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Results 1 - 10 from 33 for chlorine atoms in 0.396 sec.

COPA - PCBs and Superfund in Bloomington, Indiana
The sorption and retention of PCBs by soils and soil constituents are influenced by the number of chlorine atoms in the molecule; the more highly chlorinated derivatives are more tenaciously held. The Koc can be estimated from the water solubility of a PCB. The higher-chlorinated isomers are preferentially sorbed to the organic matter of ...
www.copa.org

Faq
About HFCs What are the HFCs ?   The HFCs (hydrofluorocarbons) are a family of hydrocarbons containing one or several fluorine atoms. The main difference with the CFCs is that these molecules contain no chlorine atoms and thus have no ozone-depleting potential. Members of this family of compounds have the appropriate thermodynamic properties to be used as ...
fluorocarbons.org

Science - Ozone Depletion
The chlorine atoms within them are released and directly attack ozone. In the process of destroying ozone, ... depleting ozone in the stratosphere. The figure shows a simplified cycle of reactions in which chlorine (Cl) destroys ozone (O3). http://www.ozonelayer.noaa.gov/science/o3depletion.htm Last updated on ...
www.ozonelayer.noaa.gov

Science - The Antarctic Ozone Hole
The ozone hole is formed each year in the Southern Hemisphere spring (September-November) ... 1996, the atmospheric concentration of some of these man-made substances has begun to decline. Chlorine/bromine should reach maximum levels in the stratosphere in the first few years of the ...
www.ozonelayer.noaa.gov More from this site

Numbering Scheme for Ozone-Depleting Substances and their Substitutes | Ozone Layer Depletion | US EPA
PFC is a special prefix meaning "perfluorocarbon". "Per" means "all," so perfluorocarbons have all bonds occupied by fluorine atoms. Finally, halons are a general term for compounds that contain C, F, Cl, H, and bromine (atomic ... But in this case, there are no bonds left over after F and H, so there are no chlorine atoms. Thus: HFC-134a = C 2H 2F 4 In this case, too, the prefix is accurate: this ...
epa.gov

Reports to the Nation on Our Changing Planet: Our Ozone Shield
CFCs therefore carried millions of tons of extra chlorine atoms into the stratosphere, adding much more than the amount of ... the problem. Researchers also began watching the ozone layer more closely, searching for evidence that chlorine pollution had already started weakening the protective shield. they knew it might be difficult to ...
www.ogp.noaa.gov

Ozone Depletion | Chlorofluorcarbons | CFCs | Stratospheric Ozone
They contain fluorine atoms, carbon atoms and chlorine atoms. The 5 main CFCs include CFC-11 (trichlorofluoromethane - CFCl3), CFC-12 (dichloro- ... emissions of CFCs have fallen dramatically as a result of the Montreal Protocol, because each chlorine molecule remains in the atmosphere for such a long time, damage done to stratospheric ozone ...
www.ozone-hole.org.uk

Bleaching of kraft pulp
(Cl 2) is an effective delignifying agent. As it breaks lignin bonds, it adds chlorine atoms to the lignin degradation products, thus producing significant amounts of chlorinated organic material. Ozone (O ... this problem and have allowed mills to take advantage of this cost-effective bleaching agent. Chlorine dioxide (ClO 2) is a highly selective chemical that can both delignify and brighten pulp. ...
rfu.org

Ozone: Good Up High, Bad Nearby
GOOD UP HIGH What is Ozone? Ozone is a gas that forms in the atmosphere when 3 atoms of oxygen are combined (03). It is not emitted directly into the air, but at ground level is ... are broken down by the intensity of the sun's ultraviolet rays and release chlorine and bromine molecules, which destroy "good" ozone. One chlorine or bromine molecule can destroy 100,000 ozone molecules, causing ozone to ...
www.policyalmanac.org

Terms Beginning With "I"
Ion: An electrically charged atom or group of atoms. Ion Exchange Treatment: A common water-softening method often found on a large scale at water ... single high level exposure, or chronic from repeated low-level exposures to such compounds as chlorine, nitrogen dioxide, and nitric acid. Isoconcentration: More than one sample point exhibiting the same isolate ...
epa.gov