ABSTRACT
CASRN: 2216-34-4; molecular formula: C9H20; FW: 128.26 Physical state, color, and odor: Clear, colorless, watery, flammable liquid with a faint hydrocarbon odor resembling gasoline or similarly structured alkanes, e.g., 3-methyloctane. Melting point (°C): -113.2 (Weast, 1986) Boiling point (°C): 142.4 (Weast, 1986) Density (g/cm3): 0.7199 at 20 °C, 0.7169 at 25 °C (Dreisbach, 1959) Diffusivity in water (x 10-5 cm2/sec): 0.63 at 20 °C using method of Hayduk and Laudie (1974) Dissociation constant, pKa: >14 (Schwarzenbach et al., 1993) Henry’s law constant (atm⋅m3/mol): 10 at 25 °C (Mackay and Shiu, 1981) Soil organic carbon/water partition coefficient, log Koc: Unavailable because experimental methods for estimation of this parameter for aliphatic hydrocarbons are lacking in the documented literature Octanol/water partition coefficient, log Kow: 4.69 using method of Hansch et al. (1968) Solubility in organics: Soluble in acetone, alcohol, benzene, and ether (Weast, 1986) Solubility in water: 115 µg/kg at 25 °C (shake flask-GLC, Price, 1976) Vapor density: 5.24 g/L at 25 °C, 4.43 (air = 1) Vapor pressure (mmHg): 7 at 25 °C (Wilhoit and Zwolinski, 1971) Environmental fate: Chemical/Physical. Complete combustion of 4-methyloctane in air produces carbon dioxide and
functional group. Exposure limits: ACGIH TLV: TWA for all isomers 200 ppm (adopted). Uses: Gasoline component; organic synthesis.
