-
About JIAYU
-
-
-
Resource Center
-
News Center
-
◉ Introduction to TVOC
TVOC is the English abbreviation of "Total Volatile Organic Compounds", which means total volatile organic compounds.
Indoor air quality researchers usually refer to the indoor organic gaseous substances they sample and analyze as VOC, which is the abbreviation of the first letter of the three words Volatile Organic Compound; various measured VOCs are collectively referred to as total volatile organic compounds TVOC ( Total Volatile Organic Compounds).
TVOC is one of the most serious organic pollutants in the air (polycyclic aromatic hydrocarbons, volatile organic compounds and aldehydes). TVOC refers to an organic substance with a saturated vapor pressure of more than 133,32pa at room temperature, its boiling point is 50℃ to 250℃, and it can exist in the air in the form of evaporation at room temperature. Its toxicity, irritation, carcinogenicity and special odor It can 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 always emphasized that TVOCs are an important class of air pollutants. The United States Environmental Protection Agency (EPA) defines VOCs as carbon-containing compounds other than carbon dioxide, carbonic acid, metal carbides, calcium carbonate, and ammonium carbonate that participate in photochemical reactions in the atmosphere.
◉ TVOC Classification
Benzenes, alkanes, aromatics, alkenes, halocarbons, esters, aldehydes, ketones and others.
◉ Main Components of TVOC
n-hexane, benzene, trichloroethylene, toluene, octene, butyl acetate, ethylbenzene, p-xylene, m-xylene, o-xylene, styrene, nonane, isooctanol, undecane, tetradecane , hexadecane, etc.
◉ TVOC Source
The main sources of TVOC are outdoors, mainly from fuel combustion and transportation; while 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, Emissions from detergents and the human body itself, etc. There are nearly a thousand species. In the interior decoration process, VOCs mainly come from paints, coatings and adhesives. According to reports, the indoor TVOC concentration is usually between 0.2mg/m3 and 2mg/m3, and in improper decoration construction, it can even be dozens of times higher. A variety of indoor aromatic hydrocarbons and alkanes mainly come from automobile exhaust (76%-92%). TVOC content in general paint is 0.4-1.0mg/m3. Due to the strong volatility of TVOC, under normal circumstances, 90% of the paint can be volatilized within 10 hours after the paint is applied, while the TVOC in the solvent only releases 25% of the total amount during the air-drying process of the paint.
Since benzene and benzene series are important components of TVOC, some people only detect TVOC, but not benzene, and benzene series; however, there are also only detection of total benzene, but not TVOC; some units are both. detection. It mainly depends on the requirements and conditions. The technical equipment requirements for TVOC detection are relatively high, and gas chromatography is usually used, but there are also Fourier transform infrared spectroscopy, fluorescence spectroscopy, ion chromatography and reflection interference spectroscopy. They all occur at trace and trace levels, so they are easy to overlook. They mainly come from: organic solutions: such as paints, aqueous coatings, adhesives, cosmetics, detergents, caulks; building materials: such as wood-based panels, foam insulation materials, plastic sheets; interior decoration materials: such as wallpaper, other Decorations, etc.; fibrous materials: such as carpets, tapestries and chemical fiber curtains; incomplete combustion of household fuels and tobacco leaves, human excrement.
◉ Related Standards
"Civil Construction Engineering Indoor Environmental Pollution Control Specification" GB 50325-2020
◉ Compliance Services
As a professional third-party testing and certification service organization, Jiayu Testing has qualifications such as CMA, CNAS, and occupational health technical service institutions. In the field of environmental testing, it currently has more than 1000 CMA testing parameters, covering water and wastewater, air and exhaust gas, soil and sediment, noise and vibration, and solid waste toxicity identification. The laboratory is built and managed strictly in accordance with standards, equipped with advanced instruments and equipment, and has a professional technical team with superb skills. It has rich industry service experience and strong testing technology capabilities. Based on the principles of objectivity and fairness, it provides authoritative testing reports with legal effect to the society, and provides full chain environmental risk management support for enterprises and regulatory departments. Welcome to contact us at 400-9269-886!
Recommended for you
Wechat Public
Account
Hotline
Hotline
Follow
The Public
Follow Us
- Back