Can the dissolved oxygen analyzer solve the problem of dissolved oxygen detection?
The molecular oxygen dissolved in the air in the water is called dissolved oxygen, and the content of dissolved oxygen in the water is closely related to the partial pressure of oxygen in the air and the temperature of the water. Under natural conditions, the oxygen content in the air does not change much, so the water temperature is the main factor. The lower the water temperature, the higher the dissolved oxygen content in the water. Molecular oxygen dissolved in water is called dissolved oxygen, usually recorded as DO, expressed in milligrams of oxygen per liter of water. The amount of dissolved oxygen in water is an index to measure the self-purification ability of water body.
Dissolved oxygen is closely related to the partial pressure of oxygen in the air, atmospheric pressure, water temperature and water quality. At 20°C and 100kPa, the dissolved oxygen in pure water is about 9mg/L. Some organic compounds biodegrade under the action of aerobic bacteria, consuming dissolved oxygen in water. If the organic matter is calculated by carbon, according to C+O2=CO2, it can be known that every 12g of carbon consumes 32g of oxygen. When the dissolved oxygen value in the water drops to 5 mg/L, some fish have difficulty breathing.
Dissolved oxygen usually has two sources: one source is when the dissolved oxygen in the water is not saturated, the oxygen in the atmosphere seeps into the water body; the other source is the oxygen released by the plants in the water through photosynthesis. Therefore, the dissolved oxygen in the water will be continuously replenished due to the incorporation of oxygen in the air and the photosynthesis of green aquatic plants. However, when the water body is polluted by organic matter, the oxygen consumption is serious, and the dissolved oxygen cannot be replenished in time, the anaerobic bacteria in the water body will multiply quickly, and the organic matter will deteriorate, which will make the water body black and smelly.
The dissolved oxygen value is a basis for studying the self-purification ability of water. The dissolved oxygen in the water is consumed, and it takes a short time to return to the original state, indicating that the water body has a strong self-purification ability, or the water body is not seriously polluted. Otherwise, it means that the water body is seriously polluted, the self-purification ability is weak, or even loses the self-purification ability.
Based on this, we can easily solve the problem of measuring the dissolved oxygen value in water by using a portable dissolved oxygen analyzer.
The portable dissolved oxygen analyzer is a high-performance portable measuring instrument, which is used to measure the concentration of oxygen content in aqueous solution. The detection of low-concentration dissolved oxygen in water is widely used in petrochemical, electric power, beverage, pharmaceutical and semiconductor industries.
