Benzo-a-pyrene Type: O
CAS No. 50328  
Physical Properties Value Reference
Molecular Weight (g/mol) 252.31528 TR
Solubility @ 20-25 degC (mg/L) 0.00162 TR
Vapor pressure @ 20-25 degC (mmHG) 4.89e-009 TR
Henry's Law constant @ 20 degC 4.69741e-005 TR
Sorption coefficient (log L/kg) Koc 5.98 TR
Octanol-water partition coefficient (log L/kg) 6.109 TR
Diffusion coefficient in air (cm^2/s) 0.043 TR
Diffusion coefficient in water (cm^2/s) 9e-006 TR
Miscellaneous Parameters Value Reference
Relative bioavailability factor (-) 1 T
Analytical Detection Limits:
Water (mg/L) 0.01 S2
Soil (mg/kg) 0.66 S2
First-order decay half lives (days):
Saturated zone 1060  
Unsaturated zone 1060 H
Soil-to-plant biotransfer factor (0):
Above ground veg. -  
Below ground veg. - -
Toxicity Data Value Reference
EPA weight of evidence B2  
Carcinogen TRUE  
Oral slope factor (1/[mg/kg/day]) 7.3 TR
Inhalation unit risk factor (1/[ug/m^3]) 0.00088 TR
Oral reference dose (mg/kg/day) - -
Inhalation reference conc. (mg/m^3) - -
Dermal Exposure Value Reference
Dermal adsorption fraction (-) 0.13 TR
Gastrointestinal adsorption fraction (-) 0.89 TR
Dermal permeability coefficient (cm/hr) - -
Lag time for dermal exposure (hr) - -
Critical dermal exposure time (hr) -  
Relative contribution of perm. coeff. (-) -  
Regulatory Standards Value Reference
Primary MCL 0.0002 MC
Secondary MCL - -
Drinking Water MCLs (mg/L):
Occupational Air PEL/TWA (mg/m^3) 0.2 PS
Surface water quality criteria (mg/L)
Aquatic life protection: Fresh water biota - -
Aquatic life protection: Marine biota - -
Human health: Drinking / freshwater fish 9.9e-005 T3
Human health: Fresh water fishing only 0.00081 T3
Human health: Salt water fishing only 0.00054 T3
LAST UPDATE: Friday, 05 August 2011