1. What is Actual Dissolved Oxygen?

Definition: Actual Dissolved Oxygen (ADO) is the amount of oxygen present in water, crucial for aquatic life and water quality assessment.

Purpose: This calculator determines the actual dissolved oxygen by subtracting the oxygen deficit from the saturated dissolved oxygen level.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The oxygen deficit is subtracted from the saturated dissolved oxygen level to find the actual amount of oxygen available in the water.

3. Importance of Dissolved Oxygen Measurement

Details: Dissolved oxygen is critical for aquatic ecosystems, wastewater treatment, and industrial processes. Low levels can indicate pollution or poor water quality.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What is saturated dissolved oxygen?
A: It's the maximum oxygen concentration water can hold at given temperature, pressure, and salinity conditions.

Q2: What causes oxygen deficit in water?
A: Oxygen deficit occurs due to biological oxygen demand (BOD), chemical oxidation, and respiration by aquatic organisms.

Q3: What's a healthy dissolved oxygen level?
A: Generally, 5-6 mg/L (0.005-0.006 kg/m³) is needed for most aquatic life, though requirements vary by species.

Q4: How is SDO typically measured?
A: Using a dissolved oxygen meter or Winkler titration method, often with temperature compensation.

Q5: What affects dissolved oxygen levels?
A: Temperature (cold water holds more oxygen), salinity, atmospheric pressure, and biological activity.