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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
Explain the relationship between dissolved oxygen and biochemical oxygen demand
Answer
Dissolved oxygen (DO) and biochemical oxygen demand (BOD) are closely related in aquatic environments. Dissolved oxygen refers to the amount of oxygen present in water, which is essential for the survival of aquatic organisms. On the other hand, biochemical oxygen demand measures the amount of oxygen required by microorganisms to decompose organic matter in water.
When the BOD is high, it indicates that there is a significant amount of organic material that needs to be decomposed, which consumes a larger share of dissolved oxygen. Consequently, if the BOD exceeds the amount of available DO, aquatic life can become stressed or even die due to oxygen depletion.
Step 2
Discuss the importance of monitoring DO and BOD in natural waterways
Answer
Monitoring both dissolved oxygen and biochemical oxygen demand is crucial for maintaining the health of natural waterways. High levels of BOD can lead to significant decreases in DO, harming fish and other aquatic organisms.
Regular monitoring helps in assessing water quality and detecting pollution sources, allowing for timely remediation actions. Additionally, maintaining balanced levels of DO is vital for sustaining biodiversity and ensuring the ecological integrity of aquatic systems.