Chemical Fact Sheet

Chemical Abstract Number (CAS #) 205992
CASRN 205-99-2
Analytical Methods EPA Method 610
EPA Method 625
EPA Method 8100
EPA Method 8270
EPA Method 8310
Molecular FormulaC20H12

Link to the National Library of Medicine's Hazardous Substances
Database for more details on this compound.

Melting Point 168 DEG C
Molecular Weight 252.32
Environmental Impact Release of benzo(b)fluoranthene is most likely to result from the incomplete combustion of a variety of fuels including wood and fossil fuels. Plants may produce benzo(b)fluoranthene. When released to water, adsorption to suspended sediments is expected to remove most of the benzo(b)fluoranthene from solution. Photolysis and photo-oxidation of the benzo(b)fluoranthene which remains in solution is expected to occur but adsorbed benzo(b)fluoranthene is expected to resist these processes. Volatilization and biodegradation of dissolved benzo(b)fluoranthene may also occur. Bioconcentration in fish may occur; however microsomal oxidase, an enzyme capable of rapidly metabolizing polynuclear aromatic hydrocarbons, is present. Release to the soil may result in some biodegradation. Due to the anticipated strong adsorption of benzo(b)fluoranthene to the soil, volatilization, photolysis and leaching to groundwater are not expected to be significant. Benzo(b)fluoranthene in the atmosphere is likely to be adsorbed to particulate matter, and will be subject to wet and dry deposition. Benzo(b)fluoranthene in the vapor phase will react with photochemically generated, atmospheric hydroxyl radicals with an estimated half-life of 1.00 day. Photolysis of vapor phase benzo(b)fluoranthene will be rapid, but the adsorbed compound may not photolyze significantly. Benzo(b)fluoranthene is a contaminant in air, water, sediment, soil, fish, and other aquatic organisms and food. Human exposure results primarily from air.
Environmental Fate TERRESTRIAL FATE: Oily sludge was repeatedly applied to soil in lab. After 1280 days, 79.4% of the added benzo(b)fluoranthene (BbF) remained. An unspecified portion of this degradation was attributed to biodegradation . Very strong adsorption of BbF to soil is expected. Leaching to groundwater and volatilization are, therefore, expected to be slow, relatively insignificant processes. AQUATIC FATE: Volatilization, photolysis and photooxidation of dissolved benzo(b)fluoranthene (BbF) may occur, but most benzo(b)fluoranthene is expected to be adsorbed to sediments, so these other fate processes are not expected to be significant. Bioconcentration of benzo(b)fluoranthene may be significant, although fish can rapidly metabolize polynuclear aromatic hydrocarbons by the action of microsomal oxidase . ATMOSPHERIC FATE: An atmospheric half-life of 1.00 day was estimated for the reaction of vapor phase benzo(b)fluoranthene (BbF) with photochemically generated hydroxyl radicals(1,SRC). Adsorbed BbF will not react with hydroxyl radicals at this rate. Vapor phase benzo(b)fluoranthene is expected to directly photolyze at a rapid rate in the atmosphere, but the adsorbed compound may not do so.
Drinking Water Impact SURFACE WATER: Bellevue, WA - 1% samples pos, 2 ug/l . Benzo(b,k)fluoranthene isomers were 190-1008 ng/g in suspended sediments from the Niagara River at Niagara-on-the-Lake . Great Britain - 3.76-339.12 ng/l in four rivers used or intended for use as public water supply and 16.17-76.8 ng/l in water from rivers not intended for public water supply . Great Britain - <3-5 ng/l . Great Britain raw water (flowing into water treatment plants) - 5-139 ng/l . Great Britian - Tamar Estuary, water, 9.3 ng/l, suspended sediments, 871 ng/g . Benzo(b)fluoranthene was detected but not quantified in water samples taken in Ontario and in water samples taken in water surrounded by industry in Japan(6). BbF was 6600 ng/l in samples of surface water contaminated with road runoff . DRINKING WATER: Netherlands - 0.003 ug/l avg, 0.045 ug/l maximum . Great Britain - < 0.5-1 ng/l . Benzo(b)fluoranthene was detected but not quantified in drinking water from an unspecified source . GROUNDWATER: Netherlands - 3 ug/l maximum . Benzo(b)fluoranthene (BbF) was detected but not quantified in samples of groundwater contaminated with coal-tar wastes . Benzo(b)fluoranthene was < 1-4 ng/l in water from various groundwater distribution systems . RAIN/SNOW: Rain water - 4.4-14.6 ng/l . Benzo(b)fluoranthene was detected but not quantified in liquid and particulates from precipitation in Norway . EFFL: Sewage effluent in Japan contained 26.0 ng/l benzo(b)fluoranthene . Sewage effluents (United Kingdom) - 9.9-40.85 ng/l . Combined residues of benzo(b,j,k)fluoranthene isomers were found in sediments from the effluent channel from a coking plant in an unspecified location at 23 ug/g dry weight . Benzo(b)fluoranthene in treated wastewater effluents from a variety of industries were as follows . Coil coating - 30 samples, 3.33% pos, 10 ug/l maximum; foundries - 1 sample, 100% pos, 6 ug/l maximum; nonferrous metals manufacturing 42 samples, 2.4% pos, ND-12 ug/l, 0.5 ug/l avg; timber products processing 9 samples, 33.3% pos, 10-2500 ug/l, 10 ug/l avg . Domestic effluent: 0.036-0.202 ppb; Sewage (high percentage industry): 0.525-0.87 ppb; Sewage during dry weather: 0.039 ppb.

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