the effect of substances on dissolved oxygen level
TRANSCRIPT
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Anna KoAnnie AuTim Kind
Jade Chen
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What is the effect of different substances
(elodea, yogurt, dead grass, bar soap, fertilizer)
on the dissolved oxygen level (±0.1 mg/L)
of river water?
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DO levels <5.0 mg/L or >110% stressed aquatic life
Waste product of photosynthesis oxygen
Decay = consumes oxygen
Temperature may affect DO levels
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We predict that the elodea would be the only
factor to increase the dissolved oxygen level in
water whereas the rest of the variables would
decrease the level of dissolved oxygen.
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Independent variable:◦ substance used
Dependent variable:◦ percent change in dissolved oxygen level
Control variables
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Dissolved Oxygen Levels (±0.1 mg/L)
Average Change
(±0.6% mg/L)
Calibrated Change
(±0.6% mg/L)
Initial FinalTrial 1 Trial 2 Trial 3 Trial 1 Trial 2 Trial 3
Control 4.0 3.8 -5.0 0.0Elodea 4.3 4.4 4.1 4.0 3.5 3.0 -18.0 -13.0Yogurt 4.3 4.2 4.3 3.5 2.7 3.0 -22.7 -17.7Dead grass
4.2 4.1 4.2 3.5 3.0 3.4 -20.8 -15.8
Bar soap 4.1 4.3 4.0 3.3 2.8 3.0 -26.6 -21.6Fertilizer 4.3 4.2 4.0 3.7 4.3 3.8 -5.6 -0.6
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Control
Average Percent Change in DO Levels
0.0
-13.0
-17.7
-15.8
-21.6
-0.6
Elodea Dead grass Bar Soap
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Hypothesis – wrong◦ Assumed that elodea will live in river water
All substances decreased DO level
Smallest effect: Fertilizer
Biggest effect: Bar Soap
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DO sensor malfunction inaccuracies
Temperature changes (window)
Holes diffusion of gases/evaporation
The effect of river water on elodea
Time = too long
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Control temperature
Test other living plants
Control diffusion/evaporation rate
Increase frequency of DO-measurement
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Effect on aquatic life
Raise awareness of substances that affect DO levels in water
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http://www.state.ky.us/nrepc/water/wcpdo.htm
http://www.fivecreeks.org/monitor/do.html