environmental impact

Appropriate dissolved oxygen is essential for good water quality, as all forms of life require oxygen. The natural process of stream water purification requires an appropriate oxygen content to supply aerobic life forms. If the oxygen content in water is below 5.0mg/L, aquatic organisms will have difficulty surviving, and the lower the concentration, the more difficult it is. If the oxygen content is below 1-2mg/L and lasts for several hours, it will cause a large number of aquatic organisms to die.

Application scenarios

Dissolved oxygen electrodes can be used to measure and monitor processes where oxygen content can affect reaction rate, process efficiency, or the environment, such as aquaculture, biological reactions, environmental testing, water/wastewater treatment, and wine production.

temperature compensation

For standard dissolved oxygen measurement, temperature affects the solubility and diffusion rate of oxygen, therefore temperature compensation is necessary.

Salinity correction

The presence of dissolved salts limits the amount of oxygen that can be dissolved in water. The relationship between oxygen concentration and partial pressure varies with the salinity of each sample solution, so most instrument manufacturers provide manual adjustment of salinity to correct changes caused by different ion concentrations.

biochemical oxygen demand

BOD testing is generally used in sewage treatment plants, and water treatment plants need to know the amount of oxygen consumed from water when microorganisms decompose organic matter, which is important. This test allows water treatment plants to determine the effectiveness of water treatment or the amount of pollution still present. The relative oxygen demand of wastewater, effluent, and sewage can be determined by measuring the oxygen content dissolved in the sample at the beginning and end of a specific cultivation period. By measuring the dissolved oxygen at time 1 and subtracting the dissolved oxygen at time 2; Multiply this value by the final sample volume and divide by the initial sample volume to calculate BOD.