1. What is Saturated Dissolved Oxygen?

Definition: Saturated Dissolved Oxygen refers to the maximum concentration of oxygen that water can hold at a given temperature, pressure, and salinity.

Purpose: It's a critical parameter in water quality assessment and aquatic ecosystem studies.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \text{SDO} \) — Saturated Dissolved Oxygen (kg/m³)
• \( D \) — Oxygen Deficit (kg/m³)
• \( \text{ADO} \) — Actual Dissolved Oxygen (kg/m³)

Explanation: The oxygen deficit is added to the actual dissolved oxygen to determine the saturated dissolved oxygen level.

3. Importance of Saturated Dissolved Oxygen

Details: Measuring SDO helps in understanding water quality, assessing aquatic habitat suitability, and monitoring wastewater treatment processes.

4. Using the Calculator

Tips: Enter the oxygen deficit and actual dissolved oxygen values in kg/m³. Both values must be ≥ 0.

5. Frequently Asked Questions (FAQ)

Q1: What is oxygen deficit in water?
A: Oxygen deficit is the difference between the saturated dissolved oxygen and the actual dissolved oxygen in water.

Q2: What factors affect saturated dissolved oxygen?
A: Temperature, salinity, atmospheric pressure, and water movement all affect SDO levels.

Q3: Why is SDO important for aquatic life?
A: Most aquatic organisms require oxygen for respiration, and SDO levels indicate how much oxygen is available.

Q4: What are typical SDO values in natural waters?
A: In freshwater at 20°C, SDO is typically around 0.009 kg/m³ (9 mg/L), but this decreases with higher temperatures and salinity.

Q5: How is actual dissolved oxygen measured?
A: ADO can be measured using Winkler titration, electrochemical probes, or optical sensors.