Abstract
Tungsten(VI) does not catalyze the polarographic reduction of nitric or perchloric acid. It decreases the molybdenum-catalyzed reduction currents of these acids.This is attributed to the formation of a mixed heteropolyacid of molybdenum (VI) and tungsten (VI) which does not cause a catalytic reduction at potentials where molybdenum yields a limiting catalytic current. The molybdenum (V)-catalyzed reduction current of chloric acid is greatly enhanced by the presence of tungsten (VI) in the bulk of the solution, and the sensitivity of the polarographic molybdenum determination is increased by one order of magnitude in the presence of 2.10 −4 M tungstate in a mixture 1 M in perchloric acid and 0.5 M in sodium chlorate. It is suggested that the exaltation can be used for the determination of small concentrations of tuugsten(VI).
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