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Its full form is biological oxygen demand.

Answer:

The 5 day Biological Oxygen Demand (BOD5) is a measure of how much biologically usable dissolved organic material is present in a water sample. The units used are mg/liter (mg/L). The material can be eaten up bu microbes which remove oxygen in thee water. If this happens the low oxygen levels in the water make it unusable and or hazardous to fish.

BOD5 is measured by putting a sample of the contaminated water in a sealed container, oxygenating it, then adding a microbial culture. The level of oxygen is measured at the end of 5 days and the concentration of organics is calculated.

Companion tests include Chemical Oxygen Demand (COD) and Total Organic Carbon (TOC)

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13y ago

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