| 摘要 |
PURPOSE:To reduce the size of a pH sensor which measures the hydrogen ion concn. in a soln. from the response in electrode potential by depositing directly a polymer film derived from an arom. compd. on the surface of a conductor. CONSTITUTION:The pH sensor is constituted by coating the periphery of the bar-shaped conductor 11 consisting of platinum, etc. with an insulator 13 consisting of polyolefin or ''Teflon'', etc. and depositing and fixing a polymer film 12 derived from a hydroxy polynuclear arom. compd., amino polynuclear arom. compd. and polynuclear arom. carboxylic acid compd., etc. having respective prescribed constitutional formulas on the surface of the exposed top end. The sample soln. 22 is put into a vessel 21 and the pH sensor 23 and a reference electrode 24 are dipped in the soln. 22. The potential difference of the sensor 23 relative to the electrode 24 is measured with a potentiometer 26, by which the pH value is known. |
