hexamethylcyclotrisiloxane C6H18O3Si3 structure – Flashcards

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

Predicted data is generated using the US Environmental Protection Agency’s EPISuite™

 
 Log Octanol-Water Partition Coef (SRC):
 Log Kow (KOWWIN v1.67 estimate) = 4.47

 Boiling Pt, Melting Pt, Vapor Pressure Estimations (MPBPWIN v1.42):
 Boiling Pt (deg C): 113.51 (Adapted Stein & Brown method)
 Melting Pt (deg C): 1.13 (Mean or Weighted MP)
 VP(mm Hg,25 deg C): 3.29 (Modified Grain method)
 MP (exp database): 64.5 deg C
 BP (exp database): 134 deg C
 VP (exp database): 3.53E+00 mm Hg at 25 deg C
 Subcooled liquid VP: 8.68 mm Hg (25 deg C, exp database VP )

 Water Solubility Estimate from Log Kow (WSKOW v1.41):
 Water Solubility at 25 deg C (mg/L): 1.571
 log Kow used: 4.47 (estimated)
 no-melting pt equation used

 Water Sol Estimate from Fragments:
 Wat Sol (v1.01 est) = 1.4416 mg/L

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

 Henrys Law Constant (25 deg C) [HENRYWIN v3.10]:
 Bond Method : 6.35E-002 atm-m3/mole
 Group Method: Incomplete
 Henrys LC [VP/WSol estimate using EPI values]: 6.130E-001 atm-m3/mole

 Log Octanol-Air Partition Coefficient (25 deg C) [KOAWIN v1.10]:
 Log Kow used: 4.47 (KowWin est)
 Log Kaw used: 0.414 (HenryWin est)
 Log Koa (KOAWIN v1.10 estimate): 4.056
 Log Koa (experimental database): None

 Probability of Rapid Biodegradation (BIOWIN v4.10):
 Biowin1 (Linear Model) : 0.6416
 Biowin2 (Non-Linear Model) : 0.4625
 Expert Survey Biodegradation Results:
 Biowin3 (Ultimate Survey Model): 2.7076 (weeks-months)
 Biowin4 (Primary Survey Model) : 3.5268 (days-weeks )
 MITI Biodegradation Probability:
 Biowin5 (MITI Linear Model) : 0.0528
 Biowin6 (MITI Non-Linear Model): 0.0223
 Anaerobic Biodegradation Probability:
 Biowin7 (Anaerobic Linear Model): 0.3587
 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): 1.16E+003 Pa (8.68 mm Hg)
 Log Koa (Koawin est ): 4.056
 Kp (particle/gas partition coef. (m3/ug)):
 Mackay model : 2.59E-009 
 Octanol/air (Koa) model: 2.79E-009 
 Fraction sorbed to airborne particulates (phi):
 Junge-Pankow model : 9.36E-008 
 Mackay model : 2.07E-007 
 Octanol/air (Koa) model: 2.23E-007 

 Atmospheric Oxidation (25 deg C) [AopWin v1.92]:
 Hydroxyl Radicals Reaction:
 OVERALL OH Rate Constant = 0.8976 E-12 cm3/molecule-sec
 Half-Life = 11.916 Days (12-hr day; 1.5E6 OH/cm3)
 Ozone Reaction:
 No Ozone Reaction Estimation
 Fraction sorbed to airborne particulates (phi): 1.51E-007 (Junge,Mackay)
 Note: the sorbed fraction may be resistant to atmospheric oxidation

 Soil Adsorption Coefficient (PCKOCWIN v1.66):
 Koc : 2221
 Log Koc: 3.347 

 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 = 2.739 (BCF = 548.8)
 log Kow used: 4.47 (estimated)

 Volatilization from Water:
 Henry LC: 0.0635 atm-m3/mole (estimated by Bond SAR Method)
 Half-Life from Model River: 1.536 hours
 Half-Life from Model Lake : 141.8 hours (5.909 days)

 Removal In Wastewater Treatment (recommended maximum 95%):
 Total removal: 97.13 percent
 Total biodegradation: 0.13 percent
 Total sludge adsorption: 33.71 percent
 Total to Air: 63.29 percent
 (using 10000 hr Bio P,A,S)

 Level III Fugacity Model:
 Mass Amount Half-Life Emissions
 (percent) (hr) (kg/hr)
 Air 14.4 494 1000 
 Water 16.9 900 1000 
 Soil 56.9 1.8e+003 1000 
 Sediment 11.8 8.1e+003 0 
 Persistence Time: 461 hr