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CAS Num: 001191-08-8


CHEM : 1,4-Butanedithiol

MOL FOR: C4 H10 S2

MOL WT : 122.24

------------------------------ 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) = 2.19

Boiling Pt, Melting Pt, Vapor Pressure Estimations (MPBPWIN v1.43):

Boiling Pt (deg C): 184.21 (Adapted Stein & Brown method)

Melting Pt (deg C): -35.75 (Mean or Weighted MP)

VP(mm Hg,25 deg C): 0.451 (Mean VP of Antoine & Grain methods)

VP (Pa, 25 deg C) : 60.2 (Mean VP of Antoine & Grain methods)

MP (exp database): -53.9 deg C

BP (exp database): 195.5 deg C

Water Solubility Estimate from Log Kow (WSKOW v1.41):

Water Solubility at 25 deg C (mg/L): 1319

log Kow used: 2.19 (estimated)

no-melting pt equation used

Water Sol Estimate from Fragments:

Wat Sol (v1.01 est) = 259.41 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 : 2.17E-004 atm-m3/mole (2.20E+001 Pa-m3/mole)

Group Method: 4.06E-005 atm-m3/mole (4.11E+000 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: 5.500E-005 atm-m3/mole (5.572E+000 Pa-m3/mole)

VP: 0.451 mm Hg (source: MPBPVP)

WS: 1.32E+003 mg/L (source: WSKOWWIN)

Log Octanol-Air Partition Coefficient (25 deg C) [KOAWIN v1.10]:

Log Kow used: 2.19 (KowWin est)

Log Kaw used: -2.052 (HenryWin est)

Log Koa (KOAWIN v1.10 estimate): 4.242

Log Koa (experimental database): None

Probability of Rapid Biodegradation (BIOWIN v4.10):

Biowin1 (Linear Model) : 0.6893

Biowin2 (Non-Linear Model) : 0.7812

Expert Survey Biodegradation Results:

Biowin3 (Ultimate Survey Model): 2.9290 (weeks )

Biowin4 (Primary Survey Model) : 3.6714 (days-weeks )

MITI Biodegradation Probability:

Biowin5 (MITI Linear Model) : 0.5461

Biowin6 (MITI Non-Linear Model): 0.6714

Anaerobic Biodegradation Probability:

Biowin7 (Anaerobic Linear Model): 0.9400

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): 54.9 Pa (0.412 mm Hg)

Log Koa (Koawin est ): 4.242

Kp (particle/gas partition coef. (m3/ug)):

Mackay model : 5.46E-008

Octanol/air (Koa) model: 4.29E-009

Fraction sorbed to airborne particulates (phi):

Junge-Pankow model : 1.97E-006

Mackay model : 4.37E-006

Octanol/air (Koa) model: 3.43E-007

Atmospheric Oxidation (25 deg C) [AopWin v1.92]:

Hydroxyl Radicals Reaction:

OVERALL OH Rate Constant = 85.7477 E-12 cm3/molecule-sec

Half-Life = 0.125 Days (12-hr day; 1.5E6 OH/cm3)

Half-Life = 1.497 Hrs

Ozone Reaction:

No Ozone Reaction Estimation

Fraction sorbed to airborne particulates (phi):

3.17E-006 (Junge-Pankow, Mackay avg)

3.43E-007 (Koa method)

Note: the sorbed fraction may be resistant to atmospheric oxidation

Soil Adsorption Coefficient (KOCWIN v2.00):

Koc : 131.5 L/kg (MCI method)

Log Koc: 2.119 (MCI method)

Koc : 79.49 L/kg (Kow method)

Log Koc: 1.900 (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 = 1.114 (BCF = 13 L/kg wet-wt)

Log Biotransformation Half-life (HL) = -1.0797 days (HL = 0.08323 days)

Log BCF Arnot-Gobas method (upper trophic) = 1.014 (BCF = 10.33)

Log BAF Arnot-Gobas method (upper trophic) = 1.014 (BAF = 10.33)

log Kow used: 2.19 (estimated)

Volatilization from Water:

Henry LC: 4.06E-005 atm-m3/mole (estimated by Group SAR Method)

Half-Life from Model River: 17.07 hours

Half-Life from Model Lake : 278.9 hours (11.62 days)

Removal In Wastewater Treatment:

Total removal: 4.56 percent

Total biodegradation: 0.10 percent

Total sludge adsorption: 2.33 percent

Total to Air: 2.14 percent

(using 10000 hr Bio P,A,S)

Level III Fugacity Model:

Mass Amount Half-Life Emissions

(percent) (hr) (kg/hr)

Air 0.389 2.99 1000

Water 26.1 360 1000

Soil 73.3 720 1000

Sediment 0.184 3.24e+003 0

Persistence Time: 415 hr

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