Studies on A.C. Polarography. IV. Reversible Behaviour of Anions

A train of a. c. polarographic investigations on several anions, which depolarize the dropping mercury anode, was carried out. The experimental results of a. c. polarography of Cl−, Br−, I− and CN− generally agreed with the theoretical consideration based on the reversible electrode process. Namely, it can be concluded that Breyer’s polarogram shows the derivative curve of the ordinary polarogram and Fournier’s current of these anions is regarded as the mean of two current intensities at both the extreme potentials of the pulsing potential produced by the superposition of a small a. c. voltage on the ordinary d. c. potential. Thus the electrode processes of these anions are found to be reversible. And the possibility of the application to the quantitative determination of these anions was found in the proper concentration range.