Chemical Oxygen Demand

Chemical Oxygen Demand (COD) is defined as the amount of specified oxygen that reacts with a sample under controlled conditions. The Hanna COD method is based on the well established closed dichromate-reflux colourimetric method. It is normally measured in both municipal and industrial wastewater treatment plants and gives an indication of the efficiency of the treatment process.

COD is measured on both influent and effluent water. COD has further applications in power plant operations, chemical manufacturing, comercial laundries, pulp and paper mills, agriculture and animal waste runoff, environmental studies and general education.

The measurement procedure has been designed for ease of use by personnel at any skill level.