curricula water on the web
about us understanding data curricula resources
what's new at wow site map
Search Site
basic science studying
Aquatic Respiration
Chemistry of Oxygen Solubility
Conductivity
Data Interpretation
Diel Temperature Variation in Lakes
Effect of pH
Effect of Photosynthesis and Respiration on Aquatic Chemistry
Fish Stocking Decisions
Heat Budgets of Lakes
Increased Conductivity
Modeling Water Quality
Properties of Water
Rain Storms, Landuse and Lake Turbidity
Sustaining Life Under
the Ice
Thermal Stratification
tutorials
Navigating the
WOW website
Using WOW Data
with Excel
Using WOW
Visualization Tools
 
 
  Respiration in a Microcosm
 

Group Names: ____________________________________________________

Date: _______________________

Test kit instructions need to be followed precisely. (A practice test with water of known DO content and pH may be used before you begin the actual testing.)

You will create a microcosm by adding sediment or fish to water in a bottle. If your teacher has provided chemical reagent test kits you will test the DO and pH after 20 to 30 minutes. If you are using meters to measure DO and pH you will sample every five minutes.

Type of microcosm you are analyzing: ______________________________________

Experimental Design
Add 150 ml of water to your microcosm bottle. Enter your prediction for the initial DO and pH measurements into the table below. Reflect on what you know about DO, pH, and water before making your prediction. Test the DO and pH of your water sample before adding the sediments or fish. (If using test kits, slowly pour water from your microcosm into the test kit bottles, or take a sample with a pipette. Try not to splash the water as you are transferring it to the kit bottles.) Record your measurements in the table below. Then add your sediment or fish to the bottle.

Data Collection
Describe the contents of your microcosm

Sediment: describe

_______________________________

– Or –

Minnows: describe and indicate how many

_______________________________

Predict what will be observed in your next measurements.

 

*Note: A maximum of 30 minutes should be allowed for oxygen and pH changes to develop. This prevents unnecessary minnow mortality.

Test #

Time

Predicted DO

Predicted pH

Measured DO

Measured pH

1

         

2

         
3          

4

         

5

         

Data Management and Analysis

  1. How did your microcosms change?

 

 

 

 

 

Interpretation of Results

  1. Describe the change and provide a reason for its occurrence.

 

 

 

 

 

Reporting Results
Turn in your completed worksheet.

back to top
   
Water on the Web
about us  :  understanding  :  data  :  curricula  :  resources
what’s new  :  site search  :  site map  :  contact us

http://www.waterontheweb.org/curricula/bs/student/aquatic/worksheet1.html
date last updated: Saturday March 06 2004