Organic compounds that evaporate readily into the atmosphere at normal temperatures. VOCs contribute significantly to photochemical smog production and certain health problems. See non-methane volatile organic compounds.
Organic compounds that volatilize slowly at standard temperature (20 degrees C and 1 atm pressure).
Source: Terms of the Environment
Complex molecules organized around skeletons of carbon atoms arranged in rings or chains; includes biomolecules, molecules synthesized by living organisms.
Organic Compounds: A large group of chemical compounds containing mainly carbon, hydrogen, nitrogen, and oxygen. All living organisms are made up of organic compounds.
Organic compounds made up of atoms of carbon, chlorine (Cl2), and fluorine (F2). An example is CFC-12 (CCl2F2), used as a refrigerant in refrigerators and air conditioners and as a foam blowing agent.
~ that have the ability to draw ion from their water solutions into soluble complexes.
Chemical Oxygen Demand (COD) ...
~ that have a relatively neutral pH (are neither acid nor base), complex structure and, due to their carbon bases, are easily absorbed into the environment. Naphthalene, pyrene and trichlorobenzene are examples of neutrals.
~; sulfate (SO42-) is an inorganic radical.
radionuclide. Any man-made or natural element which emits
radiation in the form of alpha or beta particles, or as gamma ...
~ containing one or more halogens substituted for hydrogen. The resulting substituted compound is generally less flammable but more toxic.
Volatile organic compounds have a carbon concentration and, in the main, vaporise into the atmosphere, where they play a part in smog formation. The greenhouse gas methane is one example of a VOC.
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Volatile Organic Compounds (VOCs): VOCs are manufactured as secondary petrochemicals. They include light alcohol's, acetone, trichloroethylene, perchloroethylene, dichloroethylene, benzene, vinyl chloride, toluene and methylene chloride.
Volatile organic compounds (VOCs) have affected groundwater locally throughout the United States. Many VOCs are carcinogenic ; thus, their presence in groundwater creates a serious problem for water suppliers.
Thiols Organic compounds which contain the "-SH" functional group. Also called mercaptans.
Total dissolved solids (TDS) is the amount of dissolved matter in the water.
volatile organic compounds (VOCs)
VOC is the collective name given to pollutants that are gases at room temperature and which contain carbon as the primary element. VOCs are found in and released from products such as building materials, cosmetics, household cleaners and electrical equipment.
Phenols: Organic compounds that are byproducts of petroleum refining, tanning, and textile, dye, and resin manufacturing. Low concentrations cause taste and odor problems in water; higher concentrations can kill aquatic life and humans.
Volatile Organic Compounds (VOC) - Organic compounds that evaporate at room temperatures and are often hazardous to human health, causing poor indoor air quality. Sources of VOC's include solvents and paints.
Volatile organic compounds (VOCs)
substances such as solvents that are liquid at room temperature, but vaporise significantly and take part in the generation of ozone pollution in the lower atmosphere ...
Volatile organic compounds Any compound of carbon, excluding carbon monoxide, carbon dioxide, carbonic acid, metallic carbides or carbonates, and ammonium carbonate, that participates in reactions of radiant energy, especially light, in the atmosphere.
Volatile Organic Compounds (VOC) (D):
A VOC is any organic compound which participates in atmospheric photochemical reactions; a precursor to ground-level ozone formation.
Volatile organic compounds (VOCs)
Organic compounds that evaporate readily into the air. VOCs include substances such as benzene, toluene, methylene chloride, and methyl chloroform.
Other glossaries and dictionaries:
Environmental Protection Agency
National Library of Medicine (NIH) ...
Volatile Organic Compounds (VOCs): Compounds that evaporate from the many housekeeping, maintenance, and building products made with organic chemicals. These compounds are released from products that are being used and that are in storage.
Volatile Organic Compounds (VOCs)
Pollutants that can irritate the respiratory tract irritation and cause illness. Some VOCs (e.g. benzene) can cause cancer. VOCs also help form ground-level ozone (O3) by reacting with NOx when it's sunny and warm.
Volatile organic compounds (VOCs)
Substances containing carbon and different proportions of other elements such as hydrogen, oxygen, fluorine, chlorine, bromine, sulfur, or nitrogen; these substances easily become vapors or gases.
Volatile organic compounds (VOCs) are carbon compounds that participate in atmospheric photochemical reactions (excluding carbon monoxide, carbon dioxide, carbonic acid, metallic carbides and carbonates, and ammonium carbonate). The compounds vaporize (become a gas) at normal room temperatures.2.
Semivolatile Organic Compounds: Organic compounds that volatilize slowly at standard temperature (20 degrees C and 1 atm pressure).
Hydrocarbon: Organic compounds that are built of carbon and hydrogen atoms and are often used in petroleum industries.
Hydroelectric plant: Electric power plant in which the energy of falling water is used to spin a turbine generator to produce electricity.
Volatile Organic Compounds, which consist of carbon, oxygen, nitrogen, chlorine and other atoms which easily produce gases. The organic solvents that are used in industry and at home are examples of VOCs. They help to produce ground-level ozone and "smog".
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chlororganic Organic compounds combined with chlorine. These compounds generally originate from, or associated with, life processes such as those of algae in water.
Aerobic Treatment Process by which microbes decompose complex organic compounds in the presence of oxygen and use the liberated energy for reproduction and growth. Aerosol Suspended droplets of liquid or fine solid particles in air.
Most people use the terms "hydrocarbon" and "volatile organic compounds" (or VOCs) to mean the same thing.
Chlorofluorocarbons (CFCs) Organic compounds made up of atoms of carbon, chlorine, and fluorine. An example is CFC-12 (CCl2F2), used as a refrigerant in refrigerators and air conditioners and as a foam blowing agent.
alcohol Any class of ~ containing the hydroxyl group, OH. Specifically, the term is applied to ethyl alcohol (C2H5OH). algaecide chemical agent added to water to destroy algae.
VOC Paints and Products: Volatile ~ (VOC) are found in many paints and other products. VOCs are emitted as gases from certain room temperature solids and liquids.
The top layer removes ~ which could include dangerous disinfection by-products as well as those with taste and odor. The space between sand particles is larger than the smallest suspended particles, so simple filtration is not enough.
Phytoalexins Complex ~ produced by plants in response to infection and that are inhibitors of further growth by the pathogen. Phytophagous Feeding on plant material. Placental mammal Mammals which develop a persistent placenta, i.e.
Fluorocarbons (FCs)- Any of a number of ~ analogous to hydrocarbons in which one or more hydrogen atoms are replaced by fluorine. Once used in the United States as a propellant for domestic aerosols, they are now found mainly in coolants and some industrial processes.
Amount concentration of oxygen taken up through the respiratory activity of micro-organisms growing on ~ present when incubated at a specified temperature (usually 20° C) for a fixed period (usually 5 days).
Iron and ~ (often referred to as 'coffee rock') are prominent within the horizon and the ~ are distributed as streaks, patches or lumps. Humosesquic is used as a (Bhs horizon) definition for the Podosol Order in the Australian Soil Classification (Isbell, 2002).
Inorganic compounds (e.g., NH3, NO2-, S2, and Fe2+) are oxidized directly (without using sunlight) to yield energy. This metabolic mode also requires energy for CO2 reduction, like photosynthesis, but no lipid-mediated processes are involved.
Hazardous ~ are converted to ash, carbon dioxide, and water. Burning destroys organics, reduces the volume of waste, and vaporizes water and other liquids the wastes may contain.
Capable of deriving energy for life processes only from the decomposition of ~ and incapable of using inorganic compounds as sole sources of energy or for organic synthesis. See also autotrophic.
honeycomb frost ...
A substance that easily combines with ~.
The passage of a liquid from a weak solution to a more concentrated solution across a semipermeable membrane that allows passage of the solvent (water) but not the dissolved solids.
The process by which green plants use light to synthesize ~ from carbon dioxide and water. In the process oxygen and water are released. Increased levels of carbon dioxide can increase net photosynthesis in some plants. Plants create a very important reservoir for carbon dioxide.
Phloem: vascular tissue in a plant that transports sugar and other ~ throughout a plant
Phytoplankton: microscopic plants floating in the water column
Pioneer-phase Species: species that are able to invade and colonize disturbed areas during early stages of succession ...
The problem is that small engines emit disproportionately large amounts of carbon monoxide, volatile ~ and nitrogen oxides that contribute to smog.
biodegradable - Capable of being broken down by living organisms into inorganic compounds.
bioindicators - Organisms that are used to detect changes in environmental pollutant levels, such organisms are usually sensitive to changes in their surroundings.
Carbon Flux: carbon movement; movement of ~ through an ecosystem. Specifically, the relationship between carbon dioxide absorbed by green plants and carbon dioxide respirated by various organisms.
Carbon Sinks: sites that soak up carbon (forests).
NMVOC = non-methane volatile ~
NMVOC emissions = chemicals other than methane that contain carbon, including alcohols, aldehydes, alkanes, aromatics, halocarbons and ketones
NO = nitric oxide ...
Organochlorines are ~ that contain chlorine. many are pesticides. They are are relatively persistent and accumulate in food chains, some are suspect carcinogens, and all produce dioxins when burnt.
Activated Carbon Filter: Water treatment process to remove taste, odor, some ~, and radon.
Adsorption: retention of a substance by soil particles.
Aerobic: in the presence of or requiring oxygen.
autotroph: An organism that synthesizes its biochemical constituents using simple inorganic compounds and an external source of energy to drive the process. See also primary producer, photoautotroph, and chemoautotroph.
At ground-level ozone is a secondary pollutant formed by the action of sunlight on primary pollutants; these are nitrogen oxides from vehicle emissions and industry and volatile ~ from vehicles, solvents and industry.
An Overview, Greenhouse Effect, Acid Deposition (Acid Rain), Ozone - Stratospheric and Ground-Level, Carbon Dioxide, Sulphur Oxides, Methane, Nitrogen Oxides, Volatile ~, Chlorofluorocarbons and Halons, Energy Efficiency, Policy Instruments, Glossary, Renewable Energy ...
The forms include nitrate, nitrite, ammonia, organic nitrogen (in the form of plant material or other ~), and phosphates (orthophosphate and others). Nitrate is the most common form of nitrogen and phosphates are the most common forms of phosphorus found in natural waters.
The mixture of gases produced from the anaerobic breakdown of organic material in landfill. Typically consists of 50-60% methane (CH4), 30-40% carbon dioxide (CO2), 10% nitrogen (N2), small amounts of other volatile ~ (VOCs).
This is particularly important in flooded situations, where restricted movement of gases could allow toxic ~ to accumulate. Poor aeration is often indicated by plant adaptations that allow them to survive under poorly aerated conditions.
NAEI National Atmospheric Emissions Inventory NECD National Emission Ceiling Directive NFR Nomenclature for Reporting NIEA Northern Ireland Environment Agency NMVOC Non-Methane Volatile ~
Air pollutants are often grouped in categories for ease in classification. Some of these categories are solids, sulfur compounds, volatile ~, particulate matter, nitrogen compounds, oxygen compounds, halogen compounds, radioactive compounds and odors.
See also: What is the meaning of Compounds, Compound, Organic, Organic compound, Environment?