Trending. 1  Apple is about to dramatically change the way you use an iPhone The trusty home button is going away. 2  Apple to FCC: Protect net neutrality and donât allow online fast lanes Itâs the companyâs first comments in the 2017 debate.
COD or Chemical Oxygen Demand definition. Chemical oxygen demand (COD) is a measure of the capacity of water to consume oxygen during the decomposition of organic matter and the oxidation of inorganic chemicals such as Ammonia and nitrite.
Biochemical Oxygen Demand-BOD. Biochemical oxygen demand or B.O.D. is a chemical procedure for determining the amount of dissolved oxygen needed by aerobic biological organisms in a body of water to break down organic material present in a given water sample at certain temperature over a specific time period.