Deprecated ChemSpider Record

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ChemSpider 2D Image | (~8~C)Methane | 8CH4

(8C)Methane

  • Molecular Formula8CH4
  • Average mass12.032 Da
  • Monoisotopic mass12.031300 Da
  • ChemSpider ID9810691
  • Non-standard isotope - Non-standard isotope


More details:





Date of deprecation: 10:59, Apr 9, 2014
Reason for deprecation: Deprecate record: Carbon-8 has a half life of 2.0(4) × 10^-21 s... highly unlikely it would form methane in that time frame.

If you believe this record was deprecated in error, please use the Comment on this record button to contact the ChemSpider team.

Common reasons for deprecation are:
  • Chemically impossible structures (eg. incorrect valence atoms)
  • Lack of any linking data sources
  • Poor depiction of a structure that is already in ChemSpider

Predicted data is generated using the ACD/Labs Percepta Platform - PhysChem Module

No predicted properties have been calculated for this compound.

Predicted data is generated using the US Environmental Protection Agency’s EPISuite™

                        
 Log Octanol-Water Partition Coef (SRC):
    Log Kow (KOWWIN v1.67 estimate) =  0.78
    Log Kow (Exper. database match) =  1.09
       Exper. Ref:  Hansch,C et al. (1995)

 Boiling Pt, Melting Pt, Vapor Pressure Estimations (MPBPWIN v1.42):
    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)
    MP  (exp database):  -182.4 deg C
    BP  (exp database):  -161.5 deg C
    VP  (exp database):  4.66E+05 mm Hg at 25 deg C

 Water Solubility Estimate from Log Kow (WSKOW v1.41):
    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
    Wat Sol (Exper. database match) =  22.00
       Exper. Ref:  YALKOWSKY,SH & DANNENFELSER,RM (1992)

 ECOSAR Class Program (ECOSAR v0.99h):
    Class(es) found:
       Neutral Organics

 Henrys Law Constant (25 deg C) [HENRYWIN v3.10]:
   Bond Method :   4.14E-001  atm-m3/mole
   Group Method:   6.58E-001  atm-m3/mole
   Exper Database: 6.58E-01  atm-m3/mole
 Henrys LC [VP/WSol estimate using EPI values]:  6.146E-003 atm-m3/mole

 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,Mackay)
    Note: the sorbed fraction may be resistant to atmospheric oxidation

 Soil Adsorption Coefficient (PCKOCWIN v1.66):
      Koc    :  4.203
      Log Koc:  0.624 

 Aqueous Base/Acid-Catalyzed Hydrolysis (25 deg C) [HYDROWIN v1.67]:
    Rate constants can NOT be estimated for this structure!

 Bioaccumulation Estimates from Log Kow (BCFWIN v2.17):
   Log BCF from regression-based method = 0.139 (BCF = 1.378)
       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      0.502           720          1000       
   Sediment  0.0871          3.24e+003    0          
     Persistence Time: 144 hr




                    

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