About Dissolved Oxygen
Dissolved oxygen (DO) is the volume of oxygen that is contained in water.
Oxygen has a very low solubility in water, however dissolved oxygen is vital for aquatic animals such as fish, amphibians and aquatic macroinvertebrates.
Oxygen is dissolved into water by transfer from the air/water surface, plants carrying out photosynthesis and through wave action and waterfalls.
Test the dissolved oxygen levels of your water samples if you have access to appropriate equipment. You can also use the virtual experiment to measure dissolved oxygen of virtual water samples using the modified Winkler titration method (pdf – 300 kB).
Record your results (Word 200 kB).
How do your water sample results compare to the ANZECC Water Quality Guidelines? (Assume the sample is from an upland river.)
