overview
Chemical Oxygen Demand, abbreviated as COD. It is the amount of oxidant consumed when using a certain strong oxidant to treat water samples under certain conditions. It is an indicator of the amount of reducing substances in water. The reducing substances in water include various organic compounds, nitrites, sulfides, ferrous salts, etc., but the main ones are organic compounds. Therefore, chemical oxygen demand (COD) is often used as an indicator to measure the content of organic matter in water. The higher the chemical oxygen demand, the more severe the pollution of organic matter in the water body.

This instrument uses a special reagent containing a composite catalyst that accelerates the reaction and has anti-interference effect on chloride ions. The water sample undergoes a rapid oxidation-reduction reaction with a specially designed reagent in a digester, producing trivalent chromium ions. The concentration is determined by spectrophotometry to obtain the corresponding COD value.

The COD rapid analyzer has greatly improved in terms of stability, accuracy, measurement range, and practicality. Suitable for various needs of different users, it can be used for monitoring industrial wastewater such as chemical, petroleum, coking, papermaking, metallurgy, brewing, pharmaceuticals, and various domestic sewage. It can be widely applied to the detection of wastewater from various industries (industrial wastewater, urban sewage, domestic sewage, and surface water in rivers and lakes).

Technical parameters and performance indicators

Technical parameters:

L. Determination method: Rapid catalytic method (chromium method);

2. Measurement range: Low range 0~150mg/L

High range of 100~1000mg/L (diluted measurement when>1000 mg/L);

3. Measurement error: 5-100 mg/L, absolute error ≤± 5 mg/L; 100 mg/L~1000 mg/L, relative error ≤± 5%

4. Dissolution temperature: 165 ± 1 ℃; Dissolving time: 15 minutes;

5. Measurement time: Simultaneously measure 9, 12, or 25 water samples within 30 minutes; (The number of water samples varies depending on the configuration)

6. Temperature indication error ＜ ± 1 ℃;

7. Temperature field uniformity ≤ 2 ℃;

8. The error of the digestion time indication is ≤± 2%;

9. Record storage: It can store 20 measurement results.

Performance indicators:

1. Environmental temperature: (5~40) ℃;

2. Environmental humidity: Relative humidity<85% (no condensation);

3. Working power supply: AC220V ± 10%/50Hz;