What does the parameter Biochemical Oxygen Demand (BOD) measure in water quality testing?
Answer and explanation
Correct answer: A. Amount of dissolved oxygen needed by aerobic microorganisms to decompose organic matter
- Step 1: Microorganisms consume dissolved oxygen as they break down organic biodegradable pollutants. Step 2. BOD measures the quantity of oxygen consumed over 5 days at 20 deg C, serving as a key indicator of organic water pollution. Answer: Amount of dissolved oxygen needed by aerobic microorganisms to decompose organic matter. Why not the others: Heavy metals are measured by atomic absorption; dissolved mineral solids is TDS; available oxygen for fish is DO (Dissolved Oxygen).
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