Dissolved oxygen is the measure of
the amount of oxygen carried in a medium. It is needed to survive, or in other
words cellular respiration. Warm water holds less oxygen than cold water.
Moving water has a large amount of dissolved oxygen. To test this, first you
need a pipette and vial. Then, suck up 25mL of tank water to put in the vial.
Next, use the ampoule and place it in the vial to press down and break the
glass tip. The water should turn blue and gently swirl around, then wait about
2 minutes. Now compare your results with the key colors. Less than 3mg/L will
not support fish, while above 5mg/L is perfect. Meg and I had a result of
8mg/L. I think a pond would have a level of 12 because they have a lot of
aquatic life there. A large river might be 14 or higher because moving water
contains more dissolved oxygen.
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