Photolytic and partitioning behavior of polynuclear aromatic compounds, aromatic amines, and phenols in aqueous coal oil
Aqueous fractions produced by equilibrating coal oil with water are toxic to several aquatic organisms. The oil/water distribution coefficients (K/sub D/s) and photolytic behavior of components of these fractions were studied to assess their transport and persistence in aquatic systems. Comparing K/sub D/s measured for homologs showed that the addition of a ring carbon or alkyl group increased logK/sub D/ by 0.31 and 0.45, respectively. Aqueous concentrations of the highly insoluble four- and five-ring polynuclear aromatic hydrocarbons (PAH) based on projected K/sub D/s were in the low nanograms-per-liter range. Photolysis rate constants measured in pure water for pyrene (0.82 h/sup -1/), benz(a)anthacene (1.0 h/sup -1/), and benzo(a)pyrene (1.4 h/sup -1/) were reduced sixfold to ninefold in the aqueous coal-oil matrix. Most of the main components of the acid, base, and aromatic hydrocarbon fractions of the aqueous coal-oil solutions were not photodegraded detectably in a three-hour exposure to sunlight. Indoles and carbazoles photodegraded rapidly, with half-lives of 2 to 19 h. Indoles apparently underwent sensitized photolysis in the aqueous coal-oil matrix. Indoles individually exposed to sunlight in water exhibited autocatalytic behavior, resulting in high quantum yields. Carbazole, with a 2.2-fold reduction in its photolysis rate constant, behaved similarly to the PAH.
- Research Organization:
- Argonne National Lab., IL (USA)
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 5211694
- Report Number(s):
- DOE/MC/49533-1837; ANL/SER-4; ON: DE85013710
- Country of Publication:
- United States
- Language:
- English
Similar Records
Sunlight photolysis rates of selected netural azaarenes in aqueous coal-oil systems
Photolysis rates of selected polynuclear aromatic hydrocarbons in aqueous coal-oil systems. [Fluoranthene, benzo(a)anthracene]
Related Subjects
54 ENVIRONMENTAL SCIENCES
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
COAL TAR OILS
CHEMICAL COMPOSITION
POLYCYCLIC AROMATIC HYDROCARBONS
ENVIRONMENTAL TRANSPORT
MUTAGENESIS
TOXICITY
AMINES
AQUATIC ECOSYSTEMS
AROMATICS
BENZANTHRACENE
BENZOPYRENE
BIODEGRADATION
BIOLOGICAL ACCUMULATION
CHEMICAL ANALYSIS
EXPERIMENTAL DATA
FISHES
FRACTIONATION
MUTAGEN SCREENING
PHENOLS
PHOTOLYSIS
PYRENE
ANIMALS
AQUATIC ORGANISMS
CHEMICAL REACTIONS
CONDENSED AROMATICS
DATA
DECOMPOSITION
ECOSYSTEMS
HYDROCARBONS
HYDROXY COMPOUNDS
INFORMATION
MASS TRANSFER
NUMERICAL DATA
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
PHOTOCHEMICAL REACTIONS
SCREENING
SEPARATION PROCESSES
VERTEBRATES
010600* - Coal
Lignite
& Peat- Properties & Composition
520200 - Environment
Aquatic- Chemicals Monitoring & Transport- (-1989)
560305 - Chemicals Metabolism & Toxicology- Vertebrates- (-1987)