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CAS Number: 6725-64-0
SMILES : C(S)S
CHEM : methanedithiol
MOL FOR: C1 H4 S2
MOL WT : 80.16
------------------------------ EPI SUMMARY (v4.00) --------------------------
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 v1.67 estimate) = 0.72
Boiling Pt, Melting Pt, Vapor Pressure Estimations (MPBPVP v1.43):
Boiling Pt (deg C): 118.30 (Adapted Stein & Brown method)
Melting Pt (deg C): -71.90 (Mean or Weighted MP)
VP(mm Hg,25 deg C): 16.9 (Mean VP of Antoine & Grain methods)
VP (Pa, 25 deg C) : 2.25E+003 (Mean VP of Antoine & Grain methods)
Water Solubility Estimate from Log Kow (WSKOW v1.41):
Water Solubility at 25 deg C (mg/L): 3.174e+004
log Kow used: 0.72 (estimated)
no-melting pt equation used
Water Sol Estimate from Fragments:
Wat Sol (v1.01 est) = 6946.9 mg/L
ECOSAR Class Program (ECOSAR v1.00):
Class(es) found:
Thiols and Mercaptans
Henrys Law Constant (25 deg C) [HENRYWIN v3.20]:
Bond Method : 9.27E-005 atm-m3/mole (9.40E+000 Pa-m3/mole)
Group Method: Incomplete
For Henry LC Comparison Purposes:
User-Entered Henry LC: not entered
Henrys LC [via VP/WSol estimate using User-Entered or Estimated values]:
HLC: 5.616E-005 atm-m3/mole (5.690E+000 Pa-m3/mole)
VP: 16.9 mm Hg (source: MPBPVP)
WS: 3.17E+004 mg/L (source: WSKOWWIN)
Log Octanol-Air Partition Coefficient (25 deg C) [KOAWIN v1.10]:
Log Kow used: 0.72 (KowWin est)
Log Kaw used: -2.421 (HenryWin est)
Log Koa (KOAWIN v1.10 estimate): 3.141
Log Koa (experimental database): None
Probability of Rapid Biodegradation (BIOWIN v4.10):
Biowin1 (Linear Model) : 0.7094
Biowin2 (Non-Linear Model) : 0.8665
Expert Survey Biodegradation Results:
Biowin3 (Ultimate Survey Model): 3.0220 (weeks )
Biowin4 (Primary Survey Model) : 3.7321 (days-weeks )
MITI Biodegradation Probability:
Biowin5 (MITI Linear Model) : 0.5231
Biowin6 (MITI Non-Linear Model): 0.6550
Anaerobic Biodegradation Probability:
Biowin7 (Anaerobic Linear Model): 0.8621
Ready Biodegradability Prediction: YES
Hydrocarbon Biodegradation (BioHCwin v1.01):
Structure incompatible with current estimation method!
Sorption to aerosols (25 Dec C)[AEROWIN v1.00]:
Vapor pressure (liquid/subcooled): 2.11E+003 Pa (15.8 mm Hg)
Log Koa (Koawin est ): 3.141
Kp (particle/gas partition coef. (m3/ug)):
Mackay model : 1.42E-009
Octanol/air (Koa) model: 3.4E-010
Fraction sorbed to airborne particulates (phi):
Junge-Pankow model : 5.14E-008
Mackay model : 1.14E-007
Octanol/air (Koa) model: 2.72E-008
Atmospheric Oxidation (25 deg C) [AopWin v1.92]:
Hydroxyl Radicals Reaction:
OVERALL OH Rate Constant = 121.8246 E-12 cm3/molecule-sec
Half-Life = 0.088 Days (12-hr day; 1.5E6 OH/cm3)
Half-Life = 1.054 Hrs
Ozone Reaction:
No Ozone Reaction Estimation
Fraction sorbed to airborne particulates (phi):
8.27E-008 (Junge-Pankow, Mackay avg)
2.72E-008 (Koa method)
Note: the sorbed fraction may be resistant to atmospheric oxidation
Soil Adsorption Coefficient (KOCWIN v2.00):
Koc : 21.73 L/kg (MCI method)
Log Koc: 1.337 (MCI method)
Koc : 4.212 L/kg (Kow method)
Log Koc: 0.624 (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 v3.00):
Log BCF from regression-based method = 0.500 (BCF = 3.162 L/kg wet-wt)
Log Biotransformation Half-life (HL) = -1.4972 days (HL = 0.03183 days)
Log BCF Arnot-Gobas method (upper trophic) = 0.079 (BCF = 1.2)
Log BAF Arnot-Gobas method (upper trophic) = 0.079 (BAF = 1.2)
log Kow used: 0.72 (estimated)
Volatilization from Water:
Henry LC: 9.27E-005 atm-m3/mole (estimated by Bond SAR Method)
Half-Life from Model River: 6.568 hours
Half-Life from Model Lake : 146.7 hours (6.114 days)
Removal In Wastewater Treatment:
Total removal: 6.37 percent
Total biodegradation: 0.09 percent
Total sludge adsorption: 1.70 percent
Total to Air: 4.57 percent
(using 10000 hr Bio P,A,S)
Level III Fugacity Model:
Mass Amount Half-Life Emissions
(percent) (hr) (kg/hr)
Air 0.502 2.11 1000
Water 36.5 360 1000
Soil 62.9 720 1000
Sediment 0.0999 3.24e+003 0
Persistence Time: 297 hr