oneProduct Introduction:
The method adopts the national standard GB11914-89 for water quality chemical oxygen demand determination (potassium dichromate method). The water sample, a mixture of potassium dichromate, silver sulfate (catalyst for more complete oxidation of linear aliphatic compounds), and concentrated sulfuric acid are heated to 175 ℃ in a digestion tank. During this period, chromium ions are reduced from VI valence to III valence as oxidants, and the color change is proportional to the content of organic compounds in the sample. The instrument directly displays the COD of the sample through colorimetric conversion.

2、 Comparison between different methods:
There are three common types of instruments on the market: potassium dichromate colorimetric method, non dispersive infrared absorption method (TOC), ultraviolet (UV) method (referring to the environmental protection industry standard HJ/T353-2007), non dispersive infrared absorption method (TOC), and ultraviolet (UV) method. In complex water quality situations, the error can exceed 50%. Generally applicable to relatively simple and stable water quality. The potassium dichromate colorimetric method is a traditional national standard method, which is suitable for complex and unstable water quality in wastewater, according to the environmental protection industry standard HJ/T353-2007. (Refer to the environmental protection industry standard HJ/T353-2007)

3、 Product application:
Widely used in wastewater treatment, purified water, circulating water, boiler water and other systems, as well as in electronic, electroplating, printing and dyeing, chemical, food, pharmaceutical and other process fields, it has powerful functions in remote monitoring system applications such as surface water and pollution source emissions.

4、 Technical parameters: