EXPERIMENT :DETERMINATION OF CHEMICAL OXYGEN DEMAND (COD)
1. OBJECTIVES
- To determine the chemical oxygen demand of the given wastewater samples.
2. PROCEDURE
- Preparing the Sample
1. Open a reaction vial with a white cap and add the specified volume. (Ensure that appropriate personnel safety equipment is used.)
- LR-/MR: 2 ml water sample
- HR: 0.2 ml water sample
2. Prepare a blank by using deionised water (TOC-free) instead of the sample (LR/MR: 2 ml, HR: 0.2 ml).
3. Replace the cap tightly. Invert the vial gently several times to mix the contents (The vial will become hot during mixing!) and digest the vials for 120 minutes in the reactor at a temperature of 150°C.
4. Remove the vials from the reactor and allow them to cool down to 60°C or less. Mix the contents by inverting each vial several times while still warm. Then allow the vials to cool to ambient temperature before measuring.
3:Results
|
Sample |
COD reading (mg/L) |
|
Leachate |
216 |
|
Factory |
423 |
|
River water |
11 |
|
Paddy field water |
19 |
Based on the information given, please make a CONCLUSION.
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