公开(公告)号：JPH07229871A

公开(公告)日：1995-08-29

申请号：JP4302994

申请日：1994-02-17

Applicant: TOA ELECTRONICS

Inventor： OIKAWA KIKUO ,  MOTOHASHI RYOICHI ,  UCHIYAMA ETSUO

IPC: G01N27/416

Abstract: PURPOSE:To measure the concn. of an oxochlorine compd. such as dissolved chlorine dioxide using a membrane-coated electrode of a diaphragmn type polarograph electrode method or a galvanic cell type membrane-coated electrode without receiving the effect of the contamination or solvent of a soln. causing the deterioration or damage of the membrane-coated electrode. CONSTITUTION:The coating membrane 6 of a membrane-coated electrode of a diaphragmn type polarograph electrode method or a galvani cell type membrane coated electrode is exposed to the vapor phase 4 being in contact with the sample soln. in a container 2 airtightly isolated from the outside and chlorine dioxide in the vapor phase reaching diffusion equilibrium with respect to the sample soln. 1 is measured and, from the correlation between the preliminarily experimentally calculated concn. of chlorine dioxide dissolved in the sample soln. 1 and the concn. of chlorine dioxide in the vapor phase 4 held to a diffusion equilibrium state with respect to the soln. 1, the concn. of chlorine dioxide dissolved in the sample soln. 1 is calculated.

公开(公告)号：JPH036450A

公开(公告)日：1991-01-11

申请号：JP14237189

申请日：1989-06-05

Applicant: TOA ELECTRONICS

Inventor： OIKAWA KIKUO ,  FURUYA ETSUO

IPC: G01N27/416

Abstract: PURPOSE:To suppress the reduction of a liquid electrolyte and to prevent the contamination of a cathode by forming an anode from silver or silver/silver chloride while forming the cathode from gold or carbon and providing the third electrode composed of a noble metal or carbon to the periphery of the cathode. CONSTITUTION:A diaphragm 2 composed of polytetrafluoroethylene having a film thickness of 3 - 20mum is provided to one end of a cylindrical support 1 and a liquid electrolyte 3 composed of an acidic aqueous potassium chloride solution is received in the support 1 and a columnar insulator 6 is fixed to the support 1. An anode 4 is fixed to the outer periphery of the insulator 6 and a cathode 5 is fixed to the lower end thereof and one flat surface of the cathode 5 is arranged in contact with the diaphragm 2. The third annular electrode 7 provide din a concentric circular shape with respect to the cathode 5 is fixed to the periphery of the cathode 5 so that one flat surface thereof is arranged to the lower end of the insulator 6 in contact with the diaphragm 2. Voltages same or different are respectively applied to the cathode 5 and the electrode 7 from respective power supplies within a range generating a ClO2 reducing current and the ClO2 reducing current flowing between the anode 4 and the cathode 5 and transmitting through the diaphragm 2 is measured by an ammeter. The reducing current wherein the applied voltages are stable within a range of about 0 - 500mV can be obtained.