Degradation pathways of PCB upon gamma irradiation
- Institut Armand-Frappier, Laval, Quebec (Canada)
- Institut National de la Recherche Scientifique, Pointe-Claire, Quebec (Canada)
In order to understand the modifications of the chromatographic profile of Aroclor 1260 upon gamma irradiation, a total of 14 pure polychlorinated biphenyl (PCB) congeners were separately irradiated in solution. Dechlorination was observed, and the generated products were investigated by gas chromatography and mass spectrometry. Degradation proceeds more rapidly in methanol/water mixture than in petroleum ether, but the relative amount of ortho-dechlorinated congeners formed upon irradiation was smaller in the former solvent Ortho chlorines are preferentially lost in petroleum ether except when they are involved in a 2,5 (or 3,6) substitution pattern, in which case para dechlorination becomes predominant. The precursors of some toxicologically important congeners such as congeners 77, 118, 167, and 189 have been identified. These data are useful to rationalize the modifications of the chromatographic profile of PCB complex mixture upon gamma irradiation.
- OSTI ID:
- 5881652
- Journal Information:
- Environmental Health Perspectives; (USA), Journal Name: Environmental Health Perspectives; (USA) Vol. 89; ISSN 0091-6765; ISSN EVHPA
- Country of Publication:
- United States
- Language:
- English
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400600* -- Radiation Chemistry
AROMATICS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
CHLORINATED AROMATIC HYDROCARBONS
COBALT 60
COBALT ISOTOPES
DECOMPOSITION
ELECTROMAGNETIC RADIATION
ETHERS
GAMMA RADIATION
HALOGENATED AROMATIC HYDROCARBONS
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
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ISOTOPES
MINUTES LIVING RADIOISOTOPES
NUCLEI
ODD-ODD NUCLEI
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
ORGANIC SOLVENTS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
RADIOISOTOPES
RADIOLYSIS
SOLVENTS
TOXICITY
YEARS LIVING RADIOISOT