2. Methods
2.1 Equipment
Apparatus: Materials:
15 250ml Beakers Duckweed (about 150)
1 Oxygen sensor 2 cans of Pesticides
1 Datalogger 1 bottle of Oil (to simulate bad water quality)
Water
2.2 Diagram
Title: Description of procedures for different setups
2.3 Procedures
1. Prepare 3 sets of 5 containers of water with different water quality
a: pure water (200ml), (control)
b: pure water (200ml), ph level 7.4, One spray of Pesticides (acceptable)
c: pure water (200 ml), ph level 5, 2 Sprays of pesticides, 20 ml oil (slightly polluted)
d: pure water (200ml), ph level 4, 3 sprays pesticides, 50 ml of oil, 20ml of detergent
(quite polluted)
e: pure water (200ml), ph level 2-3, 5 sprays of pesticides, 70 ml of oil, 30ml of detergent
(extremely polluted)
2. Place same number of duckweed into containers (10 each) with a spoon.
3. Monitor growth every 2 days by counting the number of duckweeds and taking photographs to see the spreading of the duckweed. This will help to see if the plants are growing well or dying.
4. Fill in the table and plot graphs every 2 days according to the number of duckweed. If the quality of water is poorer and the number of duckweeds in it decrease, our hypothesis is right.
2.4 Risk Assessment and Management
Risk of falling
At the end of the experiment we must disposed the water containing chemicals properly so as to prevent unwanted exposure or contact with the chemicals.
Risks of breathing in the poisonous insecticide as well as breaking the beakers which we will be keeping the duckweeds in.
We should never return excess chemicals to the stock container to prevent contamination of the stock solutions/solids so as to preserve its
If there are any breakages, leakages and accidents we must immediately inform the teacher and/or technician and avoid contact with the chemicals to prevent the chemicals from harming us.
2.5 Data Analysis
Table 1 : Growth of Duckweed in Different Water types
Graph 1 : Growth of Duckweed
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