Study of the titanium-phenylfluorone complex formed in the presence of Triton X-305 and emulsifier OP

A highly sensitive method for the spectrophotometric determination of titanium with phenylfluorone (PF) in the presence of Triton X-305 and emulsifier OP has been developed. In acid medium (pH 1.4-2.2) Ti(IV) forms red-violet complexes with PF, Triton X-305 and OP. The complex exhibits maximum absorption at 540 nm. The molar absorptivity is 1.63 x 10(5) 1.mole(-1).cm(-1). The Ti:PF ratio in the complex is 1:2. Beer's law is obeyed in the titanium concentration range 0-0.2 microg/ml in the final solution. Fluoride and EDTA interfere. The method has been used for the rapid direct determination of microamounts of Ti(IV) in soils and cereals with satisfactory results.