ABSTRACT
CASRN: 126-73-8; molecular formula: C12H27O4P; FW: 266.32; RTECS: TC7700000; Merck Index: 12, 9749 Physical state, color, and odor: Clear, colorless to pale yellow, odorless, slightly flammable, oily liquid Melting point (°C): -81 (NIOSH, 1997) Boiling point (°C): 289 (Weast, 1986) with decomposition (Windholz et al., 1983) Density (g/cm3): 0.981 at 14.9 °C, 0.976 at 20.1 °C, 0.972 at 25.0 °C, 0.968 at 30.0 °C (De Lorenzi et al., 1997) 0.975 at 25 °C, 0.968 at 30 °C, 0.963 at 35 °C, 0.961 at 40 °C, 0.954 at 45 °C (Swain et al., 1997) Diffusivity in water (x 10-5 cm2/sec): 0.49 at 20 °C using method of Hayduk and Laudie (1974) Flash point (°C): 146 (open cup, NFPA, 1984) Bioconcentration factor, log BCF: 1.04-1.69 (killifish), 0.78-1.04 (goldfish) (Sasaki et al., 1981) Soil organic carbon/water partition coefficient, log Koc: 2.29 (commercial mixture) using method of Kenaga and Goring (1980) Octanol/water partition coefficient, log Kow: 4.00 (commercial mixture, shake flask-GC, Saeger et al., 1979) Solubility in organics: Miscible with alcohol, ether (Sax and Lewis, 1987), and many other organic solvents (Dean, 1987) Solubility in water: 0.0440 wt % at 25.00 °C, 0.0490 wt % at 50.00 °C (Dhouib-Sahnoun et al., 2002) 280 ppm at 20-25 °C (commercial mixture, shake flask-GC, Saeger et al., 1979) In mg/L: 957 at 5.0 °C, 640 at 13.0 °C, 422 at 25.0 °C, 285 at 50.0 °C (Higgins et al., 1959) Vapor density: 10.89 g/L at 25 °C, 9.19 (air = 1)
0.30 at 15 °C, 1.13 at 25 °C (sorbent, trapping/thermal desorption GC, Skene and Krzymien, 1995) Environmental fate: Biological. Indigenous microbes in Mississippi River water degraded tributyl phosphate to carbon dioxide. After 4 wk, 90.8% of the theoretical carbon dioxide had evolved (Saeger et al., 1979). Chemical/Physical. Complete hydrolysis yields 1-butanol and phosphoric acid via the intermediates dibutyl phosphate and monobutyl phosphate (Thomas and Macaskie, 1996). Exposure limits: NIOSH REL: TWA 0.2 ppm (2.5 mg/m3), IDLH 30 mg/m3; OSHA PEL: TWA 5 mg/m3; ACGIH TLV: TWA 0.2 ppm (adopted). Symptoms of exposure: Depression of central nervous system and irritation of skin, eyes, and respiratory tract (Patnaik, 1992) Toxicity: LC50 (48-h) for red killifish 68 mg/L (Yoshioka et al., 1986). Acute oral LD50 for mice 1,189 mg/kg, rats 3,000 mg/kg (quoted, RTECS, 1985). Uses: Plasticizer for lacquers, plastics, cellulose esters, and vinyl resins; heat-exchange liquid; carbonless copy paper systems; in aircraft hydraulic fluids; solvent extraction of metal ions from solution of reactor products; uranium extraction and nuclear fuel reprocessing; pigment grinding assistant; antifoaming agent; solvent for nitrocellulose and cellulose acetate.
