ABSTRACT
CASRN: 92-67-1; DOT: 2811; molecular formula: C12H11N; FW: 169.23; RTECS: DU8925000; Merck Index: 12, 1276 Physical state, color, and odor: Colorless to yellow-brown crystalline solid with a floral-like odor. Becomes purple on exposure to air. Melting point (°C): 53-54 (Weast, 1986) 50-52 (Sittig, 1985) Boiling point (°C): 302 (Weast, 1986) Density (g/cm3): 1.160 at 20/20 °C (Sax and Lewis, 1987) Diffusivity in water (x 10-5 cm2/sec): 0.59 at 20 °C using method of Hayduk and Laudie (1974) Dissociation constant, pKa: 4.27 at 25 °C (Dean, 1987) Henry’s law constant (x 1010 atm⋅m3/mol): 3.89 at 25 °C (calculated, Mercer et al., 1990) Ionization potential (eV): 7.49 (Farrell and Newton, 1966) Soil organic carbon/water partition coefficient, log Koc: 2.03 (calculated, Mercer et al., 1990) Octanol/water partition coefficient, log Kow: 2.86 at pH 7.5 (shake flask-UV spectrophotometry, Martin-Vollodre et al., 1986) Solubility in organics: Soluble in alcohol, chloroform, and ether (Weast, 1986) Solubility in water: 842 mg/L at 20-30 °C (quoted, Mercer et al., 1990) Vapor pressure (mmHg): 6 x 10-5 at 20-30 °C (quoted, Mercer et al., 1990)
NIOSH (1997) recommends the most reliable and protective respirators be used, i.e., a selfcontained breathing apparatus that has a full facepiece and is operated under positive-pressure or a supplied-air respirator that has a full facepiece and is operated under pressure-demand or under positive-pressure in combination with a self-contained breathing apparatus operated under pressure-demand or positive-pressure. OSHA recommends that worker exposure to this chemical is to be controlled by use of engineering control, proper work practices, and proper selection of personal protective equipment. Specific details of these requirements can be found in CFR 1910.1003-1910.1016. Symptoms of exposure: Headache, dizziness, lethargy, dyspnea, ataxia, weakness, urinary burning (NIOSH, 1994) Toxicity: Acute oral LD50 for rats 200 mg/kg, mice 50 mg/kg (quoted, Verschueren, 1983). Uses: Detecting sulfates; formerly used as a rubber antioxidant; cancer research. May be an impurity in azo dyes.
