selective complexmetric determination of titanum (iv) by using 5-sulphosalicylic acid as releasing agent

a complexometric method for the determination of titanium in the presence of other metal ions based on the selective masking ability of 5-sulphosalicylic acid towards titanium is described. titanium (iv) present in a given sample solution is complexed with a known excess of edta and surplus edta is titrated against zinc sulphate solution at ph 5-6 using xylenol orange as the indicator. a known excess of 10% solution of 5-sulphosalicylic acid is then added. the mixture is then shaken well and the edta released from ti-edta complex is titrated against the standard zinc sulphate solution. reproducible and accurate results are obtained for 0.96 – 28.75 mg of titanium (iv) with relative error ± 0.17% and standard deviations ≤ 0.02 mg. the interference of various ions is studied. this method was applied to the determination of titanium (iv) in its alloys.