Solution Properties of Aluminum and Titanium Complexes with o-Chlorophenylfluorone and Competition Coordination for Selective Determination of Trace Amounts of Titanium

Abstract.

 The competition coordination for selective determination (CCSD) is described and the complexations of Ti(IV) and Al(III) with o-chlorophenylfluorone (o-CPF) is studied at pH 4.5 in presence of Triton X-100. The determination of equilibrium constants of the complexes was made by the spectral correction technique in place of ordinary spectrophotometry. The complexes are formed as [Al(o-CPF)₃]³⁻ and [Ti(o-CPF)₃]²⁻ and their stepwise and cumulative stability constants are calculated. Trace amounts of Ti can substitute Al from its o-CPF complex and the competition coordination has been used in the quantitative determination of Ti in water samples with satisfactory results.