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ENVIRONMENTAL CHEMISTRY

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ENVIRONMENTAL CHEMISTRY ( environmental-chemistry )

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406 CHEMISTRY ENVIRONMENTAL CHEMISTRY UNIT 14 After studying this unit, you will be able to The world has achieved brilliance without wisdom, power without conscience. Ours is a world of nuclear giants and ethical infants. You have already studied about environment in your earlier classes. Environmental studies deal with the sum of all social, economical, biological, physical and chemical interrelations with our surroundings. In this unit the focus will be on environmental chemistry. Environmental chemistry deals with the study of the origin, transport, reactions, effects and fates of chemical species in the environment. Let us discuss some important aspects of environmental chemistry. 14.1 ENVIRONMENTALPOLLUTION Environmental pollution is the effect of undesirable changes in our surroundings that have harmful effects on plants, animals and human beings. A substance, which causes pollution, is known as pollutant. Pollutants can be solid, liquid or gaseous substances present in greater concentration than in natural abundance and are produced due to human activities or due to natural happenings. Do you know, an average human being requires nearly 12-15 times more air than the food. So, even small amounts of pollutants in the air become significant compared to similar levels present in the food. Pollutants can be degradable, like discarded vegetables which rapidly break down by natural processes. On the other hand, pollutants which are slowly degradable, remain in the environment in an unchanged form for many decades. For example, substances such as dichlorodi- phenyltrichloroethane (DDT), plastic materials, heavy metals, many chemicals, nuclear wastes etc., once released into the environment are difficult to remove. These • • • • • • • understand the meaning of environmental chemistry; define atmospheric pollution, list reasons for global warming. green house effect and acid rain; identify causes for ozone layer depletion and its effects; give reasons for water pollution and know about international standards for drinking water; describe causes of soil pollution; suggest and adopt strategies for control of environmental pollution; appreciate the importance of green chemistry in day to day life. 2019-20

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