ABSTRACT
CH3O CASRN: 4170-30-3; DOT: 1143; DOT label: Flammable liquid; molecular formula: C4H6O; FW: 70.09; RTECS: GP9499000; Merck Index: 12, 2663 Physical state, color, and odor: Clear, colorless to straw-colored liquid with a pungent, irritating, suffocating odor. An odor threshold concentration of 23 ppbv was reported by Nagata and Takeuchi (1990). Katz and Talbert (1930) reported experimental detection odor threshold concentrations ranged from 180 to 570 µg/m3 (63 to 200 ppbv). Melting point (°C): -74 (Weast, 1986) -76.5 (Windholz et al., 1983) Boiling point (°C): 104-105 (Weast, 1986) 101-103 (Acros Organics, 2002) Density (g/cm3): 0.853 at 20/20 °C (Weast, 1986) 0.8477 at 20.5 °C (Huntress and Mulliken, 1941) Diffusivity in water (x 10-5 cm2/sec): 0.99 at 20 °C using method of Hayduk and Laudie (1974) Flash point (°C): 7.2 (NIOSH, 1997) 13 (open cup, Windholz et al., 1983) Lower explosive limit (%): 2.1 (NIOSH, 1997) Upper explosive limit (%): 15.5 (NIOSH, 1997) Henry’s law constant (x 10-5 atm⋅m3/mol): 1.92 (Buttery et al., 1971) Ionization potential (eV): 9.73 ± 0.01 (Franklin et al., 1969) Soil organic carbon/water partition coefficient, log Koc: Unavailable because experimental methods for estimation of this parameter for aldehydes are lacking in the documented literature. However, its high solubility in water suggests its adsorption to soil will be nominal (Lyman et al., 1982).
