4. Discussion

3.1 Analysis of results
This experiment has shown us that water plants are able to absorb salt (Our pollutant). This can be seen from our result, for 2g of salt, on Day 1 our average was 5.7 ppt. There is a decrease on Day 4, when our average is 5.5 ppt. However, there is an abnormal increase of 0.1 ppt on Day 2. This might be the cause of the plants trying to adapt to the environment. This resulted in them releasing some salt to adapt to the water’s environment. Our evaluation of results is that water plants do affect the salinity levels of water.

3.2 Key findings

Our key finding is that as the time passes, the amount of salt concentration drops. This means that the plants have absorbed the salt in the water. This shows that the plants are able to filter pollutants in the water.

Based on our data, when the amount of salt in each container increases, the amount of salt decreased is greater. The containers with the least amount of salt had almost no change when compared to the salt concentration in the beginning of the experiment. However, there was an anomaly there the salt concentration increased for the containers with lesser salt. Osmosis is a process that causes the salt concentration in the plant and the water to be the same. Our results show that not all water plants can affect the quality of water. Only plants like the Eichhornia crassipes can absorb pollutants from the water. Some water plants may die if they are placed in a lot of polluted water.

3.3 Explanation of key findings

The reason why the salt concentration in the containers that has a higher salt concentration is that when the plants absorb the salt, the difference in the results will be more significant compared to the containers with lower salt concentration. However, with the anomaly, where the salt concentration increased rapidly before dropping again, we have come to a conclusion about it after researching. Osmosis is a process that causes the salt concentration in the plant and the water to be the same.

3.4 Evaluation of Hypothesis 

After carrying out our final experimentation, our hypothesis and results do not match in the context of the results we collected. One of the reasons that can be used to understand why our hypothesis is different from our results is that the evaporation of the water has cause the concentration levels of the salt to increase. We can further improve our hypothesis by considering other factors contributing to the experiment such as the evaporation of the water and osmosis. Another reason for why our hypothesis did not match our final conclusion is that it could also be due to the type of plants we used and they depend on the characteristics of the plant on whether it is able to absorb salt.

3.5 Areas for improvement 

An area of improvement is to observe the factors that could affect the final results during the course of the experiment. This will help us cut down the time that we used to conduct our experiment, thus allowing us to have more time to complete our final report, research on the anomaly surfaced and completion of data analysis. We should also pay more attention to independent and dependent variables in our experiment and make changes to the setups where necessary. 

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