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Water quality monitoring is the process of monitoring and measuring the types of pollutants in water, the concentration and changing trends of various pollutants, and the evaluation of water quality. The main monitoring items for water quality monitoring can be divided into two categories: one is a comprehensive indicator reflecting the water quality status, such as temperature, chromaticity, turbidity, pH, conductivity, suspended solids and dissolved oxygen, chemical oxygen demand and biological oxygen demand The other is some toxic substances, such as phenol, cyanide, arsenic, lead, chromium, cadmium, mercury and organic pesticides.
Portable water quality analysis system: suitable for rapid detection of conventional indicators such as residual chlorine, chlorine dioxide, oxygen consumption, total hardness, chromaticity, turbidity, etc. in drinking water and its source water, surface water, and groundwater.
5. Odor: The production of water odor is mainly the existence of organic matter, which may be the manifestation of increased biological activity and industrial pollution. Changes in normal odors in public water supplies can be a signal of changes in raw water quality and inadequate water treatment.
6. Total bacteria: bacteria in water come from air, soil, sewage, garbage and dead bodies of animals and plants. There are many types of bacteria in water, including pathogenic bacteria. China stipulates that the standard of drinking water is that the total number of bacteria in 1 ml of water does not exceed 100.
7. Escherichia coli: coliform bacteria (e). coli is a representative bacterium of the genus Escherichia. Generally not sick, it is a resident bacteria in the intestines of humans and animals and can cause extra-intestinal infections under certain conditions. Some serotype strains are highly pathogenic and cause diarrhea, collectively referred to as pathogenic Escherichia coli. Enterobacteriaceae are a group of G-bacteria with similar biological characteristics, which mostly live in the intestines of humans and animals.
8. Chroma is a sensory indicator. Pure natural water is clear, transparent and colorless, but sewage with colored pollutants such as metal compounds or organic compounds exhibits various colors. Dilute the colored sewage with distilled water and compare it with distilled water in a colorimetric tube until the two water samples have no color difference. At this time, the dilution ratio of the sewage is its chromaticity. Sewage discharge standards also have strict requirements on chroma.
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