ABSTRACT
CASRN: 106-51-4; DOT: 2587; DOT label: Poison; molecular formula: C6H4O2; FW: 108.10; RTECS: DK2625000; Merck Index: 12, 8259 Physical state, color, and odor: Light yellow crystals with an acrid odor resembling chlorine. Odor threshold concentration is 84 ppb (quoted, Amoore and Hautala, 1983). Melting point (°C): 115-117 (Weast, 1986) Boiling point (°C): Sublimes (Weast, 1986) Density (g/cm3): 1.318 at 20 °C (Weast, 1986) Diffusivity in water (x 10-5 cm2/sec): 0.87 at 20 °C using method of Hayduk and Laudie (1974) Flash point (°C): 38-94 (NIOSH, 1997) Entropy of fusion (cal/mol⋅K): 11.4 (Andrews et al., 1926) Heat of fusion (kcal/mol): 4.4096 (Andrews et al., 1926) Ionization potential (eV): 9.67 ± 0.02 (Franklin et al., 1969) 10.0 (Lias, 1998) Soil organic carbon/water partition coefficient, log Koc: Unavailable because experimental methods for estimation of this parameter for quinones are lacking in the documented literature Octanol/water partition coefficient, log Kow: 0.20 (quoted, Leo et al., 1971) Solubility in organics: Soluble in alcohol, ether (Weast, 1986), and hot petroleum ether (Windholz et al., 1983)
0.1 at 20 °C (NIOSH, 1997) Exposure limits: NIOSH REL: TWA 0.4 mg/m3 (0.1 ppm), IDLH 100 mg/m3; OSHA PEL: TWA 0.4 mg/m3; ACGIH TLV: TWA 0.1 ppm (adopted). Symptoms of exposure: Prolonged exposure may cause eye irritation. May damage cornea on contact. Contact with skin may cause irritation, ulceration, and necrosis (Patnaik, 1992). An irritation concentration of 2.00 mg/m3 in air was reported by Ruth (1986). Toxicity: Acute oral LD50 for rats 130 mg/kg (quoted, RTECS, 1985). Uses: Oxidizing agent; manufacturing hydroquinone and dyes; in photography; strengthening animal fibers; tanning hides; analytical reagent; making gelatin insoluble; fungicides.
