Author: McAslan, Elizabeth

The Changing Water Quality of the Stoney Run Stream
Caroline Gosse, Kennedy Manley, Ruby McAslan, and Emma Sunderland.

Methods
To collect data for dissolved oxygen, fill a bottle with water from the stream and make sure no air bubbles are present.
Then, 8 drops of Manganous Sulfate Solution was added to the bottle and inverted to mix it.
After the solution settled, 8 drops of Sulfuric acid was added to the bottle.
The bottle was inverted again until the solution turned to a clear yellow.
Then the titration tube was filled to the 20 mL line and the titrator was pulled until full.
Next, 8 drops of Starch indicator solution was added to the bottle.
Finally, the titrator liquid was slowly added, drop by drop, and the titration tube was swirled every few drops until the solution turned clear.
The amount of liquid left in the titrator is the amount of dissolved oxygen in the water.
The pH was taken in the stream using a pH measurer.
The temperature was taken in degrees Celsius in the stream using a thermometer as well.
To collect the ablative cover data, the average ablative cover was taken every day, and then averaged together after a couple of weeks.
Data Analysis
The pH and dissolved oxygen graph shows how the dissolved oxygen decreases as the pH increases.
The temperature and dissolved oxygen graph shows how dissolved oxygen decreases as temperature increases.
The ablative cover and dissolved oxygen graph shows how dissolved oxygen decreases as ablative cover increases.
The pH graph is not accurate because as pH increases, dissolved oxygen should increase as well.
The temperature graph is not accurate because as temperature increases, dissolved oxygen should increase.
The ablative cover graph is not accurate because as ablative cover increases, dissolved oxygen should increase.
To change each of these graphs to make them more accurate, the negative slope must be changed to a positive slope.
Model Analysis
To model the data, the sliders of the independent values (Ablative cover, pH, and temperature) move to change the dependent value (dissolved oxygen)
Yes, the program was a good predictor, however the numbers used were not completely accurate. Therefore, the program did its job correctly but with unreliable numbers.
Future work
The data was collected in the same location and collected in the same manner because both groups were given the same instructions.
To make the data more reliable, a very specific square foot of water should have been selected for where to collect the data.

Conclusion
As dissolved oxygen levels increase, ablative cover decreases.
As dissolved oxygen levels increase, pH levels decrease.
As dissolved oxygen levels increase, temperature decreases.
These observations did not make sense because the levels should have changed more drastically as the seasons changed.
This data can be used to make predictions about future seasons because ablative cover, temperature, and pH levels can be predicted due to seasonal trends.
The data is reproducible because the seasons usually provide general trend information.

How does ablative cover, temperature, and pH affect dissolved oxygen amounts in the Stony Run Stream and the season changes?