Products and quantum yields for photolysis of chloroaromatics in water

Journal Article · Tue Dec 31 23:00:00 EST 1985 · Environ. Sci. Technol.; (United States)

DOI:https://doi.org/10.1021/es00143a009· OSTI ID:6012893

Dulin, D; Drossman, H; Mill, T

Photolysis of chlorobenzene, 2- and 4-chlorobiphenyl, and 2- and 4-chlorobiphenyl ethers in water with 250-300-nm light produce corresponding phenols or, in the case of 2-chlorobiphenyl ether, dibenzofuran exclusively. Quantum yields in most cases are very similar to those reported in hexane for the reduction process. 1,2,4-Trichlorobenzene and 2,3,7,8-tetrachlorodibenzodioxin (TC-DD) photolyze much less efficiently in water than in hexane. A common pathway for photolysis of monochloroaromatics involving aryl cations accounts well for the experimental observations. C-O rather than C-Cl cleavage in TCDD may be a major pathway for its loss. Half-lives for photolysis of these chloroaromatics in sunlight in water range from 460 years to 5 days; TCDD photolyzes in water with a half-life of about 4-5 days in summer at 40/sup 0/ latitude. 40 references, 1 figure, 8 tables.

• Research Organization: SRI International, Menlo Park, CA
• OSTI ID: 6012893
• Journal Information: Environ. Sci. Technol.; (United States), Journal Name: Environ. Sci. Technol.; (United States) Vol. 20:1; ISSN ESTHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
AROMATICS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISTRY
CHLORINATED AROMATIC HYDROCARBONS
DECOMPOSITION
HALOGENATED AROMATIC HYDROCARBONS
HYDROXY COMPOUNDS
KINETICS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PHENOLS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
REACTION KINETICS
SYNTHESIS
WATER CHEMISTRY