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Struggling with low aquaculture yields? Facing inefficient wastewater treatment? Dealing with industrial effluent exceeding discharge standards? In many cases, the root cause may lie in insufficient dissolved oxygen (DO) levels. As a key indicator for aquatic life survival and water self-purification capacity, dissolved oxygen measurement has become a focal point across multiple industries.

Currently, three main approaches exist for measuring dissolved oxygen:

• The traditional chemical analysis titration method
• The widely used electrochemical membrane electrode method
• The emerging optical fluorescence method

The membrane electrode method has become the most widely adopted solution due to its convenience, real-time measurement capability, and relatively low cost. Based on electrochemical principles, this technique uses specialized electrodes to detect dissolved oxygen concentration, enabling rapid measurements.

The fluorescence method demonstrates significant potential with its unique advantages. This technology utilizes oxygen-sensitive fluorescent materials, measuring changes in fluorescence intensity to calculate dissolved oxygen levels. Key benefits include:

• No oxygen consumption during measurement
• High measurement accuracy
• Low maintenance requirements

These characteristics make the fluorescence method particularly suitable for applications demanding high precision.

While requiring more complex procedures, the traditional titration method remains valuable in specific applications. As a classic chemical analysis technique, it provides accurate and reliable results, often serving as the reference standard for calibrating other measurement methods.

The optimal dissolved oxygen measurement method depends on multiple factors:

• Application requirements
• Measurement precision needs
• Budget constraints
• Operational convenience

Understanding the strengths and limitations of each technique enables informed decision-making for effective water quality management.