With the process of industrialization, the protection and management of water resources has become increasingly important. Among them, the measurement of dissolved oxygen in water quality has become a link that cannot be ignored. Dissolved oxygen is an important indicator of water health, which has a crucial impact on the survival of aquatic organisms, human domestic water and industrial production.
1. The importance of dissolved oxygen measurement in water quality.
Dissolved oxygen refers to oxygen dissolved in water and is one of the important parameters to measure water quality. The content of dissolved oxygen directly affects the living state of aquatic organisms, and is also closely related to the water quality of human domestic water and industrial production water. When the dissolved oxygen in the water body is too low, it will lead to the hypoxia of aquatic organisms, affecting their growth and reproduction; High levels of dissolved oxygen may lead to algal blooms and eutrophication. Therefore, accurate measurement of dissolved oxygen content in water quality is of great significance for the protection and treatment of water resources.
2. Technical means for measuring dissolved oxygen in water quality.
At present, the main technical means of water dissolved oxygen measurement include chemical analysis, electrochemical and optical methods.
Chemical analysis: By adding a chemical reagent to the water sample, it reacts with dissolved oxygen, and then calculates the content of dissolved oxygen according to the concentration of the product after the reaction. Although the method is highly accurate, it is cumbersome, time-consuming, and requires the use of toxic and harmful chemical agents.
Electrochemical method: The redox reaction of dissolved oxygen on the electrode is used to determine its content. This method has the advantages of accurate measurement, easy operation and fast response, so it has been widely used in practice.
Optical method: The dissolved oxygen content is estimated by measuring the optical properties of the water sample (e.g., absorbance, fluorescence intensity, etc.). This method has the advantages of non-contact, non-destructive and fast, but it is greatly affected by the color of water sample, turbidity and other factors, and the measurement accuracy needs to be improved.
3. Application fields of water dissolved oxygen measurement.
Environmental protection: With the increasingly serious environmental problems, water quality monitoring has become an important part of environmental protection work. By accurately measuring the dissolved oxygen content of water quality, it is helpful to assess the health status of water bodies, find pollution sources in time, and provide a scientific basis for environmental governance.
Ecological research: The change of dissolved oxygen content directly affects the survival state of aquatic organisms, and then affects the balance of the entire ecosystem. Through the measurement of dissolved oxygen in water quality, we can gain an in-depth understanding of the ecological habits of aquatic organisms and provide strong support for ecological research.
Production and domestic water: In industrial production and daily life, the quality of water directly affects the quality of production and life. Through the measurement of dissolved oxygen in water quality, the safety and reliability of production and domestic water can be ensured, and various accidents caused by water quality problems can be avoided.
Sewage treatment: The dissolved oxygen content at each stage of the sewage treatment process needs to be monitored to ensure the normal metabolism of microorganisms and the effect of sewage treatment. By measuring dissolved oxygen in water quality, the wastewater treatment process can be optimized and treatment efficiency can be improved.
River governance: River governance is an important means to improve the water environment. Through the measurement of dissolved oxygen in water quality, the effect of river governance can be monitored and a scientific basis can be provided for river governance.