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https://www.environmentalexpress.com/ee/s/article/biochemical-oxygen-demand-bod
The BOD value is calculated from the depletion and the amount of sample used. What You Should Know. The actual procedure is so much more involved than the summary given above. The biggest challenge in the BOD test is that of time. The holding time for a BOD sample is 48 hours from collection. The test itself requires a five day incubation period.
https://www.environmentalleverage.com/BOD%20vs%20COD.htm
Generally, COD is preferred to BOD for process control measurements because results are more reproducible and are available in just two hours rather than five days. By the time you have the results from a five day test, the wastewater treatment plant conditions are no longer the same, so real time monitor and control can not be relied upon by the use of BOD.
https://www.sciencedirect.com/topics/earth-and-planetary-sciences/biochemical-oxygen-demand
Biological Oxygen Demand. BOD is the oxygen consumed by microorganisms as they break down organic material. Although similar to COD in that it measures the amount of organic compounds, it differs in that it only measures the biologically active organic matter. The standard test for BOD is the five-day (BOD 5) test carried out in the dark at 20 °C. The five-day time interval originated …
https://aosts.com/biochemical-oxygen-demand-bod-in-wastewater-treatment/
Biochemical oxygen demand or biological oxygen demand (BOD) is a measure of the amount of Dissolved Oxygen (DO) required by aerobic microorganisms to decompose organic matter present in a sample of water at a certain temperature over a studied period. BOD value is usually expressed in milligrams of oxygen per liter of water (mg/L).
https://inspectapedia.com/septic/BOD5_Wastewater_Test.php
Biochemical Oxygen Demand (BOD) is a measure of the oxygen used in bacteria mediated oxidation of organic substances in water and wastewater. Theoretically an infinite time is required for complete biochemical oxidation of organic matter, but the measurement is made over 5-days at 20 0C or 3-days at 27 0C test period with or without dilution.
https://www.pharmaguideline.com/2013/06/determination-of-biological-oxygen.html
The amount of oxygen, taken up by the microorganisms that decompose the organic waste matter in wastewater is known as biological oxygen demand or biochemical oxygen demand. Therefore i t is used to measure the amount of certain type of organic water pollution BOD is calculated by keeping a sample of water containing a known amount of …
https://en.wikipedia.org/wiki/Biochemical_oxygen_demand
Incubation periods of 1, 2, 5, 10 and 20 days were being used into the mid-20th century. Keeping dissolved oxygen available at their chosen temperature, investigators found up to 99 percent of total BOD was exerted within 20 days, 90 percent within …
https://biocyclopedia.com/index/enivronmental_science_engineering_laboratory_methodology/determination_of_bod_of_waste_water_sample.php
The Biochemical Oxygen Demand (B.O.D.) of sewage or of polluted water is the amount of oxygen required for the biological decomposition of dissolved organic matter to occur under aerobic condition and at the standardised time and temperature. Usually, the time is taken as 5 days and the temperature 20°C as per the global standard.
https://pubs.usgs.gov/twri/twri9a7/twri9a7_nfmchap7_2_bod.pdf
Five-Day Biochemical Oxygen Demand (11/2003) USGS TWRI Book 9–A7 (Third Edition) + + + 6—BOD 7.0.1 EQUIPMENT AND SUPPLIES Table 7.0-1 lists equipment and supplies commonly used in the BOD 5 test using amperometric determination of DO.
http://butane.chem.uiuc.edu/pshapley/Environmental/L31/1.html
BOD level is a common metric for water pollution. The BOD level is determined by comparing the dissolved oxygen levels of a water sample before and after 5 days of incubation in the dark (see the next section for this).
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