Benzene Type: O
CAS No. 71432  
Physical Properties Value Reference
Molecular Weight (g/mol) 78.11364 TR
Solubility @ 20-25 degC (mg/L) 1770 TR
Vapor pressure @ 20-25 degC (mmHG) 95 TR
Henry's Law constant @ 20 degC 0.2273879 TR
Sorption coefficient (log L/kg) Koc 1.82 TR
Octanol-water partition coefficient (log L/kg) 1.993 TR
Diffusion coefficient in air (cm^2/s) 0.088 TR
Diffusion coefficient in water (cm^2/s) 9.8e-006 TR
Miscellaneous Parameters Value Reference
Relative bioavailability factor (-) 1 T
Analytical Detection Limits:
Water (mg/L) 0.002 S
Soil (mg/kg) 0.005 S
First-order decay half lives (days):
Saturated zone 720  
Unsaturated zone 720 H
Soil-to-plant biotransfer factor (0):
Above ground veg. -  
Below ground veg. - -
Toxicity Data Value Reference
EPA weight of evidence A  
Carcinogen TRUE  
Oral slope factor (1/[mg/kg/day]) 0.055 TR
Inhalation unit risk factor (1/[ug/m^3]) 7.8e-006 TR
Oral reference dose (mg/kg/day) 0.003 TR
Inhalation reference conc. (mg/m^3) 0.006 TR
Dermal Exposure Value Reference
Dermal adsorption fraction (-) 0 TR
Gastrointestinal adsorption fraction (-) 0.97 TR
Dermal permeability coefficient (cm/hr) 0.021 D
Lag time for dermal exposure (hr) 0.26 D
Critical dermal exposure time (hr) 0.63  
Relative contribution of perm. coeff. (-) 0.013  
Regulatory Standards Value Reference
Primary MCL 0.005 MC
Secondary MCL - -
Drinking Water MCLs (mg/L):
Occupational Air PEL/TWA (mg/m^3) 3.19 OS
Surface water quality criteria (mg/L)
Aquatic life protection: Fresh water biota - -
Aquatic life protection: Marine biota - -
Human health: Drinking / freshwater fish 0.005 T3
Human health: Fresh water fishing only 0.106 T3
Human health: Salt water fishing only 0.0708 T3
LAST UPDATE: Friday, 05 August 2011