Kinetic method for determination of molybdenum(6) and tungsten(6) from oxidaton of O-aminophenol with hydrogen peroxide

A new method for determination of Mo(6) and W(6), based on the oxidation of O-aminophenol with hydrogen peroxide, catalysed by Mo and W(6) ions, is suggested. The reaction takes place in the neutral medium at a rather high substrate concentrations. The 1.5 M acetate buffer solution, 0.2N EDTA and 0.1M solution of O-aminophenol in 0.1M HCl were suggested for determination of Mo (0.2N EDTA was used for Fe(3) camouflage). The 1.5M acetate buffer solution with 0.3M K2C2O4xH2O additions, for Fe(3) and Mo(6) camouflage, and 0.1M O-aminophenol solution in 0.1M solution of H2C2O4xH2O were used for tungsten determination. The range for Mo and W determination is 3x10-3 and 1x10-2 mkg/ml respectively. The range of Mo and W concentrations under determination is from 3x10-3-10-2 to 2 mkg/ml. The techniques for the analysis of highly pure substances is developed