CAS Number: 8006-14-2
SMILES : C
CHEM   : Natural gas
MOL FOR: C1 H4 
MOL WT : 16.04
------------------------------ EPI SUMMARY (v4.10) --------------------------
 Physical Property Inputs:
    Log Kow (octanol-water):   ------
    Boiling Point (deg C)  :   ------
    Melting Point (deg C)  :   ------
    Vapor Pressure (mm Hg) :   ------
    Water Solubility (mg/L):   ------
    Henry LC (atm-m3/mole) :   ------
 
 Log Octanol-Water Partition Coef (SRC):
    Log Kow (KOWWIN v1.68 estimate) =  0.78
    Log Kow (Exper. database match) =  1.09
       Exper. Ref:  HANSCH,C ET AL. (1995)
 
Boiling Pt, Melting Pt, Vapor Pressure Estimations (MPBPVP v1.43):
    Boiling Pt (deg C):  -62.40  (Adapted Stein & Brown method)
    Melting Pt (deg C):  -152.93  (Mean or Weighted MP)
    VP(mm Hg,25 deg C):  5.31E+005  (Mean VP of Antoine & Grain methods)
    VP (Pa, 25 deg C) :  7.07E+007  (Mean VP of Antoine & Grain methods)
    MP  (exp database):  -182.4 deg C
    BP  (exp database):  -161.5 deg C
    VP  (exp database):  4.66E+05 mm Hg (6.21E+007 Pa) at 25 deg C
 
 Water Solubility Estimate from Log Kow (WSKOW v1.42):
    Water Solubility at 25 deg C (mg/L):  2610
       log Kow used: 1.09 (expkow database)
       no-melting pt equation used
     Water Sol (Exper. database match) =  22 mg/L (25 deg C)
        Exper. Ref:  YALKOWSKY,SH & DANNENFELSER,RM (1992)
 
 Water Sol Estimate from Fragments:
    Wat Sol (v1.01 est) =  428.49 mg/L
 
 ECOSAR Class Program (ECOSAR v1.00):
    Class(es) found:
       Neutral Organics
 
 Henrys Law Constant (25 deg C) [HENRYWIN v3.20]:
   Bond Method :   4.14E-001  atm-m3/mole  (4.20E+004 Pa-m3/mole)
   Group Method:   6.58E-001  atm-m3/mole  (6.67E+004 Pa-m3/mole)
   Exper Database: 6.58E-01  atm-m3/mole  (6.67E+004 Pa-m3/mole)
 For Henry LC Comparison Purposes:
   User-Entered Henry LC:  not entered
   Henrys LC [via VP/WSol estimate using User-Entered or Estimated values]:
      HLC:  6.146E-003 atm-m3/mole  (6.227E+002 Pa-m3/mole)
      VP:   5.31E+005 mm Hg (source: MPBPVP)
      WS:   2.61E+003 mg/L (source: WSKOWWIN)
 
 Log Octanol-Air Partition Coefficient (25 deg C) [KOAWIN v1.10]:
  Log Kow used:  1.09  (exp database)
  Log Kaw used:  1.430  (exp database)
      Log Koa (KOAWIN v1.10 estimate):  -0.340
      Log Koa (experimental database):  -0.380
 
 Probability of Rapid Biodegradation (BIOWIN v4.10):
   Biowin1 (Linear Model)         :   0.7399
   Biowin2 (Non-Linear Model)     :   0.9416
 Expert Survey Biodegradation Results:
   Biowin3 (Ultimate Survey Model):   3.1637  (weeks       )
   Biowin4 (Primary Survey Model) :   3.8246  (days        )
 MITI Biodegradation Probability:
   Biowin5 (MITI Linear Model)    :   0.6648
   Biowin6 (MITI Non-Linear Model):   0.8891
 Anaerobic Biodegradation Probability:
   Biowin7 (Anaerobic Linear Model):  0.7565
 Ready Biodegradability Prediction:   YES
 
 Hydrocarbon Biodegradation (BioHCwin v1.01):
     LOG BioHC Half-Life (days) :   0.5033
     BioHC Half-Life (days)     :   3.1866
 
 Sorption to aerosols (25 Dec C)[AEROWIN v1.00]:
  Vapor pressure (liquid/subcooled):  6.21E+007 Pa (4.66E+005 mm Hg)
  Log Koa (Exp database): -0.380
   Kp (particle/gas partition coef. (m3/ug)):
       Mackay model           :  4.83E-014 
       Octanol/air (Koa) model:  1.02E-013 
   Fraction sorbed to airborne particulates (phi):
       Junge-Pankow model     :  1.74E-012 
       Mackay model           :  3.86E-012 
       Octanol/air (Koa) model:  8.19E-012 
 
 Atmospheric Oxidation (25 deg C) [AopWin v1.92]:
   Hydroxyl Radicals Reaction:
      OVERALL OH Rate Constant =   0.0069 E-12 cm3/molecule-sec
      Half-Life =  1559.182 Days (12-hr day; 1.5E6 OH/cm3)
   Ozone Reaction:
      No Ozone Reaction Estimation
   Fraction sorbed to airborne particulates (phi):
      2.8E-012 (Junge-Pankow, Mackay avg)
      8.19E-012 (Koa method)
    Note: the sorbed fraction may be resistant to atmospheric oxidation
 
 Soil Adsorption Coefficient (KOCWIN v2.00):
      Koc    :  3.979  L/kg (MCI method)
      Log Koc:  0.600       (MCI method)
      Koc    :  8.823  L/kg (Kow method)
      Log Koc:  0.946       (Kow method)
 
 Aqueous Base/Acid-Catalyzed Hydrolysis (25 deg C) [HYDROWIN v2.00]:
    Rate constants can NOT be estimated for this structure!
 
 Bioaccumulation Estimates (BCFBAF v3.01):
   Log BCF from regression-based method = 0.386 (BCF = 2.433 L/kg wet-wt)
   Log Biotransformation Half-life (HL) = -0.9981 days (HL = 0.1004 days)
   Log BCF Arnot-Gobas method (upper trophic) = 0.284 (BCF = 1.922)
   Log BAF Arnot-Gobas method (upper trophic) = 0.284 (BAF = 1.922)
       log Kow used: 1.09 (expkow database)
 
 Volatilization from Water:
    Henry LC:  0.658 atm-m3/mole  (Henry experimental database)
    Half-Life from Model River:      2.093  hours
    Half-Life from Model Lake :      2.093  hours
 
 Removal In Wastewater Treatment (recommended maximum 95%):
    Total removal:              99.61  percent
    Total biodegradation:        0.02  percent
    Total sludge adsorption:     0.28  percent
    Total to Air:               99.31  percent
      (using 10000 hr Bio P,A,S)
 
 Level III Fugacity Model:
           Mass Amount    Half-Life    Emissions
            (percent)        (hr)       (kg/hr)
   Air       56.8            3.74e+004    1000       
   Water     42.6            360          1000       
   Soil      0.5             720          1000       
   Sediment  0.0852          3.24e+003    0          
     Persistence Time: 144 hr