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Nickel(II), cobalt(II), and uranium(VI) were studied polarographically to determine the effect of uv-visible irradiation on their reduction characteristics. Photoeffects were observed in all cases. Two mechanisms are proposed for the nickel photokinetic prewave, and the complex photoeffects observed with cobalt and uranium are described. Proposals are made for further studies to clarify and elucidate the photochemical reactions and to apply this technique in the study of the activated states of ions prior to reduction.