Organic photochemistry: simulated atmospheric photodecomposition rates of methylene chloride, 1,1,1-trichloroethane, trichloroethylene, tetrachloroethylene, and other compounds
To estimate the decomposition rates of chloro compounds in the atmosphere, we carried out laboratory studies on the photolysis rates of the four title compounds, six other chlorohydrocarbons, and 23 other organic compounds under simulated atmospheric conditions. In the presence of nitric oxide, vinylidene chloride, cis- and trans-dichloroethylene, trichloroethylene, and vinyl chloride decomposed at moderate rates (estimated half-lives of 5 to 12 h under bright sunlight) when compared with a series of standard hydrocarbons. Chlorobenzene, tetrachloroethylene, and 1,1,2-trichloroethane decomposed slowly (estimated half-lives 20 to 40 h). Methylene chloride and 1,1,1-trichloroethane did not decompose (half-lives >250 and much greater than 1700 h respectively). The photodecomposition rates of several chloro compounds were determined in mixtures with other organic compounds and also in the presence of nitrogen dioxide, ozone, chloral, acetaldehyde, chlorine, and phosgene. The presence of hydrocarbons reduced the decomposition rates of several chloroethylenes.
- Research Organization:
- Dow Chemical Co., Midland, MI
- OSTI ID:
- 7122528
- Journal Information:
- Environ. Sci. Technol.; (United States), Vol. 10:4
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CHLORINATED ALIPHATIC HYDROCARBONS
PHOTOCHEMISTRY
CHLORINATED AROMATIC HYDROCARBONS
ORGANIC COMPOUNDS
DECOMPOSITION
AIR POLLUTION
CHLORINE COMPOUNDS
HYDROCARBONS
NITROGEN COMPOUNDS
OZONE
AROMATICS
CHEMICAL REACTIONS
CHEMISTRY
HALOGEN COMPOUNDS
HALOGENATED ALIPHATIC HYDROCARBONS
HALOGENATED AROMATIC HYDROCARBONS
ORGANIC CHLORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
POLLUTION
500200* - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)