ABSTRACT
NO2 CASRN: 99-08-1; DOT: 1664; DOT label: Poison; molecular formula: C7H7NO2; FW: 137.14; RTECS: XT2975000; Merck Index: 12, 6748 Physical state, color, and odor: Clear, yellowish liquid with an aromatic odor. Odor threshold concentration is 600 ppm (quoted, Amoore and Hautala, 1983). Melting point (°C): 15.44 (Gross et al., 1933) Boiling point (°C): 232.6 (Weast, 1986) Density (g/cm3): 1.1571 at 20 °C (Weast, 1986) 1.14763 at 35.00 °C (Goud et al., 1999) Diffusivity in water (x 10-5 cm2/sec): 0.80 at 20 °C using method of Hayduk and Laudie (1974) Flash point (°C): 107 (NIOSH, 1997) Lower explosive limit (%): 1.6 (NIOSH, 1997) Henry’s law constant (x 10-6 atm⋅m3/mol): 5.41 at 20 °C (approximate - calculated from water solubility and vapor pressure) 9.31 at 25 °C (thermodynamic method-GC/UV spectrophotometry, Altschuh et al., 1999) Interfacial tension with water (dyn/cm at 20 °C): 27.68 (Harkins et al., 1920) Ionization potential (eV): 9.45 (Lias, 1998) Soil organic carbon/water partition coefficient, log Koc: Kd = 18 mL/g on a Cs+-kaolinite (Haderlein and Schwarzenbach, 1993) Octanol/water partition coefficient, log Kow: 2.40 (quoted, Leo et al., 1971) 2.42 at 25 °C (shake flask-UV spectrophotometry, Fujita et al., 1964)
Soluble in alcohol, benzene, and ether (Weast, 1986) Solubility in water: 498 mg/kg at 30 °C (shake flask-interferometer, Gross et al., 1933) In mg/L: 450 at 10.00 °C, 491 at 20.00 °C, 534 at 30 °C (shake flask-UV spectrophotometry,
Beneš and Dohnal, 1999) Vapor density: 5.61 g/L at 25 °C, 4.73 (air = 1) Vapor pressure (mmHg): 0.1 at 20 °C (NIOSH, 1987) 0.25 at 25 °C (quoted, Verschueren, 1983) Environmental fate: Biological. Under anaerobic conditions using a sewage inoculum, 3-nitrotoluene and 4nitrotoluene both degraded to toluidine (Hallas and Alexander, 1983). Robertson et al. (1992) reported that toluene dioxygenases from Pseudomonas putida F1 and Pseudomonas sp. Strain JS 150 oxidized the methyl group forming 3-nitrobenzyl alcohol. Exposure limits: NIOSH REL: TWA 2 ppm (11 mg/m3), IDLH 200 ppm; OSHA PEL: TWA 5 ppm (30 mg/m3); ACGIH TLV: TWA 2 ppm (adopted). Toxicity: Acute oral LD50 for guinea pigs 3,600 mg/kg, mice 330 mg/kg, rats 1,072 mg/kg, rabbits 2,400 (quoted, RTECS, 1985). Uses: Manufacture of dyes, nitrobenzoic acids, toluidines; organic synthesis.
