Calculation of BOD
The BOD value is calculated by subtracting the Final DO from the initial DO value. The formula for calculating BOD is
BOD= (Initial DO- Final DO) x Dilution Factor / Volume of Sample
Here,
- DO stands for Diffused oxygen
- Initial DO is the one taken before incubation
- The final DO is the one taken after incubation
- The dilution factor is the ratio of the volume of the sample to the diluted sample.
The value of BOD is expressed in mg/L which denotes the amount of oxygen consumed.
What is BOD Test?
The BOD test acts as an important criterion for knowing the health of an ecosystem. The BOD Test of Water is done to know how impure or pure the water body is. The BOD test procedure involves the collection of the water sample in an air-tight container which is then kept in incubation for five days at 20 ℃. The sample of water contains microorganisms that have the function of decomposing organic matter. They utilize oxygen present in the water to do so. BOD measures the amount of oxygen that gets consumed.
Table of Content
- Definition of BOD
- Objectives of BOD Testing
- Principle of BOD Test
- Calculation of BOD
- BOD Test Procedure
- BOD Test Measurement Problems
- Importance of Biochemical Oxygen Demand
- Limitations of the BOD Test
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