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Methyl t-Butyl ether (MTBE) Type: O
CAS No. 1634044  
Physical Properties Value Reference
Molecular Weight (g/mol) 88.14968 TR
Solubility @ 20-25 degC (mg/L) 48000 TR
Vapor pressure @ 20-25 degC (mmHG) 249 TR
Henry's Law constant @ 20 degC 0.02440159 TR
Sorption coefficient (log L/kg) Koc 1.15 TR
Octanol-water partition coefficient (log L/kg) 1.4292 TR
Diffusion coefficient in air (cm^2/s) 0.0792 TR
Diffusion coefficient in water (cm^2/s) 9.41e-005 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 360  
Unsaturated zone 180 H
Soil-to-plant biotransfer factor (0):
Above ground veg. -  
Below ground veg. - -
     
Toxicity Data Value Reference
EPA weight of evidence NA  
Carcinogen TRUE  
Oral slope factor (1/[mg/kg/day]) 0.0018 TR
Inhalation unit risk factor (1/[ug/m^3]) 2.6e-007 TR
Oral reference dose (mg/kg/day) 0.01 TR
Inhalation reference conc. (mg/m^3) 3 TR
     
Dermal Exposure Value Reference
Dermal adsorption fraction (-) 0 TR
Gastrointestinal adsorption fraction (-) 0.8 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 - -
Secondary MCL - -
Drinking Water MCLs (mg/L):
Occupational Air PEL/TWA (mg/m^3) 144 AC
Surface water quality criteria (mg/L)
Aquatic life protection: Fresh water biota - -
Aquatic life protection: Marine biota - -
Human health: Drinking / freshwater fish - -
Human health: Fresh water fishing only - -
Human health: Salt water fishing only - -
     
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