m-Nitrophenylarsonic acid as a polarographic reagent for titanium

A sensitive polarographic method for titanium, based on its selective and quantitative precipitation with polarographically reducible m-mtrophenylarsonic acid is described, factors affecting the quantitative precipitation — pH, concentration, of titanium and reagent, nature and concentration of anions, and digestion — have been studied.After precipitation of the titanium under controlled conditions, the precipitate is dissolved and the polarographic diffusion current of the organic reagent is related, by a calibration, to the original titanium concentration.The method has been applied successfully to the determination of titanium in complex high temperature alloys, after the removal of iron by a mercury cathode electrolysis.