Determination of trace titanium in KH2PO4 by differential pulse adsorption voltammetry

A sensitive differential pulse adsorption voltammetric method for the determination of trace titanium(IV) in KH2PO4 has been studied based on the formation of the Ti(IV) complex with diphenylguanidine and 4-[(4-diethylamino-2-hydroxy-phenyl)-azo]-5-hydroxynaphthalene-2, 7-disulphonic acid (Beryllon III). The reduction peak current of the complex was proportional to the concentration of Ti(IV) in the range 7.3 × 10−10−1.2 × 10−7 mol/l. The detection limit of 1.7 × 10−10 mol/l can be obtained under optimum experimental conditions. The method was applied to the determination of trace Ti(IV) in KH2PO4 with satisfactory results.