TVOC is one of the three types of pollution affecting indoor air quality. TVOC refers to an organic substance with a saturated vapor pressure exceeding 133.32pa at room temperature. Its boiling point is from 50 ° C to 250 ° C. It can be evaporated in the form of air at normal temperature. It is toxic, irritating, carcinogenic and special odor. It will affect the skin and mucous membranes and cause acute damage to the human body. Organizations such as the World Health Organization (WHO) and the National Academy of Sciences/National Research Council (NAS/NRC) have consistently emphasized that TVOC is an important class of air pollutants. The US Environmental Protection Agency (EPA) defines VOCs as carbon-containing compounds that participate in atmospheric photochemical reactions in addition to carbon dioxide, carbonic acid, metal carbides, carbonates, and ammonium carbonate.
Source of TVOC
The main source of TVOC is outdoor, mainly from fuel combustion and transportation: indoors are mainly from combustion products such as coal and natural gas, smoke from smoking, heating and cooking, construction and decoration materials, furniture, household appliances, detergents. And the body's own emissions and so on. There are nearly a thousand. In the interior decoration process, VOC is mainly from paints, coatings and adhesives. It is reported that the indoor TVOC concentration is usually between 0.2mg/m3 and 2mg/m3, and even in the improper decoration construction, it can even be dozens of times higher. Many indoor aromatic hydrocarbons and alkanes are mainly derived from automobile exhaust (76%-92%). The typical paint towel TVOC content is 0.4-1.0 mg/m3. Li Li et al pointed out that because TVOC has strong volatility, in general, 90% of the paint can be volatilized within 10 hours after the construction, while the TVOC in the solvent only releases 25% of the total amount in the paint drying process.
Since benzene and benzene are important components of TVOC, some people only detect TVOC, not benzene, and benzene: however, only total benzene is detected, not TVOC: there are some units, both Detection. This mainly depends on the requirements and conditions. The technical equipment for detecting TVOC is relatively high, and gas chromatography is usually used, but Fourier transform infrared spectroscopy, fluorescence spectroscopy, ion chromatography and reflection interference spectroscopy are also used. They all appear at trace levels and trace levels and are therefore easily overlooked. They are mainly from: organic solutions: such as paints, aqueous coatings, adhesives, cosmetics, detergents, quilting; building materials: such as wood-based panels, foam insulation, plastic sheets; interior materials: such as wallpaper, other Decorations, etc.; fiber materials: such as carpets, tapestries and chemical fiber curtains; incomplete combustion of household fuels and tobacco leaves, human waste.
Edit this paragraph TVOC harm to the human body
TVOC can be odorous, irritating, and some compounds are genotoxic. It is currently believed that TVOC can cause imbalance of immune level, affect central nervous system function, and have symptoms such as dizziness, headache, lethargy, weakness, chest tightness, etc. It may also affect the digestive system, loss of appetite, nausea, etc. In severe cases, it may damage the liver and Hematopoietic system, allergic reactions, etc. It is generally believed that the normal, non-industrial indoor environment TVOC concentration level does not lead to tumors and cancer in the human body. When the TVOC concentration is 3.0-25 mg/m3, it will cause irritation and discomfort. When combined with other factors, headache may occur. When the VOC concentration is greater than 25 mg/m3, other neurotoxic effects may occur in addition to headache. .
Control measures, room air purification, charcoal
Preventing VOC damage, mainly from the source, to prevent non-environmental building materials; secondly, often ventilation, even heating and baking, so that VOC release is accelerated; third, placing bamboo charcoal activated carbon or air purifier with activated carbon; fourth After the decoration, it is best to check that the VOC does not exceed the standard and ventilate for one month. Fifth, place some flowers that can absorb harmful substances, such as spider plant, aloe vera, tigertail orchid, ivy and asparagus. In addition, roses, rhododendrons, tulips, lilies and orangutans can be placed in the living room or courtyard, which can absorb a large number of TVOCs, but they should not be placed in the bedroom because they have other negative factors. How to control TVOC indoor environment treatment TVOC, combined with the status quo, mainly for the treatment of furniture, sheet, paint-treated finish materials, leather, cloth, glue coatings, etc., TVOC air purification liquid is currently the most effective treatment products in Shanghai, Rapidly degrade indoor toxic, harmful gases and germs, no secondary pollution, and long-term effective. The physical and chemical treatment methods are applicable to family residential buildings, office commercial buildings, hospitals, hotels, hotels, etc., and the treatment effect is very satisfactory.
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