The 2-Minute Rule for BOD test procedure

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For the duration of this period microorganisms decompose the natural subject present in water and take in the dissolved oxygen. BOD is calculated by figuring out the dissolved oxygen within the sample ahead of and just after incubation. As described above intimately.

High concentrations of organics can deplete dissolved oxygen concentrations in water, resulting in negative environmental and regulatory outcomes.

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When the wastewater sample is tested at total strength, then 2 ml is added on the corresponding vial. If dilution is necessary, then serial dilutions are executed and a couple of ml with the diluted sample are added towards the corresponding vial.

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Sometimes, there is likely to be organic compounds that require additional incubation time for click here you to degrade. This may lead to a lower value of BOD getting computed.

Temperature plays a crucial requirements in identifying the results of the BOD test. When there is a minor modify within the incubation temperature, it'd hamper the microbial activity In the sample.

Just about every vial is combined effectively and placed into the reactor block for 2 several hours. Right after two several hours, the vials are faraway from the block to some cooling rack for approximately 15 minutes.

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The ultimate DO reading is then subtracted through the Original DO reading through and The end result is the BOD concentration (mg/L). If your wastewater sample needed dilution, the BOD focus looking at is multiplied from the dilution issue.

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