| 摘要 |
PURPOSE:To make it possible to perform measurement for a long period without special electrolyte and reagent which must be replenished and replaced by using a sample liquid itself containing chlorite ions as electrolyte, and measuring electrolysis current. CONSTITUTION:Two electrodes of working electrode 3 and a counter electrode 4 or three electrodes of the electrodes and an additional reference electrode 5 are immersed into a sample liquid 2. The electrode 3 comprising noble metal or carbon is relatively moved with respect to the sample liquid 2. Chlorite ions in the sample liquid 2 undergo electrolysis, and oxidizing current is generat ed. The voltage of the oxidizing current is applied to the electrode and the generated current is measured with an ammeter 6 with the couter electrode 4 as a reference in the case of two electrode and with a potentiostat 7 with the electrode 5 as a reference in the case of the three electrodes. Since the oxidizing current is proportional to the concentration of the dissolved chlorite ions, the concentration of the chlorite ions in the sample liquid 2 can be obtained by obtaining the relationship between the concentration of the chlorite ions and the value of the oxidizing current beforehand. |
