However, COD is less specific, since it measures everything that can be chemically oxidized, rather methods of biochemical analysis pdf just levels of
However, COD is less specific, since it measures everything that can be chemically oxidized, rather methods of biochemical analysis pdf just levels of biodegradable organic matter. Populations of these microorganisms tend to increase in proportion to the amount of food available. Fish and aquatic insects may die when oxygen is depleted by microbial metabolism. Biochemical oxygen demand is the amount of oxygen required for microbial metabolism of organic compounds in water.
Dissolved oxygen depletion is most likely to become evident during the initial aquatic microbial population explosion in response to a large amount of organic material. 0 parts per 100,000 of dissolved oxygen in 5 days. This general standard should be prescribed either by Statute or by order of the Central Authority, and should be subject to modifications by that Authority after an interval of not less than ten years. This temperature may be significantly different from the temperature of the natural environment of the water being tested. Incubation periods of 1, 2, 5, 10 and 20 days were being used into the mid-20th century.