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What is the relationship between dissolved oxygen and biochemical oxygen demand and why is it important to monitor both in natural waterways? - HSC - SSCE Chemistry - Question 25 - 2010 - Paper 1
Question 25
What is the relationship between dissolved oxygen and biochemical oxygen demand and why is it important to monitor both in natural waterways?
Worked Solution & Example Answer:What is the relationship between dissolved oxygen and biochemical oxygen demand and why is it important to monitor both in natural waterways? - HSC - SSCE Chemistry - Question 25 - 2010 - Paper 1
Step 1
Relationship between dissolved oxygen and biochemical oxygen demand
Answer
Dissolved oxygen (DO) is the amount of oxygen available in water for aquatic organisms. Biochemical oxygen demand (BOD) measures the amount of oxygen that microorganisms will consume while decomposing organic matter in water.
The relationship lies in the fact that as BOD increases, the demand for oxygen by these microorganisms increases, leading to a potential decrease in DO levels. This relationship is crucial for the survival of aquatic life, as low levels of DO can lead to suffocation of fish and other organisms, creating an imbalance in aquatic ecosystems.
Step 2
Importance of monitoring DO and BOD in natural waterways
Answer
Monitoring DO and BOD is vital for maintaining healthy aquatic environments.
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Ecosystem Health: Regular monitoring helps in assessing the health of aquatic ecosystems. If BOD is high and DO is low, it may indicate pollution, which can lead to problems such as fish kills.
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Water Quality Management: These measurements are essential for water quality management and ensuring compliance with environmental regulations.
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Preventing Eutrophication: Monitoring can help in preventing eutrophication, where excess nutrients lead to algal blooms, further impacting oxygen levels and aquatic life.
In conclusion, monitoring both DO and BOD is essential in preserving the ecological balance and ensuring sustainable use of natural waterways.