Beta-correction spectrophotometric investigation of aluminium complex solution with new ligand, dibromo-<i>o</i>-nitrophenylfluorone

Abstract

The new ligand, dibromo-<i>o</i>-nitrophenylfluorone (DBNPF) was found to sensitively complex aluminium (Al³⁺) at <i>p</i>H<i> </i>8.5. The ordinary spectrophotometry was limited for use because of the serious interference of excess of DBNPF. The β-correction<i> </i>theory was applied to the analysis of this reaction instead of the single wavelength spectrophotometry. It gave the

simple determination of the complex characteristic factors. Results showed that the formed complex can be expressed as Al(DBNPF)₅ at <i>p</i>H<i> </i>8.5, the cumulative stability constant of complex equaled to 1.48×10²⁰. For analysis of water samples, the detection limit of aluminium was 0.005 mg/L and the recoveries vary between 92.0 and 108% with the relative standard deviations less than 4.4%.