Oxygen demand

Oxygen demand is an environmental chemistry term that may refer to:


 * Biochemical oxygen demand (BOD), the amount of oxygen needed by organisms to break down organic material present in a water sample
 * Carbonaceous biochemical oxygen demand (CBOD), the amount of oxygen needed to break down carbon compounds, excluding nitrogen compounds
 * Chemical and biological oxygen demand, the combination of biochemical (BOD) and chemical oxygen demand (COD)
 * Chemical oxygen demand (COD), a test commonly used to indirectly measure the amount of organic compounds in a water sample
 * Nitrogenous oxygen demand (NOD), the amount of oxygen required to break down nitrogenous compounds in a water sample, like ammonia
 * Theoretical oxygen demand (ThOD), the calculated amount of oxygen required to oxidize a compound to its final oxidation products