Adsorption and Inhibition Effect of Triton X at the Mercury/Solution Interface

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The time dependence of differential capacity and that of polarographic current were observed to elucidate the adsorption behavior of Triton X. The adsorption showed a relatively ideal system of the diffusion-controlled type in which semi-infinite linear diffusion was assumed. The results from the two different observations agreed approximately. The Koryta equation was applied to obtain the maximum surface concentration Γm of Triton X in the adsorption of the monolayer. logΓm decreased linearly with increasing log\barM (mean molecular weight), the slope being ca. −1. In the case of high bulk concentration, the adsorption showed unusual phenomena considered to be caused by the formation of a multi-layer which tended to become marked with the decrease of \barM. The inhibition effect of Triton X on reduction current revealed approximately the same tendency regardless of cations Cd2+ and Cu2+. Though the dependence of inhibitive action on \barM was relatively small, the degree of inhibition became somewhat small with increasing \barM in contrast to the cases of PVP and PEG. The shape of instantaneous i vs. t curve was approximately elucidated by Matsuda's treatment of the system where the limiting current was depressed by diffusion-controlled adsorption. The i-t curve revealed that the degree of inhibition scarcely increases until attainment of a certain high coverage when a sharp increase takes place.
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