抄録
To investigate the characteristics of the electrolytically chloridized silver-silver chloride electrode used in the field of electronic biomedical instrumentation, the electrode potential in the range of weeks and the impedance of 10mHz to 10kHz were measured in 0.1M and 1M KCI solutions at 25.0°C. The amounts of chloridized electric charge were controlled within 0.1mC/cm2_??_5C/cm2. The potentials (vs. Ag-AgCI) of silver-silver chloride electrodes in 0.1M KCI solution were shown. The potentials were becoming stable after about 2 weeks of chloridizing process and around 10 to 20μV in the vicinity of zero-potential . The minimum points appear in the curves of impedance versus chloridized electric charge at about 0.5C/cm2 in 0.1M and 1M KCI solutions. It shows the most suitable condition of the process for biomedical instrumentation interfaces. However, the amounts of 1 to 3C/cm2 should be practically chosen because of the loss of AgCl while working. The suitable amount of chloridized electric charge Q should be selected as follows: Q=1_??_3C/cm2 in measurements in dc or the lower frequency rather than 10Hz, and Q<0.1C/cm2 in the higher frequency range over 1kHz.
