Abstract
Summary A phase-selective a.c. polarograph is described which operates on a sampling principle using a gating circuit. Conventional a.c. polarograms are obtained, but, in addition, direct measurement of the electrode double-layer capacity vs. potential is possible, even in the presence of a diffusion-controlled faradaic process. Results show that the double-layer capacity is not measurably altered by the presence of Cd2+ or Zn2+ but that Tl+ is adsorbed strongly in the vicinity of its reduction wave.
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