NOVELTY - The apparatus comprises a working electrode submerged in a first reaction chamber (104) containing liquid electrolyte (106), a counter electrode submerged in a second reaction chamber (110) containing liquid electrolyte, a reference electrode submerged in a third reaction chamber (114) and electrolytically connected to the working electrode, and an ion conductor electrolytically connecting the first reaction chamber and the second reaction chamber while physically separating the first and second reaction chambers. The ion conductor includes a perfluorosulfonic acid membrane.    USE - The apparatus is useful for analysis of electrochemical dissolution (claimed) in fuel cell systems that are used in energy plants.    ADVANTAGE - The apparatus analyses the electrochemical dissolution with improved accuracy.    DETAILED DESCRIPTION - The apparatus comprises a working electrode submerged in a first reaction chamber (104) containing liquid electrolyte (106), a counter electrode submerged in a second reaction chamber (110) containing liquid electrolyte, a reference electrode submerged in a third reaction chamber (114) and electrolytically connected to the working electrode, and an ion conductor electrolytically connecting the first reaction chamber and the second reaction chamber while physically separating the first and second reaction chambers. The ion conductor includes a perfluorosulfonic acid membrane sealingly positioned between openings below a liquid electrolyte level in both the first reaction chamber and second reaction chamber, a porous glass positioned between openings below a liquid electrolyte level in both the first reaction chamber and second reaction chamber, and a salt bridge connecting the liquid electrolyte of the first reaction chamber and the second reaction chamber. The salt bridge contains highly conductive electrolyte physically enclosed from the liquid electrolyte of the first reaction chamber and the second reaction chamber. The highly conductive electrolyte is physically enclosed from the liquid electrolyte of the first reaction chamber and the second reaction chamber with one of porous glass and a permeable membrane. The apparatus further comprises a unit for adjusting a temperature of both the first reaction chamber and the second reaction chamber. The first and second reaction chambers have double-walls. The third chamber includes a glass tube submerged in the liquid electrolyte in the first reaction chamber, and is electrolytically connected to the first reaction chamber through an end of the glass tube. The working electrode includes a rotating disk electrode. The first reaction chamber has a sample port (150)configured to take a sample of the liquid electrolyte in the first reaction chamber, and the second reaction chamber has a sample port configured to take a sample of the liquid electrolyte in the second reaction chamber. The liquid electrolytes in first and second reaction chambers are present in electrolytic communication with and are physically separated to each other. The liquid electrolytes in the third and first reaction chambers are present in electrolytic contact with each other. The glass tube has a capillary-sized opening that provides the electrolytic contact. The perfluorosulfonic acid membrane and the porous glass have a first side forming a sealing engagement with an opening of the first reaction chamber and a second side forming a sealing engagement with the opening of the second reaction chamber, and provide electrolytic contact and physical separation between the liquid electrolytes in the first and second reaction chambers. The salt bridge has a first end in contact with the liquid electrolyte of the first reaction chamber and a second end in contact with the liquid electrolyte of the second reaction chamber, and salt bridge provides electrolytic contact and physical separation between the liquid electrolytes. The highly conductive electrolyte is physically enclosed in the salt bridge with porous glass at each of the first end and second end.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a three compartment three-electrode electrochemical cell.    First reaction chamber (104)    Liquid electrolyte in first reaction chamber (106)    Second reaction chamber (110)    Third reaction chamber (114)    Sample port. (150)