Degradation pathways of PCBs upon UV irradiation in hexane.
Chemosphere
; 39(10): 1639-50, 1999 Oct.
Article
en En
| MEDLINE
| ID: mdl-10520484
ABSTRACT
The photodegradations of eight individual PCB congeners (5, 31, 52, 77, 87, 126, 138, 169) in hexane have been investigated employing a mercury lamp. All degradation reactions of the above mentioned PCB congeners are of the pseudo first order. The principal products of PCB decomposition are the less chlorinated biphenyls, and no PCB-solvent adducts are found. Symmetrical and coplanar PCB congeners show lower photoreactivities. The reactivities of the chlorine atoms at various positions of PCB rings are generally in the order ortho > meta > para. Photodechlorinations occur mainly on the more substituted rings, when the numbers of chlorine atoms on the two phenyl rings are unequal. During photodegradation, some coplanar PCB congeners are formed, which make the TEQ of solutions to decrease slowly or even to increase.
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Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Bifenilos Policlorados
/
Hexanos
Idioma:
En
Revista:
Chemosphere
Año:
1999
Tipo del documento:
Article
País de afiliación:
China