ABSTRACT
CASRN: 122-66-7; molecular formula: C12H12N2; FW: 184.24; RTECS: MW2625000 Physical state and color: Colorless to pale yellow to orange crystals Melting point (°C): 131 (Weast, 1986) 126-128 (Fluka, 1988) Boiling point (°C): Decomposes near the melting point (U.S. EPA, 1980a) Density (g/cm3): 1.158 at 16 °C (Weast, 1986) Diffusivity in water (x 10-5 cm2/sec): 0.57 at 20 °C using method of Hayduk and Laudie (1974) Henry’s law constant (x 10-11 atm⋅m3/mol): 4.11 at 25 °C (approximate - calculated from water solubility and vapor pressure) Ionization potential (eV): 7.78 (Lias et al., 1998) Soil organic carbon/water partition coefficient, log Koc: 2.82 using method of Karickhoff et al. (1979) Octanol/water partition coefficient, log Kow: 2.94 (Mabey et al., 1982) Solubility in organics: Soluble in ethanol (Weast, 1986). Solubility in water: 221 mg/L at 25 °C (U.S. EPA, 1980a) Vapor pressure (mmHg): 2.6 x 10-5 at 25 °C (Mabey et al., 1982) Environmental fate: Biological. When 5 and 10 mg/L of diphenylhydrazine was statically incubated in the dark at 25 °C with yeast extract and settled domestic wastewater inoculum, 80 and 72% biodegradation, respectively, were observed after 7 d (Tabak et al., 1981).
