Environmental
Chemistry
We
are very familiar with the word environment. It includes the air we breathe,
the water that covers most of the earth's surface, the plants and animals
around us and much more. These days, when we hear people talk about “the
environment”, they are often referring to the overall condition of our planet,
or how healthy it is.
Environmental
chemistry is a branch of chemistry which deals with the study of chemicals and
chemical processes. occuring in the enviroment by direct human activities. It
also deals with sources, causes and methods of controlling air, water and soil
pollution.
Any
undesirable change in our environment that has harmful effects on plants,
animals and human beings is called environmental pollution.
Environmental
pollution is usually caused by the addition of waste products of human activity
to the environment. The substances which cause pollution of environment are
called pollutants. The pollutants may be solids, liquids or gaseous substances
present in significant concentration in the environment.Our environment becomes
polluted day by day, by the increased addition of industrial and domestic
wastes to it. The air we breathe, the water we drink and the place where we live
in, are highly contaminated.
The
pollutants are classified as bio-degradable and non-biodegradable pollutants.
The
pollutants which can be easily decomposed by the natural biological processes
are called bio-degradable pollutants. Examples:plant wastes, animal wastes etc.
The
pollutants which cannot be decomposed by the natural biological processes are
called Non bio-degradable pollutants. Examples: metal wastes (mainly Hg and
Pb), D.D.T, plastics, nuclear wastes etc., These pollutants are harmful to
living organisms even in low concentration. As they are not degraded
naturally,it is difficult to eliminate them from our environment.
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