Solution properties of aluminum and titanium complexes with o-chlorophenylfluorone and competition coordination for selective determination of trace amounts of titanium

摘要

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 presnece of Triton X-100. The determination of equilibrium constnats 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 constnats 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.