| 摘要 |
PURPOSE:To take a stable on-line measurement of the amount of organic pollutant in water from the production amount of CO2 by oxidation, by oxidizing test water with ozone. CONSTITUTION:While air is supplied to the test water in a reaction tank 1, acid is injected from a supply source 6 to <=4pH and the CO2 concentration in the water is balanced with that in the air. Then, alkali is injected from a supply source 7 to about 11pH and an ozonizer 2 is powered on to supply ozone to the test water, starting the integration of a computing element 9. Then, the ozone supply is stopped at a reaction end point and acid is injected into the test water again to <=4pH. Consequently, CO2 carried into the test water by the injected air and CO2 produced by the oxidation are discharged together with discharge gas, so that the CO2 concentration in the test water becomes equal to the concentration in the start of the reaction eventually. Thus, the output of the computing element 9 reduced to the negative side during the oxidation turns positive by an extent corresponding to the amount of CO2, and the concentration of the pollutant is known from said value. |
