| Title: |
Photodegradation of DDT in ice
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| Resource Type: |
document --> technical publication --> proceedings / conference paper(s)
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| Country: |
EU Projects
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| Year of publication: |
2003 |
| Availability: |
Dupalová, V. et al. (2003) Photodegradation of DDT in ice. Persistent Toxic Substances Contamination of the European Region
as a reflection of results of the GEF/UNEP Regional Based Assessment of Persistent Toxic Substances (RBA PTS) in Europe, the implementation of the Stockholm Convention and 'Community Strategy for Dioxins, Furans and PCBs
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| Author 1/Producer: |
Dupalová, V.
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| Other Authors/Producers: |
Klánová, J., Klán, P.
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| Author / Producer Type: |
EC Project
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| Format (e.g. PDF): |
PDF
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EUGRIS Keyword(s): |
Diffuse pollution-->Contaminants-->Persistent Organic Pollutants
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| Short description: |
Numerous studies on the photochemical transformation of DDT (1,1,1-trichloro-2,2-bis(4-chlorophenyl)ethane) in organic solvents have been reported.1-3 It is known that DDTis mainly converted by photolysis into DDE (1,1-dichloro-2,2-bis(4-chlorophenyl)ethylene), DDD (1,1-dichloro-2,2-bis(4-chlorophenyl)ethane and DDMU (2,2-bis(4-chlorophenyl)-1-chloroethylene) in organic solvents through reductive dechlorination mechanism. Phototransformation pathways strongly depend on the type of a medium used. Hong with co-workers4 have studied photodegradation of DDT in liquid water. A total of 17 photodegradation products, including DDD, DDE, DDMU, DCBP (4,4´-dichlorobenzophenone), DDCE (2,2-bis(4-chlorophenyl)-1-chloroethane), DCPM (bis(4-chlorophenyl)methane), were identified by gas chromatography-mass spectrometry. Water ice and snow certainly represent a unique environment for photochemical reactions.5 Ice present polycrystalline material containing reaction cavities, which are stationary and constant. Several laboroatory6,7 as well as field8 studies now provide evidence enough to suggest a model according to which persistent, and toxic compounds can be generated by photochemistry of primary pollutants in natural ice, and subsequently released to the environment.
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Submitted By:
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Dr Stefan Gödeke WhoDoesWhat?
Last update: 14/02/2006
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