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CAS Number: 71607-26-6


CHEM : hexyl 4-methoxybenzoate

MOL FOR: C14 H20 O3

MOL WT : 236.31

------------------------------ EPI SUMMARY (v4.00) --------------------------

Physical Property Inputs:

Log Kow (octanol-water): ------

Boiling Point (deg C) : ------

Melting Point (deg C) : ------

Vapor Pressure (mm Hg) : ------

Water Solubility (mg/L): ------

Henry LC (atm-m3/mole) : ------

Log Octanol-Water Partition Coef (SRC):

Log Kow (KOWWIN v1.67 estimate) = 4.36

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

Boiling Pt (deg C): 314.98 (Adapted Stein & Brown method)

Melting Pt (deg C): 74.07 (Mean or Weighted MP)

VP(mm Hg,25 deg C): 0.000301 (Modified Grain method)

VP (Pa, 25 deg C) : 0.0402 (Modified Grain method)

Subcooled liquid VP: 0.000878 mm Hg (25 deg C, Mod-Grain method)

: 0.117 Pa (25 deg C, Mod-Grain method)

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

Water Solubility at 25 deg C (mg/L): 5.269

log Kow used: 4.36 (estimated)

no-melting pt equation used

Water Sol Estimate from Fragments:

Wat Sol (v1.01 est) = 5.8919 mg/L

ECOSAR Class Program (ECOSAR v1.00):

Class(es) found:


Henrys Law Constant (25 deg C) [HENRYWIN v3.20]:

Bond Method : 8.47E-006 atm-m3/mole (8.58E-001 Pa-m3/mole)

Group Method: 7.92E-005 atm-m3/mole (8.02E+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: 1.776E-005 atm-m3/mole (1.800E+000 Pa-m3/mole)

VP: 0.000301 mm Hg (source: MPBPVP)

WS: 5.27 mg/L (source: WSKOWWIN)

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

Log Kow used: 4.36 (KowWin est)

Log Kaw used: -3.461 (HenryWin est)

Log Koa (KOAWIN v1.10 estimate): 7.821

Log Koa (experimental database): None

Probability of Rapid Biodegradation (BIOWIN v4.10):

Biowin1 (Linear Model) : 1.0496

Biowin2 (Non-Linear Model) : 0.9996

Expert Survey Biodegradation Results:

Biowin3 (Ultimate Survey Model): 3.0574 (weeks )

Biowin4 (Primary Survey Model) : 4.0819 (days )

MITI Biodegradation Probability:

Biowin5 (MITI Linear Model) : 0.8288

Biowin6 (MITI Non-Linear Model): 0.8947

Anaerobic Biodegradation Probability:

Biowin7 (Anaerobic Linear Model): 0.4573

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): 0.117 Pa (0.000878 mm Hg)

Log Koa (Koawin est ): 7.821

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

Mackay model : 2.56E-005

Octanol/air (Koa) model: 1.63E-005

Fraction sorbed to airborne particulates (phi):

Junge-Pankow model : 0.000925

Mackay model : 0.00205

Octanol/air (Koa) model: 0.0013

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

Hydroxyl Radicals Reaction:

OVERALL OH Rate Constant = 15.1745 E-12 cm3/molecule-sec

Half-Life = 0.705 Days (12-hr day; 1.5E6 OH/cm3)

Half-Life = 8.458 Hrs

Ozone Reaction:

No Ozone Reaction Estimation

Fraction sorbed to airborne particulates (phi):

0.00149 (Junge-Pankow, Mackay avg)

0.0013 (Koa method)

Note: the sorbed fraction may be resistant to atmospheric oxidation

Soil Adsorption Coefficient (KOCWIN v2.00):

Koc : 865.4 L/kg (MCI method)

Log Koc: 2.937 (MCI method)

Koc : 2124 L/kg (Kow method)

Log Koc: 3.327 (Kow method)

Aqueous Base/Acid-Catalyzed Hydrolysis (25 deg C) [HYDROWIN v2.00]:

Total Kb for pH > 8 at 25 deg C : 3.363E-002 L/mol-sec

Kb Half-Life at pH 8: 238.552 days

Kb Half-Life at pH 7: 6.531 years

(Total Kb applies only to esters, carbmates, alkyl halides)

Bioaccumulation Estimates (BCFBAF v3.00):

Log BCF from regression-based method = 2.547 (BCF = 352.2 L/kg wet-wt)

Log Biotransformation Half-life (HL) = -0.3485 days (HL = 0.4482 days)

Log BCF Arnot-Gobas method (upper trophic) = 2.247 (BCF = 176.4)

Log BAF Arnot-Gobas method (upper trophic) = 2.247 (BAF = 176.5)

log Kow used: 4.36 (estimated)

Volatilization from Water:

Henry LC: 7.92E-005 atm-m3/mole (estimated by Group SAR Method)

Half-Life from Model River: 12.93 hours

Half-Life from Model Lake : 270 hours (11.25 days)

Removal In Wastewater Treatment:

Total removal: 49.91 percent

Total biodegradation: 0.45 percent

Total sludge adsorption: 47.48 percent

Total to Air: 1.98 percent

(using 10000 hr Bio P,A,S)

Level III Fugacity Model:

Mass Amount Half-Life Emissions

(percent) (hr) (kg/hr)

Air 1.75 16.9 1000

Water 21.7 360 1000

Soil 75.9 720 1000

Sediment 0.675 3.24e+003 0

Persistence Time: 443 hr

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