Subject: Biology | Class: 10 | Project Type: Experimental & Environmental
Aim: To detect and compare pollution levels in different water samples using simple methods.
Materials Required:
3–5 water samples from different sources (e.g., tap, river, pond, rainwater, RO purifier)
Transparent jars or test tubes
Litmus papers (red and blue) or pH strips
Dropper or pipette
TDS meter (if available)
Boiling water (for smell and sediment tests)
Notebook and pen for observations
Optional: microscope (to observe microorganisms), turbidity chart, thermometer
Procedure:
1. Collection of Samples
Label jars as:
Sample A: Tap water
Sample B: Pond water
Sample C: RO water
Sample D: River or rainwater
2. Physical Observation
Observe each sample for:
Color
Smell
Turbidity (clarity)
Presence of sediments or floating particles
3. Litmus or pH Test
Dip red and blue litmus or pH strips into each water sample.
Note color changes to determine acidic, neutral, or basic nature.
4. Boiling Test (Optional)
Boil a small quantity of each sample.
Observe for residue, foam, or strong smell — signs of pollution or salts.
5. TDS Test (if available)
Use a TDS (Total Dissolved Solids) meter to measure impurities in ppm.
High TDS indicates poor water quality.
6. Optional Microbial Test
If you have a microscope, take a drop from each sample and place it on a slide.
Observe presence of algae, bacteria, or fungi.
Observation Table (Example Format):
| Sample | Color | Smell | Turbidity | Litmus/pH | TDS (ppm) | Sediments |
|---|---|---|---|---|---|---|
| Tap | Clear | None | Low | Neutral | 150 | None |
| Pond | Green | Musty | High | Acidic | 450 | Present |
| RO | Clear | None | None | Neutral | 50 | None |
| River | Muddy | Mild | Medium | Slightly acidic | 300 | Few |
Conclusion:
Different sources of water have varying levels of pollution. Pond and river water showed more impurities, turbidity, and possible microbial presence. RO water had the lowest TDS and best quality. Simple tests like pH and turbidity can effectively indicate water quality.
Importance of the Project:
Helps understand real-world environmental issues.
Promotes awareness of safe drinking water.
Encourages citizen science and testing of local resources.
Presentation Ideas:
Include photos of each sample.
Show color change in litmus/pH test with labeled results.
Draw a simple diagram of water purification or pollution sources.