| 摘要 |
PURPOSE:To make it possible to detect COD in a solution rapidly and continuously, by mixing a solution to be measured, an oxidizing agent solution and a liquid rising in its temp. upon the mixing with water to react the same and measuring the redox potential of the reacted solution. CONSTITUTION:A solution to be measured (e.g., waste water), an oxidizing agent (KMnO4) solution and a liquid rising in its temp. upon the mixing with water (e.g., concn. sulfuric acid) are respectively supplied to the upper reaction tube of a heat insulating container in a reactor 1 through supply tubes 41, 42, 43 and mixed to raise the temp. of the resulting mixture. Subsequently, the reaction mixture is sent to a reaction promotion pipe and passed through a cooler 5 from the outtake port thereof to be sent to a detection container 6 where the redox potential of the reacted solution is detected by using an electrode 6a of a temp. and redox potential detector (recorder) 7 and converted to COD which is, in turn, recorded. When the COD value is equal to or more than a set value, an alarm is issued from an alarm 8. The detector 7 is constituted so as to also detect the temp. of the reaction tube. By this method, even a solution containing a hardly oxidized org. component, for example, glycol can be subjected to the measurement of COD rapidly, continuously and precisely. |
