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