There are nearly a thousand kinds.
In the process of interior decoration, VOC mainly comes from paints, coatings and adhesives.
According to reports, the indoor TVOC concentration is usually between 0.2mg/m3 and 2mg/m3, which can even be dozens of times higher in the case of improper decoration and construction.
Many indoor aromatic hydrocarbons and alkanes mainly come from automobile exhaust (76%-92%).
The TVOC content of general lacquer cloth is 0.4-65438 0.mg/m3.
Wan Lili and others point out that TVOC is highly unstable. In general, 90% TVOC can be volatilized within 10 hour after paint application, while TVOC in solvent only releases 25% of the total amount during paint air drying.
Because benzene and benzene series are important components of TVOC, some people only test TVOC and don't test benzene and benzene series; but some people only test total benzene and don't test TVOC; some units test both.
This mainly depends on the requirements and conditions.
TVOC detection requires high technical equipment, usually using gas chromatography, but also using Fourier transform infrared spectrum, fluorescence spectrum, ion chromatography and reflection interference spectrum.
They all appear at the micro and micro levels, so they are easily overlooked.
They mainly come from: organic solutions, such as paints, waterborne coatings, adhesives, cosmetics, detergents, caulking glue, etc.; Building materials: such as wood-based panels, foam insulation materials, plastic plates, etc. Interior decoration materials: decorations such as wallpaper; Fiber materials: such as carpets, tapestries, chemical fiber curtains; Incomplete combustion of domestic fuel and tobacco leaves, human excrement.