The standard method for COD determination is the reflux digestion titration method, which has a long digestion time (2 hours), high energy consumption, high reagent costs, and low efficiency, often troubling practical operators. We can use open tube reflux heating digestion or sealed digestion method, using special catalysts and oxidants. After adding oxidants and catalysts to the water sample, it is heated and digested. The Cr6+in the oxidant is partially reduced to Cr3+, and the reduced Cr3+content is converted into COD (cr) in the water sample through colorimetric measurement and regression calculation. The actual sampling method for COD (cr) in the water sample is automatic pneumatic sampling and drainage

Measurement range: 0-1000mg/L, dilution measurement greater than 1000mg/L

Measurement error: 5-100mg/L Error ≤± 5mg/L

Relative error between 100mg/L and 1000mg/L is ≤± 5%

Anti chlorine interference: C1<1000mg／L

Dissolving time: 10-120 minutes

Power supply: AC220V 1500W