| $BOD$ | $COD$ |
| $(1)$ $BOD$ stands for Biochemical Oxygen Demand. | $(1)$ $COD$ stands for Chemical Oxygen Demand. |
| $(2)$ It is a test used to measure the concentration of biodegradable organic matter present in a water sample. | $(2)$ It is a test used to indirectly measure the total amount of organic compounds (both biodegradable and non-biodegradable) in water. |
| $(3)$ Micro-organisms such as bacteria are used as biological oxidizing agents. | $(3)$ Strong chemical oxidants such as potassium dichromate are used. |
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