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Water quality analysis and testing reference project

Water quality analysis and testing reference project


  Most people can detect the color of drinking water if it is greater than 15 degrees, and people are disgusted when it is greater than 30 degrees. The standard specifies that the color of drinking water should not exceed 15 degrees.


  It is an expression of the optical properties of water samples, which is used to indicate the degree of clarity and turbidity of water. It is one of the most important indicators for measuring the goodness of water quality. It is also an important basis for assessing the purification efficiency of water treatment equipment and evaluating the state of water treatment technology. . The decrease of turbidity means that the content of microorganisms such as organic matter, bacteria and viruses in the water body is reduced, which not only improves the disinfection and sterilization effect, but also reduces the amount of halogenated organic matter.


  The production of water odor is mainly the presence of organic matter, which may be caused by an increase in biological activity or industrial pollution. The change in the normal odor of public water supply may be a sign of a change in raw water quality or inadequate water treatment.

  Residual chlorine

  Residual chlorine refers to the amount of chlorine remaining in the water after being chlorinated and chlorinated for a certain period of time. The continuous bactericidal ability in the water can prevent the self-contamination of the water supply pipeline and ensure the water quality of the water supply.


  Refers to the amount of oxygen required by a chemical oxidant to oxidize organic contaminants in water. The higher the chemical oxygen demand, the more organic pollutants in the water. Organic pollutants in water are mainly derived from the discharge of domestic sewage or industrial wastewater, and the inflow of water into the body after decomposition of animals and plants.

  Total number of bacteria

  The bacteria contained in the water are derived from the bodies of air, soil, sewage, garbage, animals and plants. The types of bacteria in the water are various, including pathogenic bacteria. The standard for drinking water in China is that the total number of bacteria in 1 ml of water does not exceed 100.

  Total coliform

  It is an indicator of fecal contamination. The condition detected from it can indicate whether there is any fecal pollution and its pollution level in the water. In the purification process of water, after the disinfection treatment, the total coliform index can meet the requirements of drinking water standards, indicating that other pathogens are basically killed. The standard is no more than 3 / L in the test.

  Heat-resistant coliform

  It is more responsive to coliform bacteria than to the extent to which food is contaminated by human and animal waste, and is also an indicator of water faecal contamination.

  Escherichia coli bacteria (E. coli) is a representative strain of the genus Escherichia. Generally, it does not cause disease. It is a resident bacteria in the intestines of humans and animals. Under certain conditions, it can cause intestinal infection. Some serotype strains are highly pathogenic and cause diarrhea, collectively referred to as pathogenic E. coli. Enterobacter is a group of G-bacilli with similar biological traits, which are mostly found in the intestines of humans and animals. Escherichia is one of a variety of bacteria, and Escherichia coli is the most common clinically. E. coli, commonly known as Escherichia coli, is a normal parasite in the large intestine of all mammals. On the one hand, it can synthesize vitamin B and K for absorption and utilization by the body. On the other hand, it can inhibit excessive proliferation of spoilage bacteria and pathogenic bacteria and fungi. However, when they leave the parasite of the intestine and enter other parts of the body, they can cause infection. Some bacterial types are pathogenic and cause intestinal or urinary tract infections. In short, Escherichia coli = E. coli.