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- W2022184861 abstract "The various factors which affect limiting currents at the rotated dropping mercury electrode (RDME) are reviewed. The current at the RDME in the absence of surface active substances involves maxima of the second kind, even under conditions where these maxima are not observed at the conventional dropping mercury electrode (DME). For most practical purposes, it is necessary to eliminate the maxima completely by adding a suitable surface active compound. The presence of 0.01% polyacrylamide is recommended as a maximum suppressor in all polarographic work. At a suitable speed of rotation (200 to 300 r.p.m.) the sensitivity of the RDME in the presence of a surface active substance is about ten times as great as that of the DME. Equation (3), derived in a previous paper2 accounts quantitatively for the relation between limiting current in the presence of a suitable maximum suppressor on the one hand and the concentration and diffusion coefficient of electroactive species, speed of rotation, kinematic viscosity and the characteristics of the electrode (m and t) on the other. The limiting current is practically indepndent of the pressure of mercury, but varies with ta, where a ⩾ 0 5. For reversible reactions half-wave potentials at the RDME are of the same order of magnitude as observed at the DME. The slight difference observed in the reduction of metal ions to metal amalgams is accounted for quantitatively by the larger rate of transport of electroactive species to the RDME. The RDME is recommended for the analysis of solutions containing one or more electroactive species in concentration of less than about l0-4N. For markedly higher concentrations the DME ib generally preferred." @default.
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- W2022184861 date "1958-01-01" @default.
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- W2022184861 title "Factors to be considered in quantitative polarography with the rotated dropping mercury electrode" @default.
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