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-31109-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
010600* -- Coal
Lignite
& Peat-- Properties & Composition
520200 -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
560305 -- Chemicals Metabolism & Toxicology-- Vertebrates-- (-1987)
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
AMINES
ANIMALS
AQUATIC ECOSYSTEMS
AQUATIC ORGANISMS
AROMATICS
BENZANTHRACENE
BENZOPYRENE
BIODEGRADATION
BIOLOGICAL ACCUMULATION
CHEMICAL ANALYSIS
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
COAL TAR OILS
CONDENSED AROMATICS
DATA
DECOMPOSITION
ECOSYSTEMS
ENVIRONMENTAL TRANSPORT
EXPERIMENTAL DATA
FISHES
FRACTIONATION
HYDROCARBONS
HYDROXY COMPOUNDS
INFORMATION
MASS TRANSFER
MUTAGEN SCREENING
MUTAGENESIS
NUMERICAL DATA
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
PHENOLS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
POLYCYCLIC AROMATIC HYDROCARBONS
PYRENE
SCREENING
SEPARATION PROCESSES
TOXICITY
VERTEBRATES