抄録
The change of the surface potential (electrolytic solution pressure) of the mercury containing some amount of natrium (Na-amalgam) immersed in NaCl solution (1%) was investigated when the surface of Na-amalgam was exposed in the solution and let the current flow in or out of the surface from the electrophysiological view point. The following results were obtained.
1) The surface potential of the mercury was about 0.2 V (against carbon electrode in NaCl solution) but that of Na-amalgam was about 2.0 V, which decreased gradually at first and then quite abruptly to zero when the surface was exposed in NaCl solution.
2) By application of the flow out current from the surface of Na-amalgam, temporal increase of the surface potential was shown but after the off of the current its potential decreased toward the original level.
3) By application of the flow in current to the surface of Na-amalgam, the surface potential decreased temporally but soon returned to the original level.
4) The time course of potential change from the altered level to the original one was different from that of polarization potential.
5) These change of surface potential of Na-amalgam was assumed to depend on that the Na molecule contained in amalgam appears to the surface or disappears from the surface due to the applied current, and also assumed that the surface membrane, for example oxide membrane of electrochemical model of excitation consisting of iron and nitric acid, was not formed.
