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FACTORS AFFECTING THE QUALITY OF WATER
The terms dissolved oxygen, biochemical oxygen demand and chemical oxygen demand are frequently used in my, ensuring the quality of water. These terms are desxcu=ribed as follows

Dissolved oxygen (DO)
In water the most important oxidizing agent is dissolved molecular oxygen O2 the concentration of which ranges from 4--8 ppm. The organ matter is oxidized with the help of this dissolved oxygen in water. It is a parameter to determine the quality of water. The dissolved oxygen value less than 4ppm indicates that water is polluted.

Biochemical oxygen demand (BOD)
It is the capacity of organic matter in natural water to consume oxygen within a period of five days. The value of BOD is the amount of oxygen consumed as a result of biological oxidation of dissolved organic m, matter in the sample. The oxidation reaction is catalyzed by microorganism, which are already present in the natural water it is measured experimentally by calculating the conservation of oxygen, at the beginning and at the end of the five day period in which salt water sample is maintained in the dark at constant temperature either at 20 C or 25 C.

Chemical oxygen demand (COD)
THE ORGANIC CONTENT OF WATER WHICH CONTAIN CO0NSUMES OXYGEN DURING CHEMICAL OXIDATION IS EVALUATED BY ITS CHEMICAL OXYGEN DEMND. THE OXYGEN DEMAND OF WATER CAN BE DETERMINED DIRECTLY BY TRAETING IT WITH DICHROMATE ICONs Vr2O7 WHICH IS A POWERFUL OXIDIZING AGENT.
THE ORGANIC MATTER IN WATRE IS OXIDIZED, WHILE THE REMAINING DICHROMATE IS DETERMINEDTIETERMETRICALLY.
VALUR COD IS A DIRECT MEASURE OF CHEMICALLY OXIDIZABLE MATTER IN WATER. HIGHER VALUE OF COD WILL INDICATE MORE POLLUTION.

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