ABSTRACT
Note: Halowax 1051 contains approximately 10 wt % heptachloronaphthlenes and 90 wt % octachloronaphthalene. CASRN: 2234-13-1; molecular formula: C10Cl8; FW: 403.73; RTECS: QK0250000 Physical state, color, and odor: Waxy, light yellow solid with an aromatic odor Melting point (°C): 197-198 (Weast, 1986) Boiling point (°C): 413 (NIOSH, 1997) Density (g/cm3): 2.00 at 20 °C (NIOSH, 1997) Diffusivity in water (x 10-5 cm2/sec): 0.45 at 20 °C using method of Hayduk and Laudie (1974) Flash point (°C): Noncombustible solid (NIOSH, 1997) Bioconcentration factor, log BCF: 2.52 (rainbow trout, Oliver and Niimi, 1985) Octanol/water partition coefficient, log Kow: 7.46 at 25.0 °C (HPLC, Lei et al., 2000) Solubility in organics: Soluble in benzene, chloroform, and ligroin (Weast, 1986) Vapor pressure (mmHg): 4.20 x 10-7 at 25.00 °C (Lei et al., 1999) Exposure limits (mg/m3): NIOSH REL: TWA 0.1, STEL 0.3; OSHA PEL: TWA 0.1; ACGIH TLV: TWA 0.1, STEL, 0,3 (adopted). Toxicity: LC50 (96-h) for Cyprinodon variegatus >560 ppm using natural seawater (Heitmuller et al., 1981). LC50 (48-h) and LC50 (24-h) values for Daphnia magna >525 mg/L (Mayer and Ellersieck,
Heitmuller et al. (1981) reported a NOEC of 560 ppm. Source: Octachloronaphthalene was detected in various technical-grade PCB mixtures as impurities or by-products. Concentrations were 0.098 µg/g in PCB-1016, 0.433 µg/g in PCB1232, 0.378 µg/g in PCB-1248, 3.23 µg/g in PCB-1254, 55.5 µg/g in PCB-1260, and 50.5 µg/g in PCB-1262 (Yamashita et al., 2000). Uses: Chemical research; organic synthesis. According to HSDB (1005), U.S. has discontinued manufacturing of chlorinated naphthalenes since 1977. Chlorinated naphthalenes were formerly used as a wood preservative, additives in cutting oils, and as an additive in fireproofing and waterproofing cable insulation.
