Photochemical smog
Photochemical smog
Photochemical smog
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Oxygen Demand<br />
The most common substance oxidized by dissolved oxygen in water is organic<br />
matter having a biological origin, such as dead plant matter and animal wastes.<br />
If, for the sake of simplicity, the organic matter is assumed to be entirely<br />
polymerized carbohydrate (e.g., plant fiber) with an approximate empirical<br />
formula of CH 2 O, the oxidation reaction would be Dissolved oxygen in water is<br />
also consumed by the oxidation of dissolved ammonia, NH 3 , and ammonium<br />
ion, NH 4+ -substances that, like organic matter, are present in water as a result<br />
of biological activity-eventually to nitrate ion, N0 - 3- .
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