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 between 50 ° C and 250 ° C. It can be evaporated in the form of air at room temperature, its toxicity, irritation, carcinogenicity and special odor. Sexuality affects the skin and mucous membranes and causes acute damage to the human body.
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 between 50 ° C and 250 ° C. It can be evaporated in the form of air at room temperature, its toxicity, irritation, carcinogenicity and special odor. Sexuality affects the skin and mucous membranes and causes 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.
Indoor air quality researchers usually refer to all indoor organic gaseous substances they sample and analyze as VOC, which is the abbreviation of the first letter of Volatile Organic Compound. The various measured VOCs are collectively referred to as total volatile organic compounds TVOC. (Total Volatile Organic Compounds).
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, furniture, Detergents and emissions from the body itself. 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.
Because TVOC has strong volatility, in general, 90% of the paint can be volatilized within 10 hours after the paint is applied, and 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 highly demanded, and gas chromatography is usually used.
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, reaction, etc.
Prevention and control measures; to prevent TVOC damage, mainly from the source.
Gas chromatography
Gas Chromatograph Host GC-6210
TVOC special capillary column
Benzene special column
Workstation N-2000
The gas generator
ATDS-3420A automatic thermal desorber
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