Tetrasulfane H2S4 structure

H2S4 structure
Molecular Formula H2S4
Average mass 130.276 Da
Density 1.5±0.1 g/cm3
Boiling Point
Flash Point
Molar Refractivity 33.8±0.3 cm3
Polarizability 13.4±0.5 10-24cm3
Surface Tension 61.9±3.0 dyne/cm
Molar Volume 84.6±3.0 cm3

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

Density: 1.5±0.1 g/cm3
Boiling Point:
Vapour Pressure:
Enthalpy of Vaporization:
Flash Point:
Index of Refraction: 1.732
Molar Refractivity: 33.8±0.3 cm3
#H bond acceptors: 0
#H bond donors: 0
#Freely Rotating Bonds: 3
#Rule of 5 Violations: 0
ACD/LogP: 3.71
ACD/LogD (pH 5.5):
ACD/BCF (pH 5.5):
ACD/KOC (pH 5.5):
ACD/LogD (pH 7.4):
ACD/BCF (pH 7.4):
ACD/KOC (pH 7.4):
Polar Surface Area: 128 Å2
Polarizability: 13.4±0.5 10-24cm3
Surface Tension: 61.9±3.0 dyne/cm
Molar Volume: 84.6±3.0 cm3

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

 Boiling Pt, Melting Pt, Vapor Pressure Estimations (MPBPWIN v1.42):
 Boiling Pt (deg C): 584.67 (Adapted Stein & Brown method)
 Melting Pt (deg C): 233.85 (Mean or Weighted MP)
 VP(mm Hg,25 deg C): 1.04E-012 (Modified Grain method)
 Subcooled liquid VP: 1.85E-010 mm Hg (25 deg C, Mod-Grain method)

 Water Solubility Estimate from Log Kow (WSKOW v1.41):
 Water Solubility at 25 deg C (mg/L): 1.984e+004
 log Kow used: 0.78 (estimated)
 no-melting pt equation used

 Water Sol Estimate from Fragments:
 Wat Sol (v1.01 est) = 11024 mg/L

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

 Henrys Law Constant (25 deg C) [HENRYWIN v3.10]:
 Bond Method : 3.20E-002 atm-m3/mole
 Group Method: Incomplete
 Henrys LC [VP/WSol estimate using EPI values]: 8.984E-018 atm-m3/mole

 Log Octanol-Air Partition Coefficient (25 deg C) [KOAWIN v1.10]:
 Log Kow used: 0.78 (KowWin est)
 Log Kaw used: 0.117 (HenryWin est)
 Log Koa (KOAWIN v1.10 estimate): 0.663
 Log Koa (experimental database): None

 Probability of Rapid Biodegradation (BIOWIN v4.10):
 Biowin1 (Linear Model) : 0.6855
 Biowin2 (Non-Linear Model) : 0.7612
 Expert Survey Biodegradation Results:
 Biowin3 (Ultimate Survey Model): 2.9113 (weeks )
 Biowin4 (Primary Survey Model) : 3.6598 (days-weeks )
 MITI Biodegradation Probability:
 Biowin5 (MITI Linear Model) : 0.3246
 Biowin6 (MITI Non-Linear Model): 0.2254
 Anaerobic Biodegradation Probability:
 Biowin7 (Anaerobic Linear Model): 0.8361
 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): 2.47E-008 Pa (1.85E-010 mm Hg)
 Log Koa (Koawin est ): 0.663
 Kp (particle/gas partition coef. (m3/ug)):
 Mackay model : 122 
 Octanol/air (Koa) model: 1.13E-012 
 Fraction sorbed to airborne particulates (phi):
 Junge-Pankow model : 1 
 Mackay model : 1 
 Octanol/air (Koa) model: 9.04E-011 

 Atmospheric Oxidation (25 deg C) [AopWin v1.92]:
 Hydroxyl Radicals Reaction:
 OVERALL OH Rate Constant = 225.0000 E-12 cm3/molecule-sec
 Half-Life = 0.048 Days (12-hr day; 1.5E6 OH/cm3)
 Half-Life = 0.570 Hrs
 Ozone Reaction:
 No Ozone Reaction Estimation
 Fraction sorbed to airborne particulates (phi): 1 (Junge,Mackay)
 Note: the sorbed fraction may be resistant to atmospheric oxidation

 Soil Adsorption Coefficient (PCKOCWIN v1.66):
 Koc : 43.79
 Log Koc: 1.641 

 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 = 0.500 (BCF = 3.162)
 log Kow used: 0.78 (estimated)

 Volatilization from Water:
 Henry LC: 0.032 atm-m3/mole (estimated by Bond SAR Method)
 Half-Life from Model River: 1.186 hours
 Half-Life from Model Lake : 108.6 hours (4.526 days)

 Removal In Wastewater Treatment:
 Total removal: 92.56 percent
 Total biodegradation: 0.02 percent
 Total sludge adsorption: 0.38 percent
 Total to Air: 92.16 percent
 (using 10000 hr Bio P,A,S)

 Level III Fugacity Model:
 Mass Amount Half-Life Emissions
 (percent) (hr) (kg/hr)
 Air 2.01 1.14 1000 
 Water 95.1 360 1000 
 Soil 2.66 720 1000 
 Sediment 0.184 3.24e+003 0 
 Persistence Time: 65.7 hr




 

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