IN a recent paper1 it was stated that molybdenumV1 produces in 0.5 M hydrofluoric acid -0.5 M sulphuric acid mixture two waves that can be used for analysis. The first wave results from the reduction of molybdenumV1 to molybdenumv, E, = -0.06 volt with respect to the saturated calomel electrode (E, -E, = 100 mV), and the second wave from the reduction of molybdenumV1 to molybdenumlI1, E, = -0-52 volt (E* -E, = 140 mV). With this supporting electrolyte, titanium, zirconium, niobium, tantalum and tungsten are held in true solution.M solution of molybdenumv1, 50-fold excesses of zirconium, niobiumV and tantalum, and &fold excesses of titaniumIV and tungstenV1 have no interfering effects on the first molybdenum wave.
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