Cathodic adsorption voltammetry of palladium(II)
The electrochemical behavior of palladium(II) was studied by differential pulse, linear sweep, and alternating-current square-wave voltammetry in HC1, HNO3, H2SO4, and HC1O4 solutions in the presence of dimethylglyoxime. A peak with a height linearly depending on the concentration of palladium(II) was observed in voltammograms. Typical relationships between the height and potential of a peak and pH, dimethylglyoxime concentration, the potential and time of adsorption accumulation suggested that the observed peak was due to the hydrogen liberation catalyzed by palladium(II) dimethylglyoximate adsorbed on the electrode surface. The detection limits for palladium(II) accumulated for 120 s at -0.2 V were 2 x 10-8, 5 x 10-9, and 8 x 10-10 M for differential pulse, linear sweep, and alternating-current square-wave voltammetry, respectively.
KeywordsPalladium Supporting Electrolyte Differential Pulse Linear Sweep Dimethylglyoxime
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