Chemical Oxygen Demand (COD for short), is a measure of the biologically available and inert organic matter that is susceptible to oxidation by a strong oxidising agent.
COD is used as a measurement of pollutants by both municipal and industrial wastewater treatment plants to measure the efficacy of the treatment processes. COD is measured on both influent and effluent water. The efficiency of the treatment process is expressed as COD removal, measured as a percentage of the organic matter purified during the cycle. COD has further applications in power plant operations, chemical manufacturing, commercial laundries, pulp and paper mills, agriculture and animal waste runoff, environmental studies, and general education.
The Hanna COD method is based on the well-established closed dichromate-reflux colorimetric method.. The sample is added to the reagent vial, digested under closed reflux conditions, and allowed to cool before measurement is taken. Reference standards can be made using potassium hydrogen phthalate (KHP), 1 mg of KHP is equal to 1.175 mg COD.
Hanna equipment can be used for laboratory or on-site testing. The measurement procedure is designed for ease of use by personnel at any skill level.
Already test for COD?
If you currently measure COD then you might be pleased to know that Hanna COD reagents are industry compatible allowing the use of our reagents with other manufacturers equipment.
Send your COD samples off-site for testing?
If you currently send water samples away for COD analysis then you may also be pleased to know that the Hanna COD system provides accurate on-site testing and offers cost savings when compared to using an off-site laboratory for your COD testing.
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