Bioaccumulation
Increase in concentration of pollutant in an organism
Bioaccumulation is the accumulation of substances in living organisms.
Usually, body has mechanisms to remove all the unwanted and toxic products away from the body. Bioaccumulation results when the accumulating rate is much higher than the removal rate
In order to remove toxics with urine, they should be water soluble. Bioaccumulative substances are normally fat soluble and cannot be broken down into smaller molecules. Therefore, they tend to remain in the body.
Biomagnification
Increase in concentration of pollutant in a food chain
Biomagnification is the increase in the substance concentrations as you go higher in a food chain.
The pollutants must be long-lived in order to cause biomagnification
it should be mobile, so that it easily enter into biological systems in means of food or water. If it is not mobile, it may stay inside one organism and will not be passed into the next tropic level.
If they are soluble in fat, they tend to remain in bodies of organisms for a longer period.
Further, in order for biomagnification to occur, the pollutant must be biologically active
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15 сен 2024