Dissolved oxygen (DO) is an important component of drinking water and affects the quality and safety of the water we consume. It refers to the amount of oxygen present in the water, which is vital for the survival of aquatic organisms and also plays an important role in the purification process of water treatment.
Dissolved Oxygen And Drinking Water
Dissolved oxygen is the amount of oxygen dissolved in water. It is one of the most important indicators of good water quality. Water with the right amount of DO is usually cleaner because oxygen helps inhibit the growth of anaerobic bacteria, which can cause water deterioration and odors. It helps to oxidize organic and certain inorganic materials in the water, helping to remove impurities and improve water quality.
Hazards Of Low Dissolved Oxygen
- Microbial reproduction: If the dissolved oxygen in the water is too low, the reproduction of anaerobic microorganisms (e.g., certain bacteria) may increase, and the metabolites of these microorganisms may lead to deterioration of the water quality and the production of off-flavors.
- Insufficient oxidation: When dissolved oxygen is too low, there is insufficient oxidation in the water, which may result in ineffective removal of some harmful substances.
Importance Of Dissolved Oxygen For Drinking Water
Water Quality Indicators: Higher dissolved oxygen levels usually indicate clean and healthy water. Conversely, low levels may indicate the presence of pollution or organic matter, which can lead to bacterial growth and waterborne disease.
Effect on taste and odor: The right amount of dissolved oxygen contributes to the freshness and taste of drinking water. Low oxygen levels may result in unpleasant tastes and smells.
Role in Water Treatment: During water treatment, dissolved oxygen is essential for oxidizing contaminants and the survival of beneficial bacteria that help break down organic matter.
Sources of Dissolved Oxygen Affecting Drinking Water
- Atmospheric diffusion
- Photosynthesis
- Land clearing
- Deforestation
- Sewage waste
- Agricultural and urban runoff
- Channel changes
Dissolved Oxygen Measurement Level
Dissolved oxygen levels are usually measured in milligrams per liter (mg/L). Acceptable levels of dissolved oxygen for drinking water are usually between 6 and 8 mg/L to ensure that the water is healthy and safe.
How to Measure Dissolved Oxygen in Drinking Water?
Dissolved Oxygen Meter
- Calibrate the instrument: Before using the dissolved oxygen meter, it first needs to be calibrated according to the manufacturer’s instructions to ensure the accuracy of the instrument. Calibration is usually done in air or using a standard oxygen solution.
- Take a water sample: Immerse the probe of the instrument in a sample of drinking water, making sure that the probe is in full contact with the water body.
- Read the result: The instrument will automatically display the dissolved oxygen concentration in the water sample, usually in milligrams per liter (mg/L).
Traditional methods of measuring dissolved oxygen are complicated and require specialized laboratories and personnel. But now, with the Apure A20 digital optical do meter, even ordinary people can easily measure the dissolved oxygen content of drinking water at home. Our highly intelligent and flexible instrument can measure pH/ORP value and temperature at the same time, with high measurement accuracy and easy operation.
Chemical Titration (e.g. Winkler Titration)
This is the traditional laboratory method for measuring the amount of dissolved oxygen in water, and although not as convenient as modern instruments, it is still widely used, especially in the absence of electronic instruments.
Luminescent Dissolved Oxygen Sensor
This method uses an optical sensor to measure dissolved oxygen in water. The sensor utilizes the response of fluorescent material to oxygen to measure the oxygen concentration and is one of the more advanced technologies.
Summary
Drinking water is an important resource for human survival and its quality is directly related to our health. Dissolved oxygen, as an important indicator of water quality, is of great significance to both aquatic ecosystems and human health.
Apure water quality monitoring instruments are accurate, stable and reliable, with a wide range of product lines to meet the individual needs of different customers. In addition to dissolved oxygen meter, we also have ph /orp meters, flow meters, level meters, temperature measurement and ozone generators. Welcome to contact us to customize a professional water quality monitoring solution for you.