Divyansh kumar

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11th Class Chapter No 14 - Environmental Chemistry in Chemistry for CBSE NCERT

Components of Environment:

  • Atmosphere: This comprises a blanket of gaseous layer around earth. 

  • Hydrosphere: This comprises about 96% of earth’s surface & includes all sources of water like oceans rivers lakes, glaciers, ground water etc.

  • Lithosphere: It refers to earth’s solid crust containing the outer mineral cover. It comprises soil, minerals, organic matter etc.

  •  Biosphere: It refers to the domain of living organism in covalent with atmosphere hydrosphere as well as lithosphere.  

Environmental Pollution :

Process of contamination of the environment with harmful wastes arising mainly from human activities.

  • Pollutant:  Any substance or species produced either by a natural source or by human activity, which produces adverse effect on the environment.

  • Contaminant: A substance which does not occurs in nature but is introduced by human activity into the atmosphere affecting its composition.

  • Source: The site from which the pollution or contaminants originate.

  • Sink: The material or medium which consumes or interacts with a long lived pollutant is called sink. 

  • Receptor : Anything that is affected by the pollutants.

  • Threshold limit value (TLV) : This indicates the permissible limit of a pollutant in atmosphere to which a healthy worker is exposed during hours a day or 40 hours a week for life time without any adverse effects. TLV are determined by experimentation on animals, by use of medical knowledge, epidemiology surveys & environmental studies.  

Posted in 11th on August 23 2019 at 04:43 PM


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