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PM2.5 detection
Source: Spectrum detection Author: Sales Department published on: 2015-12-06 11:00:00

PM2.5 (particulate matter 2.5) refers to the particulate matter with diameter less than or equal to 2.5 μ m in the atmosphere, also known as pulmonary particulate matter. Its radius is less than 1 / 400 of the thickness of human hair. Although PM2.5 is only a small part of the earth's atmosphere, it has an important impact on air quality and visibility. In February 2013, the Chinese name of PM2.5 was named as fine particulate matter by the national science and technology term Approval Committee. The chemical composition of fine particles mainly includes organic carbon (OC), elemental carbon (EC), nitrate, sulfate, ammonium salt, sodium salt (Na +).

 Environmental PM2.5 detection

The history of PM2.5

Main sources of PM2.5 production It is the residue discharged from combustion in the process of daily power generation, industrial production and automobile exhaust emission, mostly containing toxic substances such as heavy metals.

Generally speaking, coarse particles with particle size of 2.5-10 μ m mainly come from road dust, wind sand, industrial and agricultural activities and other mechanical processes; The primary particulate matter in PM2.5 (particulate matter directly discharged into the atmosphere) mainly comes from the fly ash produced by fossil fuel combustion and biomass combustion, as well as a variety of inorganic and organic compounds, such as vehicle exhaust, coal combustion, volatile organic compounds, forest wildfire, etc.; the secondary particles (indirectly generated particles) in PM2.5 mainly come from gaseous substances (sulfur dioxide, nitrogen oxides) in the atmosphere (such as ammonium sulfate particles, ammonium nitrate particles, organic compound particles, etc.) formed by chemical reaction. In most parts of the world, the proportion of secondary sources of PM2.5 is higher than that of primary sources.

Suspended particle refers to the fine solid or liquid suspended in the gas. Inhalable particulate matter and total suspended particulate matter (TSP) in daily or weekly reports of urban air quality are two familiar air pollutants. Inhalable particulate matter, also known as PM10, refers to particulate matter with diameter ≤ 10 μ m, which can enter human respiratory system. Total suspended particulate matter (TSP) is also known as PM100, i.e. particles with diameter greater than or equal to 100 microns.

For environmental science Suspended particles refer to the fine pollutants in the air, which are a major source of air pollution. Suspended particles less than 10 microns in diameter are defined as respirable suspended particles, which can accumulate in the lungs and endanger human health. Particles less than or equal to 2.5 microns are most harmful to human body because they can enter the alveoli directly. Scientists use PM2.5 to express the amount of such particles per cubic meter of air. The higher the value, the more serious the air pollution.

Fine particles are also called fine particles and fine particles. PM2.5: refers to the ambient air aerodynamic equivalent diameter ≤ 2.5 micron particles, also known as fine particles. It can be suspended in the air for a long time. The higher the content (concentration) in the air, the more serious the air pollution. PM10, also known as PM10, refers to the particles with aerodynamic equivalent diameter ≤ 10 μ M. In the relevant technical standards of occupational hazards, the solid particles that can be suspended in the air for a long time are collectively referred to as "dust".

Although fine particulate matter is only a small component of the earth's atmosphere, it has an important impact on air quality and visibility. Fine particles have small particle size, large specific surface area, strong activity, easy to attach toxic and harmful substances (such as heavy metals, microorganisms, etc.), and stay in the atmosphere for a long time and transport distance, so it has a greater impact on human health and atmospheric environmental quality.

The chemical composition of fine particles mainly includes organic carbon (OC), elemental carbon (EC), nitrate (NO3 -), sulfate (SO42 -), ammonium salt (NH4 +) and sodium salt (Na +).

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