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Water Analysis COD / BOD

What is the difference between BOD, COD or TOC? 

Almost all wastewater treatment plants are required to measure one of these three items as a measure of the pollution value in the water. COD should always measure higher than TOC and then BOD.

COD or Chemical Oxygen Demand is the total measurement of all chemicals in the water that can be oxidized.

TOC or Total Organic Carbon is the measurement of organic carbons.

BOD- Biochemical Oxygen Demand  is supposed to measure the amount of food (or organic carbons) that bacteria can oxidize.

COD is usually a measurement of chemicals and the test is simple and easy to perform with the right equipment and can be done in 2 hours.

BOD usually takes 5 days.

TOC  are now available in tube kits that utilize COD digesters to run a test similar to a COD test method and are now possible to run a quick, simple and inexpensive TOC test.

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