How to Measure Dissolved Oxygen

The video tutorial explains the importance of dissolved oxygen for aquatic life, such as fish and oysters, and how its absence defines dead zones. It demonstrates how to test for dissolved oxygen using a test tab and a sensor, highlighting the significance of maintaining balanced oxygen levels to prevent algae overgrowth and ensure healthy ecosystems. The tutorial concludes with a practical demonstration of measuring dissolved oxygen levels, emphasizing the importance of this knowledge for environmental monitoring.

Why is dissolved oxygen crucial for aquatic animals like fish?

• It helps them breathe through their gills.

• It provides them with food.

• It keeps the water warm.

• It helps them reproduce.

What is the first step in testing for dissolved oxygen in water?

• Compare the sample to a color chart.

• Add a test tab to the water.

• Fill a test tube with sample water.

• Mix the sample for 4 minutes.

What does a reading of 4 PPM of dissolved oxygen indicate?

• There is too much oxygen in the water.

• There is a moderate amount of oxygen in the water.

• There is no oxygen in the water.

• The water is unsafe for aquatic life.

How can excessive algae growth affect dissolved oxygen levels?

• It increases oxygen levels.

• It has no effect on oxygen levels.

• It depletes oxygen levels, affecting fish.

• It makes the water clearer.

What does a high reading of dissolved oxygen using a sensor suggest?

• The water is too cold.

• There are many decomposers in the water.

• There are many living organisms in the water.

• The water is polluted.