.1) and pH=10.2. In the calibration curves of beryllium obtained under the optimum conditions, the beryllium concentration ranges in which Beer's law was valid increased with an increase in Zephiramine concentrations. From these results, the apparent equilibrium constant (k') between the 1 : 2 mononuclear and binuclear complexes (the absorption maximum: near 600nm) was observed with the varying concentrations of Zephiramine. The k' value varied inversely against [Zephiramine]1/2. According to these results, the reaction mechanism for the complex formation was discussed.
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