Selective Complexmetric Determination of Titanum (IV) by Using 5-Sulphosalicylic Acid as Releasing Agent

Document Type: Original research article

Authors

1 Department of Chemistry, Dr. M.V.Shetty Institute of Technology, Moodbidri, Mangalore-574225, Karnataka, India

2 Department of Chemistry, Srinivas Institute of Technology, Valachil, Mangalore- 574 143, Karnataka, India

3 Department of Chemistry, Srinivas Institute of Technology, Valachil, Mangalore- 574 143, Karnataka, India

Abstract

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.

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