Calculation of COD

What is Chlorine Disinfection?

Chlorine deactivates microorganisms through several mechanisms that can destroy most biological contaminants, including: Chlorine Formula

Damaging the cell wall
Altering the permeability of the cell (the ability to pass water in and out through the cell wall) • Altering the cell protoplasm
Inhibiting the enzyme activity of the cell so it is unable to use its food to produce energy

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Calculation of Chemical Oxygen Demand (C.O.D)

Apparatus:

Round bottom flask, water condenser, Burette, Pipette,Heating mantle.

Reagents:

* Mercuric sulphate (< 1gm)

* Sulfuric Acid (1 Kg H₂SO₄ + 5.5 gm Ag₂SO₄ ) dissolve for 24 hrs.

* 0.25 N Potassium Dichromate (12.259 gm K₂Cr₂O₇ dried at [....]