Compounds

Organic compounds that volatilize slowly at standard temperature (20 degrees C and 1 atm pressure). Source: Terms of the Environment ...

Compounds: Two or more different elements held together in fixed proportions by attractive forces called chemical bonds. Concentrate: The totality of different substances that are left behind in a filter medium after filtration.

compounds by organisms; includes biodegradation. black water. Liquid and solid human body waste and the carriage water generated through toilet usage.

Compounds Substances containing two or more elements that are combined chemically. Comprehensive Environmental Response, Compensation, and Liability Act ...

Compounds added to every standard, blank, matrix spike, matrix spike duplicate, sample (for volatile), and sample extract (for semivolatile) at a known concentration prior to analysis.

Lead Compounds Compounds of lead - a heavy metal that is hazardous to health if breathed or swallowed. Its use in gasoline, paints, and plumbing compounds has been sharply restricted or eliminated by federal laws and regulations.

buffer compounds, soil The clay, organic matter, and materials such as carbonates and phosphates that enable the soil to resist appreciable change in pH. complexe tampon Source: Research Branch, 1976 Contact: Peter Schut ...

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.

Organic Compounds: Compounds composed of carbon and hydrogen. Organic compounds form the basic building blocks of living tissue. Organic: Referring to or derived from living organisms. In chemistry, organic refers to any compound containing carbon.

ORGANIC COMPOUNDS: Chemicals that contain carbon. Volatile organic compounds vaporize at room temperature and pressure. They are found in many indoor sources, including many common household products and building materials.

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: Compounds or molecules containing carbon bound to hydrogen; these are far more prevalent than inorganic compounds and make up all living matter.

phenolic compounds Organic compounds that are derivatives of benzene. phenology The study of the periodic phenomena of nature, especially animal and plant life in their relations to weather and climate, e.g.

- Odorous compounds - Glossaries/Terms Welcome to Atmospheric Emission & Environmental Odour Laboratory - Services and Information Centre ...

Some of the compounds in rainforest plants are also used to treat malaria, heart disease, bronchitis, hypertension, rheumatism, diabetes, muscle tension, arthritis, glaucoma, dysentery and tuberculosis, among other health problems.

Semivolatile Compounds: Compounds amenable to analysis by extraction of the sample with an organic solvent. Used synonymously with Base/Neutral/Acid (BNA) compounds.

Volatile Organic Compounds (VOC) Characteristics: Volatile organic compounds (VOC) are a principal component in atmospheric reactions that form ozone and other photochemical oxidants.

Volatile Organic Compounds, chemicals that contain carbon and commonly also contain hydrogen, oxygen and other elements. The prefix "volatile" means that the compound evaporates rapidly. Most industrial solvents are volatile.

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, ...

Volatile organic compounds (VOCs) -- Organic chemicals all contain the element carbon (C); organic chemicals are the basic chemicals found in living things and in products derived from living things, such as coal, ...

Volatile organic compounds (VOCs) Organic compounds that evaporate readily into the air. VOCs include substances such as benzene, toluene, methylene chloride, and methyl chloroform.

Organic Chemicals/Compounds: Naturally occuring (animal or plant-produced or synthetic) substances containing mainly carbon, hydrogen, nitrogen, and oxygen.

organic chemicals/compounds : Animal or plant-produced substances containing mainly carbon, hydrogen, nitrogen, and oxygen. organic matter : Carbonaceous waste contained in plant or animal matter and originating from domestic or industrial sources.

Organic: Refers to compounds containing carbon. Oxidation: The removal of electrons from an element or compound. Oxidation-Reduction: A chemical reaction in which one or more electrons are transferred from one atom or molecule to another.

Carbonates Chemical compounds related to carbon dioxide. Chelating agents Organic compounds that have the ability to draw ion from their water solutions into soluble complexes.

Acid Rain Rain or any form of precipitation of dilute solutions of strong mineral acids, created by the mixing in the atmosphere of pollutants, typically sulfur dioxide and nitrogen oxides compounds, with naturally occurring oxygen and water vapor.

A chemical complexing (forming or joining together) of metallic cations (such as copper) with certain organic compounds, such as EDTA (ethylene diamine tetracetic acid). Chelation is used to prevent the precipitation of metals (copper).

Spodosols Soils with alluvial accumulations of amorphous materials (organic matter and compounds of aluminum and usually iron) in subsurface horizons.

Scientists use the term organic to mean those chemical compounds which are based on carbon. Permeability The property of permitting liquids or gases to pass through. A highly permeable soil, such as sand, allows a liquid to pass through quickly.

Carbon filtering: Charcoal, a form of carbon with a high surface area, adsorbs many compounds including some toxic compounds. Water passing through activated charcoal is common in household water filters and fish tanks.

Hazardous Air Pollutant (HAP) -- One of 189 substances and compounds for which EPA is establishing "maximum achievable control technology" standards.

There is extensive evidence showing that chlorine originating from a class of synthetic compounds, the chlorofluorocarbons (CFCs), is responsible for the destruction of the ozone layer.

degradation Chemical or biological breakdown of a complex compound into simpler compounds. degrees of calcium carbonate concentrationCalcium carbonate concentration is commonly expressed as degrees.

Many are decomposers which obtain nutrients needed for survival by breaking down complex organic compounds in the tissues of living or dead organisms into simpler inorganic nutrient compounds.

Air pollutants are often grouped in categories for ease in classification; some of the categories of air pollutants are: solids, sulfur compounds, volatile organic chemicals, particulate matter, nitrogen compounds, oxygen compounds, ...

Mercury exists in three forms: as pure metallic mercury; in inorganic compounds such as mercuric chloride; and in organic compounds such as methylmercury, which is the most toxic.

transient tracers Chemical elements (often radioactive) or compounds that have finite lifetimes. Atmospheric testing of nuclear weapons from the mid-1950s to the early 1960s released large quantities of radionuclides to the atmosphere.

Acid rain: This is the wet form of a complex chemical and atmospheric phenomenon called acid deposition, which occurs when emissions of sulfur and nitrogen compounds and other substances are transformed by chemical processes in the atmosphere.

Volatile organic compounds are merely organic compounds that evaporate easily. VOCs include a wide range of compounds, notably gasoline, diesel fuel, various types of alcohol and solvents.

hydrochloroflourocarbon (HCFC) One of a class of compounds used primarily as a CFC substitute. Work on CFC alternatives began in the late 1970s after the first warnings of CFC damage to stratospheric ozone.

Exclusive of pollen, fog, and dust, which are of natural origin, about 100 contaminants have been identified and fall into the following categories: solids, sulfur compounds, volatile organic chemicals, nitrogen compounds, oxygen compounds, ...

Fluorocarbons (FCs): Any of a number of organic compounds analogous to hydrocarbons in which one or more hydrogen atoms are replaced by fluorine.

Ozone is destroyed mainly by chlorine-based compounds, chlorofluorocarbons (CFCs), and chlorinated solvents such as carbon tetrachloride, as well as the fire-extinguishing chemicals, halons.

chlorofluorocarbons (CFCs) - stable, artificially-created chemical compounds containing carbon, chlorine, fluorine and sometimes hydrogen.

Acid Deposition: A complex chemical and atmospheric phenomenon that occurs when emissions of sulfur and nitrogen compounds and other substances are transformed by chemical processes in the atmosphere, often far from the original sources, ...

Decompose: To separate into simpler compounds, substances or elements. Deep percolation. The percolation of surface water through the ground beyond the lower limit of the root zone of plants into a groundwater aquifer.

A substance that easily combines with organic compounds. Osmosis 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.

Physical properties of compounds reflect the nature of the interactions among their molecules. Audience/Time Grades 8 - 12 two 55-minute class periods ...

Activated Carbon Filter: Water treatment process to remove taste, odor, some organic compounds, and radon. Adsorption: retention of a substance by soil particles. Aerobic: in the presence of or requiring oxygen.

Phloem: vascular tissue in a plant that transports sugar and other organic compounds throughout a plant Phytoplankton: microscopic plants floating in the water column ...

Montreal Protocol (on Substances that Deplete the Ozone Layer): International agreement that entered into force in January 1989 to phase out the use of ozone-depleting compounds such as methyl chloroform, carbon tetrachloride, and CFCs.

Plastic - A material made from petroleum capable of being molded, extruded, or cast into various shapes. There are many different kinds of plastic made from different combinations of compounds.

The chemical reaction on the surface of a coin, caused by exposure to air, dampness, industrial fumes, or other elements capable of reacting with oxygen. The resultant oxide compounds can create a tarnished, or otherwise undesirable, appearance. Term ...

In the case of some non-CFC ozone-depleting substances, the US has recently fought for a high number of exemptions for certain compounds (notably, the pesticide methyl bromide).

The principal greenhouse gases are: carbon dioxide; methane; nitrous oxide; hydroflurocarbons (in fact a group of compounds rather than a single one); sulphur hexafluoride; perfluorocarbons (again more than one compound).

See also: Environment, Water, Environmental, Air, Organic