The Biochemical Oxygen Demand (BOD) of a sample is the amount of dissolved oxygen required by aerobic microorganisms to breakdown organic matter in the sample.
The test is simple:
Measure the Dissolved Oxygen content of the sample (a)
Place in a sealed darkened bottle
Incubate for 5 days at 20'C
Measure the Dissolved Oxygen content of the incubated sample (b)
Generally you're using this test to analyse contaminated water, so you'll want to dilute it first - it may be that aren't enough aerobic microorganisms present to give you a measurable result, in which case you'll need to inoculate the sample with a suitable culture.
The BOD of the sample = a - b
BOD is expressed in mg O2/L of sample.
Extra Credit
Generally you're using this test to analyse contaminated water, so you'll want to dilute it first - it may be that aren't enough aerobic microorganisms present to give you a measurable result, in which case you'll need to inoculate the sample with a suitable culture.
The BOD of a diluted innoculated sample = ((a - b) - BOD of inoculated culture) * dilution factor
In the BOD (Biochemical Oxygen Demand) test, a blank is used to account for any oxygen demand exerted by materials other than the sample itself, such as the reagents and the dilution water. This ensures that the measured BOD reflects only the oxygen consumed by the biodegradable organic matter present in the sample. By subtracting the BOD of the blank from the sample's BOD, the results provide a more accurate assessment of the sample's organic pollution load.
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I think you mean BODMAS.It's an acronym used to remember the precendence of mathematical operations:B = Brackets firstO = Orders (squares, cubes, etc.)DM = Division / MultiplicationAS = Addition / Subtraction
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Bod - series - was created in 1975.
Bod - series - ended in 1984.
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Adjacent Angle
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if unseeded, BOD = (D1-D2)/Pif seeded, BOD = ((D1-D2)-(B1-B2)f)/PD1 = DO of diluted seeded wastewaterD2 = DO of wastewater after incubationB1 = DO of diluted seed sampleB2 = DO of seed sample after incubationf = ratio of seed volume in seeded wastewater test to seed volume in BOD test on seedP = decimal fraction of wastewater sample used. (vol. of wastewater)/(vol. of dilution water plus wastewater)Maybe that helps
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I want the basic difference of BOD incubater and Bacteriological incubater? We are used BOD incubater as a bacteriological incubater?
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When diluted water is added in surface wastewater to take immediate BOD is called unseeded and after 5 days of period wastewater received saturated oxygen from diluted water is called now seeded BOD.