Heptachlor Type: O
CAS No. 76448  
Physical Properties Value Reference
Molecular Weight (g/mol) 373.3207 TR
Solubility @ 20-25 degC (mg/L) 0.18 TR
Vapor pressure @ 20-25 degC (mmHG) 0.000326 TR
Henry's Law constant @ 20 degC 0.02440159 TR
Sorption coefficient (log L/kg) Koc 4.07 TR
Octanol-water partition coefficient (log L/kg) 6.2065 TR
Diffusion coefficient in air (cm^2/s) 0.0112 TR
Diffusion coefficient in water (cm^2/s) 5.69e-006 TR
Miscellaneous Parameters Value Reference
Relative bioavailability factor (-) 1 T
Analytical Detection Limits:
Water (mg/L) - -
Soil (mg/kg) - -
First-order decay half lives (days):
Saturated zone -  
Unsaturated zone - -
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]) 4.5 TR
Inhalation unit risk factor (1/[ug/m^3]) 0.0013 TR
Oral reference dose (mg/kg/day) 0.0005 TR
Inhalation reference conc. (mg/m^3) - -
Dermal Exposure Value Reference
Dermal adsorption fraction (-) 0.1 TR
Gastrointestinal adsorption fraction (-) 0.72 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 0.0004 MC
Secondary MCL - -
Drinking Water MCLs (mg/L):
Occupational Air PEL/TWA (mg/m^3) 0.5 OS
Surface water quality criteria (mg/L)
Aquatic life protection: Fresh water biota 3.8e-006 T1
Aquatic life protection: Marine biota 3.6e-006 T1
Human health: Drinking / freshwater fish 2.6e-006 T3
Human health: Fresh water fishing only 2.65e-006 T3
Human health: Salt water fishing only 1.77e-006 T3
LAST UPDATE: Sunday, 29 November -0001