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4.4 Water pollution


Here are experiments our science specialists have selected to support the IB* topic.

Watershed Testing

Experiment #20 from Biology with Vernier

In this experiment, you will

  • Use a Dissolved Oxygen, Temperature, Conductivity, and pH Probe to make on-site measurements.
  • Calculate the water quality based on your findings.


Water Monitoring

Experiment #19 from Investigating Biology through Inquiry

In this Preliminary Activity, you will gain experience using a Dissolved Oxygen Probe while measuring the concentration of dissolved oxygen (DO) in a water sample provided by your teacher. You will also gain experience using a Temperature Probe, a Conductivity Probe, and a pH Sensor. You may or may not choose to use all four of the sensors as you subsequently research your chosen question.

After completing the Preliminary Activity, you will first use reference sources to find out more about water issues before you choose and investigate a researchable question that involves long-term data collection. Some topics to consider in your reference search are:

  • water
  • water resources
  • water quality
  • water pollution
  • eutrophication
  • dissolved oxygen (DO)
  • pH
  • total dissolved solids

Educational Standard
International Baccalaureate (IB)
Environmental Systems and Societies
4. Water and aquatic food production systems and societies

* The IB Diploma Program is an official program of the International Baccalaureate Organization (IBO) which authorizes schools to offer it. The material available here has been developed independently of the IBO and is not endorsed by it.