PENTACOSANE

n-Pentacosane

629-99-2

N-PENTACOSANE-D52

UNII-BON9H94Y8V

BON9H94Y8V

121578-13-0

EINECS 211-123-6

NSC 158663

NSC-158663

AI3-36478

DTXSID2060882

CHEBI:32938

HSDB 8355

MFCD00009353

Pentacosane, analytical standard

CH3-(CH2)23-CH3

CH3-[CH2]23-CH3

Pentacosane, 99%

DTXCID7043584

HY-N7494

LMFA11000582

NSC158663

AKOS015843190

LS-15134

Pentacosane; NSC 158663; n-Pentacosane

DB-054365

CS-0130240

NS00010787

P0139

D91907

Q151007

2A4605C9-A088-458C-AD58-AA987FF6C408

The Henry's Law constant for pentacosane is estimated as 370 atm-cu m/mole(SRC) using a fragment constant estimation method(1). This Henry's Law constant indicates that pentacosane is expected to volatilize rapidly from water surfaces(2). Based on this Henry's Law constant, the volatilization half-life from a model river (1 m deep, flowing 1 m/sec, wind velocity of 3 m/sec)(3) is estimated as 1.9 hours(SRC). The volatilization half-life from a model lake (1 m deep, flowing 0.05 m/sec, wind velocity of 0.5 m/sec)(3) is estimated as 7.4 days(SRC). However, adsorption to sediment and suspended solids is expected to attenuate volatilization(SRC). The estimated volatilization half-life from a model pond is greater than 2 years if adsorption is considered(4). Pentacosane is not expected to volatilize from dry soil surfaces(SRC) based upon a vapor pressure of 1.51X10-6 mm Hg(5).
Literature: (1) Meylan WM, Howard PH; Environ Toxicol Chem 10: 1283-93 (1991) (2) Lyman WJ et al; Handbook of Chemical Property Estimation Methods. Washington, DC: Amer Chem Soc pp. 15-1 to 15-29 (1990) (3) US EPA; Estimation Program Interface (EPI) Suite. Ver. 4.1. Nov, 2012. Available from, as of Nov 17, 2016: http://www2.epa.gov/tsca-screening-tools (4) US EPA; EXAMS II Computer Simulation (1987) (5) Perry RH, Green D; Perry's Chemical Handbook. Physical and Chemical Data 6th ed., New York, NY: McGraw Hill (1984)

In water, 2.046X10-8 mg/L at 25 deg C (est)
Literature: US EPA; Estimation Program Interface (EPI) Suite. Ver. 4.1. Nov, 2012. Available from, as of Nov 17, 2016: http://www2.epa.gov/tsca-screening-tools
Literature: #Soluble in benzene, chloroform
Literature: Haynes, W.M. (ed.). CRC Handbook of Chemistry and Physics. 95th Edition. CRC Press LLC, Boca Raton: FL 2014-2015, p. 3-436

The Koc of pentacosane is estimated as 1.2X10+7(SRC), using an estimated log Kow of 12.62(1) and a regression-derived equation(2). According to a classification scheme(3), this estimated Koc value suggests that pentacosane is expected to be immobile in soil.
Literature: (1) US EPA; Estimation Program Interface (EPI) Suite. Ver. 4.1. Nov, 2012. Available from, as of Nov 17, 2016: http://www2.epa.gov/tsca-screening-tools (2) Swann RL et al; Res Rev 85: 17-28 (1983)