Water is the source of life. Human beings cannot live without water in their life and production activities. The quality of drinking water is closely related to human health. With the improvement of social and economic development, scientific progress, and people’s living standards, people’s water quality requirements for drinking water continue to increase, and drinking water quality standards have been continuously developed and improved accordingly. Since the formulation of drinking water quality standards is related to various factors such as people’s living habits, culture, economic conditions, scientific and technological development level, water resources and water quality status, not only among countries, but also between different regions of the same country, There are differences in the requirements for drinking water quality. examination range Filmino Instruments (Shanghai) Co., Ltd. is a new type of scientific research enterprise located in the Caohejing New Technology Development Zone in Shanghai. In 2012, the company obtained the agency rights of Environ Lab&Tech Inc.USA in the South China region, and officially became the distributor of the southern China region. The company's main products are currently sold by the United States Anno laboratory developed by the BOD differential pressure tester, solid waste toxic leaching equipment (TCLP) and handheld oil measuring instrument (OILTECH121). At the same time, it also supervised the on-line water quality monitoring equipment produced by Germany's Lar (LAR), such as online Toxalarm Analyzer and on-line BOD analyzer.
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2 detection purpose
Drinking water mainly considers the impact on human health. Besides water quality standards, physical indicators and chemical indicators, there are microbiological indicators; for industrial water, whether it affects product quality or prone to damage to containers and pipelines is considered.
3 detection indicators
1. Chromaticity: Most people can perceive if the color of drinking water is greater than 15 degrees, and people feel sick when they are greater than 30 degrees. The standard specifies that the color of drinking water should not exceed 15 degrees.
2. Turbidity: It is an expression of the optical properties of water samples. It is used to indicate the degree of clearness and turbidity of water. It is one of the most important indicators to measure the degree of good water quality. It is also to assess the efficiency of water treatment equipment purification and evaluate water treatment. The important basis of the state of technology. The reduction of turbidity means that the content of microorganisms such as organic substances, bacteria, and viruses in the water body is reduced. This will not only improve the disinfection and sterilization effect, but also help to reduce the amount of halogenated organic compounds generated.
3, smell and taste: The generation of water odor is mainly the presence of organic matter, which may be due to the increase of biological activity or industrial pollution. Changes in the normal odor of the public water supply may be a sign of a change in raw water quality or insufficient water treatment.
4. Residual chlorine: Residual chlorine refers to the amount of chlorine remaining in the water after being contacted with chlorinated water for a certain period of time. Continuous bactericidal capacity in water prevents self-contamination of the water supply pipeline and ensures water quality.
5. Chemical oxygen demand: refers to the amount of oxygen needed by chemical oxidants to oxidize organic pollutants in water. The higher the chemical oxygen demand, the more organic contaminants in the water. The organic pollutants in water mainly come from the discharge of domestic sewage or industrial wastewater, and the inflow of aquatic plants and animals into the water body after decomposition.
6, the total number of bacteria: bacteria contained in the water, from the air, soil, sewage, garbage and animal and plant corpse, the type of bacteria in the water is varied, including pathogens. The standard for drinking water in our country is that the total number of bacteria in 1 ml of water should not exceed 100.
7. Total coliform: It is an indicator of fecal contamination. The condition detected from it can indicate whether there is fecal contamination in the water and its degree of contamination. In the purification process of water, after disinfection, the total coliform group 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.
8, heat-resistant coliform bacteria: It is more appropriate than the coliform bacteria to reflect the extent of food contamination by humans and animal faeces, but also an indicator of contamination of water faeces.
9. Escherichia coli: E. coli is a representative bacterium of the genus Escherichia. In general, it is not pathogenic. It is the resident bacteria in the intestinal tract of humans and animals and can cause extraintestinal infection under certain conditions. Certain serotype strains are highly pathogenic, causing diarrhea and collectively known as pathogenic E. coli. Enterobacteriaceae are a group of G-bacilli with similar biological traits. They live in the gut of humans and animals. Escherichia is one of a class of bacteria, including a variety of bacteria, with E. coli being the most common clinically. E. coli is known as E. coli and 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 organism. On the other hand, it can suppress the excessive proliferation of spoilage bacteria and pathogenic bacteria and fungi. However, when they leave the parasitic part of the intestine and enter other parts of the body, they can cause the infection. Some strains are pathogenic and cause intestinal or urinary tract infections. In short, E. coli = E. coli. 
