VOCs

一、Core Definitions and Classifications
Broad definition: Any organic liquid or solid that can volatilize at normal temperature and pressure can be classified as VOCs.
Narrowly defined: In the field of environmental protection, it usually refers to organic compounds that participate in atmospheric photochemical reactions (excluding non reactive organic compounds such as methane), which form ozone (O?)
Important precursors of fine particulate matter (PM2.5).
Common types
Aromatic hydrocarbons: benzene, toluene, xylene
Alkanes: propane, n-hexane
Alkenes: ethylene, propylene
Aldehydes and ketones: formaldehyde, acetaldehyde, acetone
Esters: ethyl acetate, butyl acetate
二、Main sources
The sources of VOCs are divided into natural sources and anthropogenic sources, among which anthropogenic sources are the focus of environmental control:
Natural sources: plant emissions (such as terpenes), forest fires, microbial activity, etc., usually dispersed and at low concentrations.
Artificial source
Industrial sources: emissions from production processes such as petrochemicals, painting, printing, pharmaceuticals, rubber and plastic processing, etc.
Life sources: automobile exhaust, volatilization of furniture and decoration materials (paint, adhesives), catering fumes, detergent use, etc.
Agricultural sources: pesticide spraying, straw burning, etc.
三、harm
Harm to the environment
Participate in atmospheric photochemical reactions, generating pollutants such as ozone and secondary aerosols, exacerbating haze and photochemical smog pollution.
Some VOCs have persistence and bioaccumulation, which can contaminate soil and water bodies.
Harm to human body
Short term exposure: irritates the eyes, nose, and respiratory tract, causing discomfort such as headache, nausea, and fatigue.
Long term exposure: Some substances, such as benzene and formaldehyde, have carcinogenic, teratogenic, and mutagenic effects, damaging the liver, kidneys, and nervous system.
四、Related control standards and requirements
Various countries and regions have implemented strict control measures for VOCs, with core directions including:
Source control: Limit the VOCs content in products, such as low VOCs standards for coatings and adhesives.
Process control: Enterprises are required to adopt closed production, waste gas collection and treatment processes to reduce unorganized emissions.
End of pipe treatment: Through adsorption, combustion, catalytic oxidation and other technologies, the collected VOCs waste gas is treated and discharged after meeting the standards.
Common standards: China's "Unorganized Emission Control Standards for Volatile Organic Compounds" (GB 37822), the European Union's Solvent Emission Directive (SED), etc.
五、Related to the standards you previously focused on
In compliance systems such as RoHS and REACH, some VOCs (such as formaldehyde and benzene) are included in the scope of hazardous substance control, especially in electronic appliances, toys, and furnitureWaiting for the product.
While meeting the requirements of ISO 9001 quality system, enterprises also need to comply with VOCs related environmental regulations to achieve dual compliance of quality and environmental protection.

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