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Dichloromethane: verschil tussen versies

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Regel 1: Regel 1:
 
{{Definition|title=dichloromethane  
 
{{Definition|title=dichloromethane  
  
|definition=Dichloromethane, also known as methylene chloride, is a colourless liquid that has a mild sweet odour, evaporates quickly and does not burn easily.  It is widely used as an industrial solvent and as a paint stripper. It can be found in certain [[aerosol]] and [[pesticide]] products and is used to manufacture photographic film. The chemical may be found in some spray paints, automotive cleaners, and other household products. Methylene chloride does not appear to occur naturally in the environment.  It is made from methane gas or wood alcohol. <ref name="US">[http://www.atsdr.cdc.gov/toxprofiles/tp14.pdf U.S. DEPARTMENT OF HEALTH AND HUMAN SERVICES 2000 TOXICOLOGICAL PROFILE FOR METHYLENE CHLORIDE]</ref>}}
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|definition=Dichloromethane, also known as methylene chloride, is a colourless liquid that has a mild sweet odour, evaporates quickly and does not burn easily.  It is widely used as an industrial solvent and as a paint stripper. It can be found in certain [[aerosol]] and [[pesticide]] products and is used to manufacture photographic film. The chemical may be found in some spray paints, automotive cleaners, and other household products. Methylene chloride does not appear to occur naturally in the environment.  It is made from methane gas or wood alcohol<ref name="US">[http://www.atsdr.cdc.gov/toxprofiles/tp14.pdf U.S. DEPARTMENT OF HEALTH AND HUMAN SERVICES 2000 TOXICOLOGICAL PROFILE FOR METHYLENE CHLORIDE]</ref>. }}
  
 
== Notes ==
 
== Notes ==
Regel 16: Regel 16:
 
|}
 
|}
  
American production grow steadily during the 1970s and early 1980s to reach a peak production of 281.000 tonnes in 1984. Due to a decrease in demand production dropped to 181.000 tonnes in 1994. European production decreased from an estimated 200.000 tonnes in 1984 to 138.000 tonnes in 1996. Environmental emissions in Europe during the 1990s were estimated to be around 44,6 tonnes a year. Most of the methylene chloride released to the environment results from its use as an end product by various industries and the domestic use of aerosol products and paint removers. Due to its high volatility it is mainly released to the air, and to a lesser extent to water and soil. In the atmosphere it is degraded by sunlight and by reactions with other chemicals and has a [[half-life]] between 53 and 127 days. It has a moderate water solubility of 20 g/l and a low tendency to [[adsorption|adsorb]] to particles and sediments. Because of its high volatility dichloromethane is expected to evaporate rapidly from water bodies. It is also degraded in water between 1 and 6 days by reactions with other chemicals or biodegradation by bacteria.
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American production grow steadily during the 1970s and early 1980s to reach a peak production of 281.000 tonnes in 1984. Due to a decrease in demand, production dropped to 181.000 tonnes in 1994. European production decreased from an estimated 200.000 tonnes in 1984 to 138.000 tonnes in 1996. Environmental emissions in Europe during the 1990s were estimated to be around 44,6 tonnes a year. Most of the methylene chloride released to the environment results from its use as an end product by various industries and the domestic use of aerosol products and paint removers.  
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Due to its high [[volatility]] it is mainly released to the air, and to a lesser extent to water and soil. In the atmosphere it is degraded by sunlight and by reactions with other chemicals and has a [[half-life]] between 53 and 127 days. It has a moderate water solubility of 20 g/l and a low tendency to [[adsorption|adsorb]] to particles and sediments. Because of its high volatility dichloromethane is expected to evaporate rapidly from water bodies. It is also degraded in water between 1 and 6 days by reactions with other chemicals or biodegradation by bacteria.
  
It has a very low tendency to [[bioaccumulation|bioaccumulate]] and is therefore not expected to [[biomagnification|biomagnify]] through [[food chain|food chains]].<ref name="US">[http://www.atsdr.cdc.gov/toxprofiles/tp14.pdf U.S. DEPARTMENT OF HEALTH AND HUMAN SERVICES 2000 TOXICOLOGICAL PROFILE FOR METHYLENE CHLORIDE]</ref>
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It has a very low tendency to [[bioaccumulation|bioaccumulate]] and is therefore not expected to [[biomagnification|biomagnify]] through [[food chain|food chains]]<ref name="US">[http://www.atsdr.cdc.gov/toxprofiles/tp14.pdf U.S. DEPARTMENT OF HEALTH AND HUMAN SERVICES 2000 TOXICOLOGICAL PROFILE FOR METHYLENE CHLORIDE]</ref>.
  
Marine fish seem to start dying when exposed to dichloromethane concentrations above 97 mg/l, marine invertebrates at concentrations above 109 mg/l. Marine algae can survive short exposure to dichloromethane concentrations up to 662 mg/l.<ref name = chl>[http://www.eurochlor.org/upload/documents/document79.pdf Euro Chlor February 1999 Euro Chlor Risk Assessment for the Marine Environment OSPARCOM Region - North Sea  Dichloromethane]</ref>
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Dichloromethane concentrations above 97 mg/l and 109 mg/l cause acute [[toxic]] effects to marine fish and marine invertebrates respectively. Marine algae can survive short exposure to dichloromethane concentrations up to 662 mg/l<ref name = chl>[http://www.eurochlor.org/upload/documents/document79.pdf Euro Chlor February 1999 Euro Chlor Risk Assessment for the Marine Environment OSPARCOM Region - North Sea  Dichloromethane]</ref>.
  
It is suspected that dichloromethane in the North Sea might reach concentrations up to 1 µg/l in heavily [[pollution|polluted]] [[coastal area|coastal areas]], although concentrations in polluted [[estuary|estuaries]] typically range around 0,1 µg/l.<ref name = chl>[http://www.eurochlor.org/upload/documents/document79.pdf Euro Chlor February 1999 Euro Chlor Risk Assessment for the Marine Environment OSPARCOM Region - North Sea  Dichloromethane]</ref>
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It is suspected that dichloromethane in the [[North Sea]] might reach concentrations up to 1 µg/l in heavily [[pollution|polluted]] [[coastal area|coastal areas]], although concentrations in polluted [[estuary|estuaries]] typically range around 0,1 µg/l<ref name = chl>[http://www.eurochlor.org/upload/documents/document79.pdf Euro Chlor February 1999 Euro Chlor Risk Assessment for the Marine Environment OSPARCOM Region - North Sea  Dichloromethane]</ref>.
 
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Regel 35: Regel 37:
  
 
==See Also==
 
==See Also==
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[http://www.vliz.be/projects/endis/EDnorth.php?showchemprop=true&showeffects=true&chemeffects=true&chemid=206 Methylenechloride on the ED North Database]
  
 
[http://www.vliz.be/vmdcdata/ecotox/ecotox.php?action=DispChem&ChemID=206 Dichloromethane on the Ecotox Database]  
 
[http://www.vliz.be/vmdcdata/ecotox/ecotox.php?action=DispChem&ChemID=206 Dichloromethane on the Ecotox Database]  

Versie van 2 okt 2009 om 16:21

Definition of dichloromethane:
Dichloromethane, also known as methylene chloride, is a colourless liquid that has a mild sweet odour, evaporates quickly and does not burn easily. It is widely used as an industrial solvent and as a paint stripper. It can be found in certain aerosol and pesticide products and is used to manufacture photographic film. The chemical may be found in some spray paints, automotive cleaners, and other household products. Methylene chloride does not appear to occur naturally in the environment. It is made from methane gas or wood alcohol[1].
This is the common definition for dichloromethane, other definitions can be discussed in the article

Notes

Dichloromethane
Dichloromethane
Formula
CH2Cl2

American production grow steadily during the 1970s and early 1980s to reach a peak production of 281.000 tonnes in 1984. Due to a decrease in demand, production dropped to 181.000 tonnes in 1994. European production decreased from an estimated 200.000 tonnes in 1984 to 138.000 tonnes in 1996. Environmental emissions in Europe during the 1990s were estimated to be around 44,6 tonnes a year. Most of the methylene chloride released to the environment results from its use as an end product by various industries and the domestic use of aerosol products and paint removers.

Due to its high volatility it is mainly released to the air, and to a lesser extent to water and soil. In the atmosphere it is degraded by sunlight and by reactions with other chemicals and has a half-life between 53 and 127 days. It has a moderate water solubility of 20 g/l and a low tendency to adsorb to particles and sediments. Because of its high volatility dichloromethane is expected to evaporate rapidly from water bodies. It is also degraded in water between 1 and 6 days by reactions with other chemicals or biodegradation by bacteria. It has a very low tendency to bioaccumulate and is therefore not expected to biomagnify through food chains[1]. Dichloromethane concentrations above 97 mg/l and 109 mg/l cause acute toxic effects to marine fish and marine invertebrates respectively. Marine algae can survive short exposure to dichloromethane concentrations up to 662 mg/l[2]. It is suspected that dichloromethane in the North Sea might reach concentrations up to 1 µg/l in heavily polluted coastal areas, although concentrations in polluted estuaries typically range around 0,1 µg/l[2].


Environmental standards and legislation

Included in the water framework list of priority substances


See Also

Methylenechloride on the ED North Database

Dichloromethane on the Ecotox Database


References

  1. 1,0 1,1 U.S. DEPARTMENT OF HEALTH AND HUMAN SERVICES 2000 TOXICOLOGICAL PROFILE FOR METHYLENE CHLORIDE
  2. 2,0 2,1 Euro Chlor February 1999 Euro Chlor Risk Assessment for the Marine Environment OSPARCOM Region - North Sea Dichloromethane