Studies on the Diffusion Currents for Tl (I) as Depolarizer with Dropping Mercury Electrodes of Different Geometry

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Diffusion currents of Tl (l) over an extended range of concentration (0.5 mM to 40 mM) have been recorded in 2 M NaNO₃ with a vertical, horizontal, inclined at 45° and pointed upward dropping mercury electrode. Except for horizontal d.m.e., a linear relationship is exhibited between i_d and C for the other electrodes. The diffusion current (i_d) is maximum for the capillary pointed upward and least for the horizontal d.m.e. This has been further substantiated from the record of current-time curves for single drops. The half-wave potential (E_1/2) varies with the concentration of the depolarizer. At higher concentrations irreversible character becomes pronounced.