A dropping carbon fluid electrode prepared from graphite powder and low-viscosity liquid paraffin was introduced to a voltaic cell to estimate real potentials and absolute electrode potentials. The compensation potential was measured for the cell composed of the dropping carbon fluid electrode, a KCl aqueous solution, and an Ag/AgCl electrode. From the experimental result, the real potential of Cl ion was determined to be 320 kJ mol(-1), which agreed well with the values reported by Parsons (317 kJ mol(-1)) and Fawcett (318 kJ mol(-1)). Furthermore, the absolute electrode potentials of Ag/AgCl and standard hydrogen electrode were determined to be 4.62 V and 4.40 V, respectively. The latter was also consistent with the values obtained by Trasatti (4.44 V) and Fawcett (4.42 V).