ABSTRACT
CASRN: 2698-41-1; molecular formula: C10H5ClN2; FW: 188.61; RTECS: OO3675000; Merck Index: 12, 2178 Physical state, color, and odor: White crystalline solid with a pepper-like odor Melting point (°C): 95-96 (Windholz et al., 1983) Boiling point (°C): 310-315 (Windholz et al., 1983) Density (g/cm3): 1.472 using method of Lyman et al. (1982) Diffusivity in water: Not applicable - reacts with water Lower explosive limit: For a dust, 25 mg/m3 is the minimum explosive concentration in air (NIOSH, 1997). Henry’s law constant (atm⋅m3/mol): Not applicable - reacts with water Soil organic carbon/water partition coefficient, log Koc: Not applicable - reacts with water Octanol/water partition coefficient, log Kow: Not applicable - reacts with water Solubility in organics: Soluble in acetone, benzene, 1,4-dioxane, ethyl acetate, and methylene chloride (Windholz et al., 1983) Solubility in water: Not applicable - reacts with water Vapor pressure (mmHg): 3 x 10-5 at 20 °C (NIOSH, 1997)
Chemical/Physical. Hydrolyzes in water forming 2-chlorobenzaldehyde and malononitrile (quoted, Verschueren, 1983). Exposure limits: NIOSH REL: ceiling 0.05 ppm (0.4 mg/m3), IDLH 2 mg/m3; OSHA PEL: TWA 0.05 ppm; ACGIH TLV: ceiling 0.05 ppm (adopted). Symptoms of exposure: An irritation concentration of 1.52 mg/m3 in air was reported by Ruth (1986). Toxicity: After 12, 24, 48, and 96 h, observed LC50 concentrations were 1.28, 0.45, 0.42, and 0.22 mg/L, respectively (Abram and Wilson, 1979). Acute oral LD50 for rats 178 mg/kg, guinea pigs 212 mg/kg, rabbits 143 mg/kg, mice 282 mg/kg (quoted, RTECS, 1985). Uses: Riot control agent.
