A Wet chemistry Analyzer for measuring Concentration of COD (Chemical Oxygen Demand) in Water, following the colorimetric detection via Potassium dichromate reflux method.
COD Monitoring:
Oxygen is an important essential in the environment. If a water body is carrying excessive amount of waste materials, the oxygen will be consumed and damage the living species in the water. Various accepted method were issued out for determining the consumption of oxygen.
Chemical Oxygen Demand (COD) was introduced as an analytical method that is most popular government standard in the world. Chemmit W3111 COD is following this standard, operating an automated, reliable on-line COD analyzer.
Principle of Operation:
The principle of Chemmit W3111 COD analyzer is following US EPA method 410.4 abd APHA Standard Methods 5220 D. It oxidizes a sample by Potassium dichromate reflux method. When the sample transported into overflow cup, a certain volume sample is mixed with a dichromate reagent solution and sulfuric acid. The solution is refluxed at 150℃for a fixed period of time and then determines the consumption of dichromate by colorimeter. Reagents also contain silver sulfate as an oxidation catalyst and mercuric sulfate for the purpose to complex chloride ionics in sample.
The reagents are delivered by precise syringes, micro-processor controlled sequencing into reaction chamber. After adjustable period reaction, the COD value is determined by innovated LED emitter colorimetric detection.
General Specifications:
