Method for detecting chemical oxygen demand of water body

It is an environmental water chemical oxygen demand (COD) measurement method, particularly based on nanometer photocatalysis principle to precess the water COD measurement method. Its main feature is using specialized preparation nanometer titanium dioxide membrane electrode as the working electrode to establish three electrodes system, and after photocatalysis, generating organic matter of the hole oxidation samples, so establishing responsive current in the detection loop circuit, and simultaneously, detecting the UV intensity arrived at membrane electrode, to calculate the response current generated by the unit light intensity correlated to the COD in samples. Using the unit light intensity response current, it can calculate the COD value in the samples. The method is mainly applicable to the water quality monitoring station, the monitoring laboratory, the sewage metering station, the sewage treatment plant, the water plant, the sewage plant, the water sector monitoring points, and other units. The method has rapid detection, no secondary pollution, low maintenance, high stability and precision, strong anti-jamming ability, not sensitive to chloride ion, and other features.