ABSTRACT
H2N CH3 CASRN: 74-89-5; DOT: 1061; DOT label: Flammable gas (anhydrous)/flammable liquid; molecular formula: CH5N; FW: 31.06; RTECS: PF6300000; Merck Index: 12, 6095 Physical state, color, and odor: Colorless, flammable gas with a strong ammonia-like odor. An experimentally determined recognition odor threshold concentration of 21 ppbv was reported by Leonardos et al. (1969). Odor threshold concentrations of 4.7 ppmv and 35 ppbv were experimentally determined by Nishida et al. (1979) and Nagata and Takeuchi (1990), respectively. Melting point (°C): -93.5 (Weast, 1986) Boiling point (°C): -6.3 (Weast, 1986) Density (g/cm3): 0.6628 at 20 °C (Weast, 1986) Diffusivity in water (x 10-5 cm2/sec): 1.38 at 20 °C using method of Hayduk and Laudie (1974) Dissociation constant, pKa: 10.657 at 25 °C (Gordon and Ford, 1972) Flash point (°C): -62, -4, -11, and -23 at 0, 25, 40, and 50 wt % aqueous solutions, respectively (Mitchell et al., 1999) Lower explosive limit (%): 4.9 (NFPA, 1984) Upper explosive limit (%): 20.7 (NFPA, 1984) Heat of fusion (kcal/mol): 1.466 (Dean, 1987) Henry’s law constant (x 10-5 atm⋅m3/mol): 1.11 at 25 °C (Christie and Crisp, 1967) Ionization potential (eV): 9.18 (Gibson et al., 1977) Soil organic carbon/water partition coefficient, log Koc: Unavailable because experimental methods for estimation of this parameter for aliphatic amines
ow its adsorption to soil will be nominal (Lyman et al., 1982). Octanol/water partition coefficient, log Kow: -0.57 at 20.0 °C (shake flask-Kjeldahl analysis, Collander, 1951) Solubility in organics: Soluble in benzene (105 g/L at 25 °C) and miscible with ether (Windholz et al., 1983) Solubility in water: 1,154 volumes at 12.5 °C, 959 volumes at 25 °C (quoted, Windholz et al., 1983) 0.457 as mole fraction (quoted, interpolated, Copley et al., 1941) Vapor density: 1.27 g/L at 25 °C, 1.07 (air = 1) Vapor pressure (mmHg): 2,356 at 20 °C, 3,268 at 30 °C (quoted, Verschueren, 1983) Environmental fate: Photolytic. The rate constant for the reaction of methylamine and OH radicals in the atmosphere at 300 K is 1.3 x 10-13 cm3/molecule⋅sec (Hendry and Kenley, 1979). Low et al. (1991) reported that the photooxidation of aqueous primary amine solutions by UV light in the presence of titanium dioxide resulted in the formation of ammonium and nitrate ions. Chemical/Physical. In an aqueous solution, chloramine reacted with methylamine to form Nchloromethylamine (Isaac and Morris, 1983). Reacts with acids forming water-soluble salts. Exposure limits: NIOSH REL: TWA 10 ppm (12 mg/m3), IDLH 100 ppm; OSHA PEL: TWA 10 ppm; ACGIH TLV: TWA 5 ppm, STEL 15 ppm (adopted). Symptoms of exposure: Severe irritant to eyes, skin, and respiratory tract (Patnaik, 1992). An irritation concentration of 30.00 mg/m3 in air was reported by Ruth (1986). Toxicity: LC50 (inhalation) for mice 2,400 mg/kg/2-h (quoted, RTECS, 1985). Source: Methylamine was detected in cauliflower (65 ppm), carrots (3,970 ppm), tea leaves (50 ppm), red and white cabbage (3.4 to 22.7 ppm), corn (27 ppm), kale leaves (16.6 ppm), barley seeds (4.5 ppm), epidermis of apples (4.5 ppm), celery (6.4 ppm), sweetflag, celandine, and tobacco leaves (Duke, 1992). Uses: Tanning; intermediate for accelerators, dyes, pharmaceuticals, insecticides, fungicides, tanning, surface active agents, fuel additive, dyeing of acetate textiles; polymerization inhibitor; ingredient in paint removers; photographic developer; solvent; rocket propellant; fuel additive; solvent; in organic synthesis.
