There are many types of water quality monitoring indicators, according to the nature of the classification can be divided into physical monitoring indicators, chemical monitoring indicators, toxicological indicators and biological monitoring indicators of these four categories.
One, physical monitoring indicators
Physical monitoring indicators refer to the elements that do not involve chemical reactions, parameter determination of water samples do not change. It includes sensory physical monitoring indicators and other physical water quality indicators.
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Sensory physical monitoring indicators means that you can usually use the eyes, nose, tongue and other sensory organs to directly observe the indicators, but also can be used to test laboratory equipment to test, such as: water temperature, color, transparency, turbidity, odor, suspended solids, visible to the naked eye and so on.
●? Other physical water quality indicators are total solids, suspended solids, sinkable solids, conductivity and so on.
Two, chemical monitoring indicators
Chemical monitoring indicators refers to the chemical composition of impurities and pollutants in the water body and the chemical role of the comprehensive indicators. Mainly contains general chemical water quality indicators and oxygen balance indicators.
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General chemical water quality indicators refer to PH, alkalinity, hardness, chloride ions, ammonium ions, nitrate ions, nitrite ions, potassium ions, calcium ions, magnesium ions, sodium ions, total salinity, and general organic matter.
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Oxygen balance index is an important indicator in the evaluation of organic pollution in the water environment, which includes dissolved oxygen (DO), total oxygen consumption (TOD), chemical oxygen consumption (COD), biochemical oxygen consumption (BOD), total organic carbon (TOC) and so on.
Three, toxicological indicators
Toxicological indicators refers to the sewage to reach a certain concentration, able to endanger human health, harm aquatic life in the water body, or affect the biological treatment of sewage substances, such toxic substances is the basis for toxicological indicators to evaluate the quality of water. Here the toxic substance indicators refer to a variety of heavy metals, cyanide, polycyclic aromatic hydrocarbons, a variety of pesticides, etc., such as: arsenic, selenium, mercury, cadmium, chromium, lead, silver, nitrate, chloroform, carbon tetrachloride, DDT, hexachlorobenzene, etc..
Four, biological monitoring indicators
Bio-monitoring indicators are mainly for the monitoring of bacteria, viruses and other pathogens in the water, is to avoid the outbreak of waterborne diseases is an important monitoring indicators, the indicators are mainly to monitor the total number of bacterial colonies, total E. coli, heat-resistant coliforms, free residual chlorine and so on.
The above information on water quality testing, organized by the hundred inspection environmental testing platform, I hope to help you, hope to adopt