Volatile Organic Compounds (VOCs) Semivolatile Organic Compounds. Many of the formed VOCs are produced by microorganisms, and it would be a challenge to investigate soil microbial communities by studying their VOC profile. Volatile organic compounds (VOC) are organic chemical compounds that are highly evaporative and can produce noxious fumes. See 40 C.F.R. Volatile Organic Compound or VOC Testing and Analysis using techniques such as GC-MS. Define Volatile organic compounds. See non-methane volatile organic compounds.Volatile Organic Compounds - Organic compounds that evaporate at room temperatures and are often … Volatile: This term aims to highlight the fact that VOCs have a marked tendency to transit in vapor phase. These compounds can cause harmful effects on chronic exposure. About Volatile Organic Compounds (VOCs) Volatile organic compounds (VOCs) are carbon containing chemicals that vaporize and can enter the body through normal breathing. Of more than 200 compounds identified as MVOCs in laboratory experiments, none can be regarded as exclusively of microbial origin or as specific for certain microbial species. Information and translations of volatile organic compounds in the most comprehensive dictionary definitions resource on the web. These emissions may be reduced by As of 3/31/2009 . Definition for Volatile Organic Compounds (VOCs) October 1999 For fuel storage, all losses from breathing and refilling are to be regarded as Total VOCs emissions. Definition of a Volatile Organic Compound. VOCs are a class of chemicals that are volatile (evaporate easily) and are organic compounds (contain carbon atoms). Microbial volatile organic compounds (MVOCs) are a variety of compounds formed in the metabolism of fungi and bacteria. For use of solvents, paints and other such products, the Total VOCs emissions often are equal to the Total VOCs content of the product. Why TVOC is difficult to define. Some common VOCs include acetone and automotive gasoline. VOCs are categorized by their volatility, which is a complicated chemistry term used to describe the ease with which these substances change states of matter. Because volatile substances readily vaporize, they mix with air and can be smelled (if they have an odor). Furthermore, these cause harmful environmental conditions such as global warming and ozone layer depletion. What Are Volatile Organic Chemicals (VOCs)? By definition, VOCs are a class of chemicals that vaporize easily at normal air temperatures. Volatile organic compounds in the nation's ground water and drinking-water supply wells. They are used as ingredients in paints, cleaning products, and adhesives. Volatile Organic Compounds (VOC for the purpose of this rule means any compound containing at least one atom of carbon, excluding methane, carbon monoxide, carbon dioxide, carbonic acid, metallic carbides or carbonates, ammonium carbonate, and exempt compounds which may be emitted to the atmosphere during the application, drying and curing operations. The list of VOC-exempt compounds is discussed further below. Soils may act as sources or sinks of volatile organic compounds (VOCs). VOCs react with nitrogen oxides – particularly on hot summer days – to form smog. What are Volatile Organic Compounds and how does it impact indoor air quality? The range of products that contain VOCs is very rich, and can include products such as paints, cleaning products, boutique products, adhesives, and much more. Even cosmetics, mothballs, air fresheners, and household cleaning supplies contain VOCs. 51.100 (s). In effect, “any volatile compound of carbon” is classified as a VOC for regulatory purposes, unless specifically exempted. VOCs can come from many sources. Volatile organic compounds (VOCs) are one of the biggest silent threats to human health. Short-term exposure to high levels of some Volatile Organic Compounds (VOC) can cause: breathing problems; irritation of the: eyes; nose; throat; headaches; Some people may be more sensitive, such as people with asthma. definition includes all organic compounds of medium volatility, in a boiling point range of approximately 0-400°C or vapour pressures in the range 0.10-100 kPa. Volatile Organic Compounds (VOC) are chemicals that vaporize (become a gas) at room temperature, and are the leading cause of ground-level air pollution (also known as “smog”). Essentially, these are organic compounds (meaning that they are made primarily out of carbons) that are small and light enough to easily vaporize. The level of volatile organic compounds is two to three times higher indoors than it is outdoors. Osmium tetroxide (OsO 4) is another volatile inorganic compound that, like dry ice, transitions from the solid phase to the vapor phase without becoming a liquid. Semi Volatile Organic Compounds (SVOCs) SVOCs tend to have a higher molecular weight and boiling point than VOCs meaning they are less likely to become a vapour at room temperature. For example, alcohol is volatile. About volatile organic compounds; More information; Health effects. Organic volatile compounds can retain in the atmosphere and enter our systems through inhalation. Common VOCs include acetone, benzene, ethylene glycol, formaldehyde, methylene chloride, perchloroethylene, toluene and xylene. In particular, the Italian law defines as VOC those organic compounds that to 293,15 K are located in gas phase, or that, if they are in liquid phase, have a vapor pressure greater than 0.01 kPa. 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