Titanium determination under high-sensitivity conditions with 2-(5-chloro-2-pyridylazo)-5-dimethylaminophenol. I.

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The optimum working conditions for the complexing reactions between Ti(IV) and 2-(5-chloro-2-pyridylazo)-5-dimethylaminophenol (5.ClDMPAP) in aqueous alcoholic solutions were studied. When an ethanol solution of 5.ClDMPAP is added to a Ti(IV) aqueous solution, complex species, whose spectral and stoichiometric characteristics depend on pH, develop rapidly. The complex selected for the analytical work forms between pH 4.7 and 5.8 and has a 3:1 ligand-metal molar ratio. The complex fulfils Beer's law up to a Ti(IV) concentration of 0.7 ppm, working at λmax=580 nm. The optimum concentration range (Ringbom) was between 0.05 and 0.7 ppm of Ti(IV). The molar absorptivity at λmax=580 nm and Sandell index are 4.39×104 dm3 mol−1 cm−1 and 0.0011 μg cm−2, respectively. An absorptiometric method to determine Ti(IV) was developed and the proper ways to reduce interferences produced by some anions and cations are described. The method developed was applied to Ti(IV) determination in optical glass and ceramic materials.
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