ELECTRODE FOR ELECTROCHEMICAL DETECTOR

摘要

PURPOSE:To detect extremely trace amts. of materials with a high sensitivity without clogging in spite of long-term use by forming electrodes by using a porous graphitic carbon molding having specific physical properties. CONSTITUTION:The electrodes are used by using the porous graphitic carbon molding having the physical properties of (1) to (3). (1) The average pore size is 0.1 to 50mum. (2) The specific surface area is >=10m<2>/g. (3) The average interlayer spacing (d0.02) of the carbon determined by an X-ray diffraction analysis method is 3.35 to 3.42Angstrom . The clogging by detecting materials or impurities arises in long-term use if the average pore size is too small. The contact of liquid and the inside surface of the electrodes is insufficient and the analysis with good efficiency is not possible if the average pore size is too large. Large electrical conversion characteristics are not obtd. and the analysis with good efficiency is infeasible if the specific surface area is too small. Further, the graphitization is insufficient and the surface is deteriorated with the carbon material having the average interlayer spacing of carbon large than 3.42Angstrom . Such material does not withstand long-term use.