This page contains the EPI System Summary only.
For complete control of this information -
Download the free EPI SuiteTM v4.0 program : here
also you can go back to the Datasheet
CAS Num: 013925-07-0
SMILES : n(c(c(nc1C)C)CC)c1
CHEM : Pyrazine, 2-ethyl-3,5-dimethyl-
MOL FOR: C8 H12 N2
MOL WT : 136.20
------------------------------ 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) = 2.07
Boiling Pt, Melting Pt, Vapor Pressure Estimations (MPBPWIN v1.43):
Boiling Pt (deg C): 209.40 (Adapted Stein & Brown method)
Melting Pt (deg C): 31.78 (Mean or Weighted MP)
VP(mm Hg,25 deg C): 0.18 (Modified Grain method)
VP (Pa, 25 deg C) : 24 (Modified Grain method)
Subcooled liquid VP: 0.207 mm Hg (25 deg C, Mod-Grain method)
: 27.6 Pa (25 deg C, Mod-Grain method)
Water Solubility Estimate from Log Kow (WSKOW v1.41):
Water Solubility at 25 deg C (mg/L): 1473
log Kow used: 2.07 (estimated)
no-melting pt equation used
Water Sol Estimate from Fragments:
Wat Sol (v1.01 est) = 7118.2 mg/L
ECOSAR Class Program (ECOSAR v1.00):
Class(es) found:
Neutral Organics
Henrys Law Constant (25 deg C) [HENRYWIN v3.20]:
Bond Method : 5.21E-006 atm-m3/mole (5.28E-001 Pa-m3/mole)
Group Method: 2.74E-008 atm-m3/mole (2.78E-003 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: 2.190E-005 atm-m3/mole (2.219E+000 Pa-m3/mole)
VP: 0.18 mm Hg (source: MPBPVP)
WS: 1.47E+003 mg/L (source: WSKOWWIN)
Log Octanol-Air Partition Coefficient (25 deg C) [KOAWIN v1.10]:
Log Kow used: 2.07 (KowWin est)
Log Kaw used: -3.672 (HenryWin est)
Log Koa (KOAWIN v1.10 estimate): 5.742
Log Koa (experimental database): None
Probability of Rapid Biodegradation (BIOWIN v4.10):
Biowin1 (Linear Model) : 0.8467
Biowin2 (Non-Linear Model) : 0.9430
Expert Survey Biodegradation Results:
Biowin3 (Ultimate Survey Model): 2.6736 (weeks-months)
Biowin4 (Primary Survey Model) : 3.4456 (days-weeks )
MITI Biodegradation Probability:
Biowin5 (MITI Linear Model) : 0.3428
Biowin6 (MITI Non-Linear Model): 0.3150
Anaerobic Biodegradation Probability:
Biowin7 (Anaerobic Linear Model): -0.2042
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): 27.6 Pa (0.207 mm Hg)
Log Koa (Koawin est ): 5.742
Kp (particle/gas partition coef. (m3/ug)):
Mackay model : 1.09E-007
Octanol/air (Koa) model: 1.36E-007
Fraction sorbed to airborne particulates (phi):
Junge-Pankow model : 3.93E-006
Mackay model : 8.7E-006
Octanol/air (Koa) model: 1.08E-005
Atmospheric Oxidation (25 deg C) [AopWin v1.92]:
Hydroxyl Radicals Reaction:
OVERALL OH Rate Constant = 3.2830 E-12 cm3/molecule-sec
Half-Life = 3.258 Days (12-hr day; 1.5E6 OH/cm3)
Half-Life = 39.096 Hrs
Ozone Reaction:
No Ozone Reaction Estimation
Fraction sorbed to airborne particulates (phi):
6.31E-006 (Junge-Pankow, Mackay avg)
1.08E-005 (Koa method)
Note: the sorbed fraction may be resistant to atmospheric oxidation
Soil Adsorption Coefficient (KOCWIN v2.00):
Koc : 296.8 L/kg (MCI method)
Log Koc: 2.472 (MCI method)
Koc : 294.1 L/kg (Kow method)
Log Koc: 2.469 (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 = 1.035 (BCF = 10.84 L/kg wet-wt)
Log Biotransformation Half-life (HL) = -0.7143 days (HL = 0.1931 days)
Log BCF Arnot-Gobas method (upper trophic) = 1.032 (BCF = 10.76)
Log BAF Arnot-Gobas method (upper trophic) = 1.032 (BAF = 10.76)
log Kow used: 2.07 (estimated)
Volatilization from Water:
Henry LC: 5.21E-006 atm-m3/mole (estimated by Bond SAR Method)
Half-Life from Model River: 132.3 hours (5.514 days)
Half-Life from Model Lake : 1542 hours (64.23 days)
Removal In Wastewater Treatment:
Total removal: 2.60 percent
Total biodegradation: 0.10 percent
Total sludge adsorption: 2.21 percent
Total to Air: 0.29 percent
(using 10000 hr Bio P,A,S)
Level III Fugacity Model:
Mass Amount Half-Life Emissions
(percent) (hr) (kg/hr)
Air 1.73 78.2 1000
Water 19.8 900 1000
Soil 78.1 1.8e+003 1000
Sediment 0.333 8.1e+003 0
Persistence Time: 1.02e+003 hr