Question

Difference between Chemical oxygen demand and biological magnification​

Answer 1

Chemical Oxygen Demand or COD:- It is the oxygen requirement by chemical K2Cr207 for oxidation of total organic matter (biodegradable + non biodegradable) in water.

• Special note:- COD value is always higher than BOD value.

Biological magnification:- Such type tissue gets accumulated due to increase in concentration along the food chain which is known as biological magnification.

• Special Note:- The non biodegradable pollutant like Al, Hg, Fe, DDT, pesticides, phenolic compound ABS (Alkyl benzene sulphonate) are not decomposed by micro-organisms. The highest concentration occurs in top consumer.

Answer 2

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