Dissolved Oxygen Test

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PARAMETERS FOR ANALYSIS
1. ELECTRICAL CONDUCTIVITY
2. DISSOLVED OXYGEN TEST
3. BIOLOGICAL OXYGEN DEMAND TEST
4. CHEMICAL OXYGEN DEMAND TEST
5. PH
6. TOTAL DISSOLVED SOLIDS
BOD TEST
5ml of waste water sample was introduced into the 300 ml of BOD bottle. The lid of bottle was tightened so that no air bubble could reside in it. It was then sealed and after that addition of deionized water was carried out in the bottle.
At the beginning stage of calculating BOD by using dissolved oxygen meter, value of the dissolved oxygen was found to be 8mg/L.
After this, bottle was to be left in the incubator for five days.
After five days, final value of dissolved oxygen was again measured by using the DO meter. It was found to be about 4mg/L.
Value of BOD was then calculated by putting the
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• In order to stabilize the reactor and colorimeter both of these instruments are turned on.
• Sulphuric acid and acetone were added to the 2mL of waste water sample and in this way value of COD was calculated.
• The sample was then shaked well and then it was shifted to the reactor block for about two hours.
• After that it was kept in the cooling rack for 15 minutes.
TDS TEST
• An analytical balance of about 0.0001 g was used.
• 250 mL of clean beaker was used.
• 100 mL of the filtrate from the given sample was added to the beaker.
• Hot plate was then used for evaporating the water sample and to maintain it dryness.
• This evaporation was carried out slowly.
• As a result of heating, vaporization or decomposition of some of the dissolved solids occurred but not completely.
• Samples were heated in such a way that over heating may not occur.
• After the samples got dry, weight of the solids present within the containers was again determined. These solids particles were dissolved in 1000 mL of

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