ABSTRACT
NH2 CASRN: 60-34-4; DOT: 1244; DOT label: Flammable liquid; molecular formula: CH6N2; FW: 46.07; RTECS: MV5600000; Merck Index: 12, 6160 Physical state, color, and odor: Fuming, clear, colorless liquid with an ammonia-like odor. Odor threshold concentrations ranged from 1 to 3 ppm (quoted, Keith and Walters, 1992). Melting point (°C): -52.4 (Weast, 1986) Boiling point (°C): 87.5 (Weast, 1986) Density (g/cm3): 0.874 at 25 °C (Weast, 1986) 0.8632 at 30 °C (Ahlert and Shimalla, 1968) Diffusivity in water (x 10-5 cm2/sec): 1.47 at 25 °C using method of Hayduk and Laudie (1974) Flash point (°C): -8.4 (NIOSH, 1997) 21 (Acros Organics, 2002) Lower explosive limit (%): 2.5 (NIOSH, 1997) Upper explosive limit (%): 92 (NFPA, 1984) Entropy of fusion (cal/mol⋅K): 11.279 (Aston et al., 1951) Heat of fusion (kcal/mol): 2.4905 (Aston et al., 1951) Ionization potential (eV): 8.00 ± 0.06 (Franklin et al., 1969) Soil organic carbon/water partition coefficient, log Koc: Experimental methods for estimation of this parameter for hydrazines are lacking in the documented literature. However, its miscibility in water suggests adsorption to soil will be nominal. Octanol/water partition coefficient, log Kow: -1.05 (shake flask, Hansch and Leo, 1987)
Soluble in alcohol and ether (Weast, 1986) Solubility in water: Miscible Vapor density: 1.88 g/L at 25 °C, 1.59 (air = 1) Vapor pressure (mmHg): 12.11 at 1.97 °C, 22.85 at 11.75 °C, 31.76 at 17.14 °C, 38.72 at 20.54 °C, 50.00 at 25.18 (Aston et al., 1951) Environmental fate: Biological. It was suggested that the rapid disappearance of methylhydrazine in sterile and nonsterile soil (Arrendondo fine sand) under aerobic conditions was due to chemical oxidation. Although the oxidation product was not identified, it biodegraded to carbon dioxide in the nonsterile soil. The oxidation product did not degrade in the sterile soil (Ou and Street, 1988). Exposure limits: Potential occupational carcinogen. NIOSH REL: 2-h ceiling 0.04 ppm (0.08 mg/m3), IDLH 20 ppm; OSHA PEL: ceiling 0.2 ppm (0.35 mg/m3); ACGIH TLV: TWA 0.01 ppm (adopted). Toxicity: Acute oral LD50 for hamsters 22 mg/kg, mice 29 mg/kg, rats 32 mg/kg (quoted, RTECS, 1985). Uses: Rocket fuel; solvent; intermediate; organic synthesis.
