2. Turbidity: an expression of the optical properties of water samples, which is used to indicate the clarity and turbidity of water. It is one of the most important indicators to measure the good degree of water quality, and it is also an important basis for assessing the purification efficiency of water treatment equipment and evaluating the state of water treatment technology. The reduction of turbidity means that the content of microorganisms such as organic matter, bacteria and viruses in water is reduced, which not only improves the disinfection and sterilization effect, but also helps to reduce the generation of halogenated organic substances.
3. Odor and taste: The odor of water is mainly caused by the existence of organic matter, which may be caused by the increase of biological activity or industrial pollution. The change of normal odor in public water supply may be a signal of the change of raw water quality or insufficient water treatment.
4. Visible objects: mainly refer to particles or other suspended substances that exist in water and can be observed by naked eyes.
5. Residual chlorine: Residual chlorine refers to the residual chlorine in water after disinfection with chlorine and contact for a certain period of time. Continuous sterilization ability in water can prevent self-pollution of water supply pipeline and ensure water quality.
The purpose of water quality testing: Drinking water mainly considers the impact on human health, and its water quality standard includes not only physical indicators and chemical indicators, but also microbial indicators. For industrial water, it is necessary to consider whether it will affect product quality or easily damage containers and pipelines.
Refer to Baidu Encyclopedia for water quality testing.