The double wave tended to disappear with increasing water concentration, and at intermediate peroxide concentrations it was either absent or the first wave was very poorly developed as the water concentration approached 30% of the total volume. The reason for the double wave was unclear, but it appeared likely that slow diffusion of the reduction products from the region of the dropping electrode may have been responsible since even vigorous mixing for several seconds was often insufficient to prevent layering when additions were made to the glycol solutions. In fact, a fairly persistent "streamer" due to the passage of the mercury droplet through the solutions could be visualized by adding a small amount of a dye to the more concentrated glycol solutions. A rotating microelectrode might have been superior to the dropping electrode in the media used.
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