POLAROGRAPHIC CHEMICAL SENSOR WITH EXTERNAL REFERENCE ELECTRODE

摘要

An electroanalytical electrode assembly comprises an electrically conductive wor king electrode which includes an electrical conductor (15) having a body of electrolyte material (16) thereupon and separate d from the analytical environment by a hydrophobic membrane (18). The membrane has an electrical conductivity greater than the electrical conductivity of the remainder of the measuring circuit and is selectably permeable for a preselected and ionic sp ecies, so as to provide a stable membrane potential. Use of an assembly of this type allows for placement of a reference electrode (2 0) external of the membrane (18).