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CAS Num: 035250-53-4
SMILES : n(ccnc1CCS)c1
CHEM : Pyrazineethanethiol
MOL FOR: C6 H8 N2 S1
MOL WT : 140.20
------------------------------ EPI SUMMARY (v4.00) --------------------------
Physical Property Inputs:
Water Solubility (mg/L): ------
Vapor Pressure (mm Hg) : ------
Henry LC (atm-m3/mole) : ------
Log Kow (octanol-water): ------
Boiling Point (deg C) : ------
Melting Point (deg C) : ------
Log Octanol-Water Partition Coef (SRC):
Log Kow (KOWWIN v1.67 estimate) = 0.92
Boiling Pt, Melting Pt, Vapor Pressure Estimations (MPBPWIN v1.43):
Boiling Pt (deg C): 237.00 (Adapted Stein & Brown method)
Melting Pt (deg C): 46.54 (Mean or Weighted MP)
VP(mm Hg,25 deg C): 0.0329 (Modified Grain method)
VP (Pa, 25 deg C) : 4.38 (Modified Grain method)
Subcooled liquid VP: 0.0517 mm Hg (25 deg C, Mod-Grain method)
: 6.89 Pa (25 deg C, Mod-Grain method)
Water Solubility Estimate from Log Kow (WSKOW v1.41):
Water Solubility at 25 deg C (mg/L): 1.363e+004
log Kow used: 0.92 (estimated)
no-melting pt equation used
Water Sol Estimate from Fragments:
Wat Sol (v1.01 est) = 20547 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 : 1.52E-007 atm-m3/mole (1.54E-002 Pa-m3/mole)
Group Method: 9.96E-011 atm-m3/mole (1.01E-005 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: 4.453E-007 atm-m3/mole (4.512E-002 Pa-m3/mole)
VP: 0.0329 mm Hg (source: MPBPVP)
WS: 1.36E+004 mg/L (source: WSKOWWIN)
Log Octanol-Air Partition Coefficient (25 deg C) [KOAWIN v1.10]:
Log Kow used: 0.92 (KowWin est)
Log Kaw used: -5.207 (HenryWin est)
Log Koa (KOAWIN v1.10 estimate): 6.127
Log Koa (experimental database): None
Probability of Rapid Biodegradation (BIOWIN v4.10):
Biowin1 (Linear Model) : 0.7355
Biowin2 (Non-Linear Model) : 0.8313
Expert Survey Biodegradation Results:
Biowin3 (Ultimate Survey Model): 2.8145 (weeks )
Biowin4 (Primary Survey Model) : 3.5769 (days-weeks )
MITI Biodegradation Probability:
Biowin5 (MITI Linear Model) : 0.3134
Biowin6 (MITI Non-Linear Model): 0.2981
Anaerobic Biodegradation Probability:
Biowin7 (Anaerobic Linear Model): 0.4540
Ready Biodegradability Prediction: NO
Hydrocarbon Biodegradation (BioHCwin v1.01):
Structure incompatible with current estimation method!
Sorption to aerosols (25 Dec C)[AEROWIN v1.00]:
Vapor pressure (liquid/subcooled): 6.89 Pa (0.0517 mm Hg)
Log Koa (Koawin est ): 6.127
Kp (particle/gas partition coef. (m3/ug)):
Mackay model : 4.35E-007
Octanol/air (Koa) model: 3.29E-007
Fraction sorbed to airborne particulates (phi):
Junge-Pankow model : 1.57E-005
Mackay model : 3.48E-005
Octanol/air (Koa) model: 2.63E-005
Atmospheric Oxidation (25 deg C) [AopWin v1.92]:
Hydroxyl Radicals Reaction:
OVERALL OH Rate Constant = 43.1811 E-12 cm3/molecule-sec
Half-Life = 0.248 Days (12-hr day; 1.5E6 OH/cm3)
Half-Life = 2.972 Hrs
Ozone Reaction:
No Ozone Reaction Estimation
Fraction sorbed to airborne particulates (phi):
2.53E-005 (Junge-Pankow, Mackay avg)
2.63E-005 (Koa method)
Note: the sorbed fraction may be resistant to atmospheric oxidation
Soil Adsorption Coefficient (KOCWIN v2.00):
Koc : 205.9 L/kg (MCI method)
Log Koc: 2.314 (MCI method)
Koc : 67.98 L/kg (Kow method)
Log Koc: 1.832 (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) = -0.9483 days (HL = 0.1127 days)
Log BCF Arnot-Gobas method (upper trophic) = 0.208 (BCF = 1.614)
Log BAF Arnot-Gobas method (upper trophic) = 0.208 (BAF = 1.614)
log Kow used: 0.92 (estimated)
Volatilization from Water:
Henry LC: 1.52E-007 atm-m3/mole (estimated by Bond SAR Method)
Half-Life from Model River: 4562 hours (190.1 days)
Half-Life from Model Lake : 4.987E+004 hours (2078 days)
Removal In Wastewater Treatment:
Total removal: 1.89 percent
Total biodegradation: 0.09 percent
Total sludge adsorption: 1.79 percent
Total to Air: 0.01 percent
(using 10000 hr Bio P,A,S)
Level III Fugacity Model:
Mass Amount Half-Life Emissions
(percent) (hr) (kg/hr)
Air 0.477 5.94 1000
Water 24.9 360 1000
Soil 74.4 720 1000
Sediment 0.242 3.24e+003 0
Persistence Time: 488 hr