Title: Photodegradation of DDT in ice 
Resource Type: document --> technical publication --> proceedings / conference paper(s) 
Country: EU Projects 
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 
Author 1/Producer: Dupalová, V. 
Other Authors/Producers: Klánová, J., Klán, P. 
Author / Producer Type: EC Project 
Report / download web link (=direct link): http://www.recetox.muni.cz/coe/sources/workshop_1_rba_pts/VI ...  
Format (e.g. PDF): PDF 
EUGRIS Keyword(s): Diffuse pollution-->Contaminants-->Persistent Organic Pollutants
 
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. 
Link to Project(s): RECETOX Centre of Excellence in Environmental Chemistry and Ecotoxicology
 
Submitted By: Dr Stefan Gödeke WhoDoesWhat?      Last update: 14/02/2006