| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and a device for measuring organic content for monitoring carbon contents at a real time substantially without requiring any strict flow rate regulation. SOLUTION: This measurement device is provided with an oxidation container 10 allowing passage of a sample liquid, an ultraviolet light source 20 radiating ultraviolet light to the sample liquid inside the oxidation container 10, a lighting controlling means 21 turning off the ultraviolet light source 20 after turning it on for a fixed time, a conductivity detecting electrode 30 arranged in the vicinity of an outlet of the oxidation container 10, and a computing device 40 computing organic carbon contents in the sample solution from a difference between the base conductivity before turning on the ultraviolet light and the maximum conductivity after turning off the light. When a flow rate of the sample liquid passing through the oxidation container 10 is represented by F and an internal volume within an ultraviolet radiation range of the oxidation container 1 on the upstream side beyond the conductivity detecting electrode 30 is represented by V, the flow rate F is controlled so that a relationship F<=V/T is established between the flow rate F, the internal volume V, and a ultraviolet radiation time T.
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