Why is COD preferred over BOD ?

Explanation

### Step-by-Step Solution

1. **Definition of COD and BOD**:
- **COD (Chemical Oxygen Demand)**: It is a measure of the total amount of oxygen required to chemically oxidize both organic and inorganic substances in water or wastewater. This means it accounts for all chemicals present in the sample.
- **BOD (Biological Oxygen Demand)**: It measures the amount of oxygen required by bacteria to biologically degrade organic matter in water or wastewater. It primarily focuses on organic pollutants.

2. **Scope of Measurement**:
- COD measures both organic and inorganic substances, providing a comprehensive assessment of water quality.
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