Oxygen Levels in Lake vs Other Water

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Oxygen Levels in Lake vs Other Water

Post  Admin on Tue Jan 25, 2011 6:33 am

What factors effect oxygen levels in water.
Chem: Temperature & density
Bio: Location
Physics: Pressure

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Pictures for the experiment

Post  Aislinn on Tue Feb 01, 2011 7:29 pm




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Chem

Post  Admin on Wed Feb 02, 2011 7:22 am

Research Question
Does temperature effect dissolved oxygen content in water ?

Variables
Independent variable- temperature (°C)
Dependant variable- amount of dissolved Oxygen (mg/ L)
Control- tap water

Constants

Same amount of water in each sample
All samples heated for the same amount of time
All trials repeated the same number of times

Hypothesis

If the temperature of lake water is increased, then the dissolved oxygen level will decrease because it is an open system and oxygen content will be lost in the form of steam.

Materials
Sample of tap water and lake water (2000 mL of each)
dissolved oxygen probe
Temperature probe
apparatus with clamp
hot plate
two 2000 mL flasks
parafilm
six 300 mL beakers
a Vernier Lab Quest
a computer with logger pro software.

Procedure
Collect 2000 mL samples of lake water and tap water in two separate flasks .
Covering with parafilm, let sit over night so both samples reach room temperature.
Pour 200 mL of lake water into a separate beaker.
Turn on the lab quest and allow it to warm up for about 5-10 minutes.
The lab quest should be connected both to the temperature probe and the dissolved oxygen probe, as well as a computer with logger pro.
With a temperature probe, measure the initial temperature( in °C) of the 200 mL sample .
Turn on the hot plate and allow it to warm up.
Place a dissolved oxygen probe in the 200 mL sample and measure the initial amount of dissolved oxygen (in mg/L) in the sample.
9. Using an apparatus (reference attached photo), position the temperature probe and the dissolved oxygen probe so that they can both measure temperature and dissolved oxygen content of the sample during heating.
10. Place the 200 mL sample of lake water on the hot plate.
As the sample heats, The temperature probe and the dissolved oxygen probe should now be directly recording the temperature change and change in dissolved oxygen to logger pro through the lab quest
Save and analyze data, record any observations
Repeat steps 3-12 for a total of five completed trials
Repeat steps 3-12, this time substituting lake water for tap water. Complete a total of five trials for the tap water as well.

Initial Data
Initial temperature of lake water: 66.7ºF or 19.3ºC
Temperature after sitting over two nights or 19ºC
Initial temperature of tap water: 70.8ºF or 21.5ºC
Temperature after sitting over two nights 19ºC
Initial Temperature of Lake water = 20.5 ºC
Initial Oxygen Level of Lake Water = 5.3 mg/L


Lake Water Trial One

Dissolved Oxygen
- Minimum of 3.96
Maximum of 6.01
Mean is 4.60
Standard Deviation is ± 0.50
Slope 0.007529 mg/L/s
Temperature
Minimum of 22.0
Maximum of 29.3
Mean is 30.3
Standard Deviation is ±5.33
Took 361 samples every three minutes
Slope 0.1021 degrees Celsius/ s

Lake Water Trial 2

Dissolved Oxygen
Minimum is 4.02
Maximum is 5.81
Mean is 4.75
Standard Deviation is ±0.491
Slope is 0.007127 mg/L/s
Temperature
Minimum of 23.4
Maximum of 40.7
Mean is 31.6
Standard deviation is ±5.46
Slope is 0.1044 degrees celsius/s

Lake Water Trial 3

Dissolved Oxygen
Minimum is 4.16
Maximum is 5.50
Mean is 4.65
Standard Deviation is ±0.412
Slope is 0.006316 mg/L/s
Temperature
Minimum of 22.1
Maximum of 39.74
Mean is 30.6
Standard deviation is ±5.52
Slope is 0.1054 degrees celsius

Lake Water Trial 4

Dissolved Oxygen
Minimum is 4.17
Maximum is 5.95
Mean is 5.12
Standard Deviation is ±0.52
Slope is 0.008607 mg/l/s
Temperature
Minimum of 24.7
Maximum of 43.4
Mean is 34.5
Standard deviation is ±5.37
Slope is 0.1026

Lake Water Trial 5

Dissolved Oxygen
Minimum is 4.02
Maximum is 6.19
Mean is 4.94
Standard Deviation is ±0.465
Slope is 0.007579 mg/l/s
Temperature
Minimum of 22.7
Maximum of 39.8
Mean is 30.9
Standard deviation is ±5.18
Slope is .09918



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Chem Presentation

Post  Admin on Thu Feb 03, 2011 6:45 am

Research Question, Variables, Constants, Hypothesis- Aislinn +Chloe
Materials, Lab Setup- Alex+Amanda
Procedure- Namwan+Zhuoting
Data
~Basic Results- Ari
~ Analysis & Comparison- Andrea
Errors-Dennis
Reflection- Jas


Last edited by Admin on Tue Feb 08, 2011 7:40 am; edited 2 times in total

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Bio Presentation

Post  Admin on Thu Feb 03, 2011 7:52 am

Research Question, Variables, Hypothesis- Cady & Ali
Materials, Lab Setup- Lucie & Melina
Procedure- Jas
Data
Basic Results- Jun Soo & Clint
Analysis (relating to society)- Charlie & Lianna
Errors- Arie *Amanda
Reflection- Jon

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