ABSTRACT
CASRN: 540-88-5; DOT: 1123; DOT label: Flammable liquid; molecular formula: C6H12O2; FW: 116.16; RTECS: AF7400000; Merck Index: 12, 1572 Physical state, color, and odor: Colorless liquid with a fruity odor. Odor threshold concentration in water is 4 ppm (CHRIS, 1994). Nagata and Takeuchi (1990) reported an odor threshold concentration of 71 ppbv. Boiling point (°C): 97-98 (Weast, 1986) Density (g/cm3): 0.88259 at 5 °C, 0.87174 at 15 °C, 0.86057 at 25 °C, 0.84938 at 35 °C, 0.83807 at 45 °C (Sakurai
et al., 1996) 0.86630 at 20.00 °C (Comelli and Francesconi, 1998) Diffusivity in water (x 10-5 cm2/sec): 0.74 at 20 °C using method of Hayduk and Laudie (1974) Flash point (°C): 22.2 (NIOSH, 1997) Lower explosive limit (%): 1.5 (NIOSH, 1997) Soil organic carbon/water partition coefficient, log Koc: Unavailable because experimental methods for estimation of this parameter for aliphatic esters are lacking in the documented literature. Octanol/water partition coefficient, log Kow: 1.75 (shake flask, Hansch et al., 1995) Solubility in organics: Miscible with alcohol and ether (Windholz et al., 1983) Solubility in water (wt %): 1.170 at 0.0 °C, 1.000 at 9.2 °C, 0.803 at 19.2 °C, 0.703 at 29.6 °C, 0.620 at 40.0 °C, 0.573 at 50.0 °C, 0.526 at 60.5 °C, 0.538 at 70.5 °C, 0.499 at 80.5 °C (shake flask-GC, Stephenson and Stuart, 1986) Vapor density: 4.75 g/L at 25 °C, 4.01 (air = 1)
Chemical/Physical. Hydrolyzes in water to tert-butyl alcohol and acetic acid. The estimated hydrolysis half-life at 25 °C and pH 7 is 140 yr (Mabey and Mill, 1978). Exposure limits: NIOSH REL: TWA 200 ppm (950 mg/m3), IDLH 1,500 ppm; OSHA PEL: TWA 200 ppm; ACGIH TLV: TWA 200 ppm (adopted). Symptoms of exposure: Exposure to vapors may cause irritation to eyes and respiratory passages; narcotic at high concentrations (Patnaik, 1992). Uses: Gasoline additive; solvent.
