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Environmental fate & pathways

Bioaccumulation: aquatic / sediment

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Description of key information

Waived

Key value for chemical safety assessment

BCF (aquatic species):
12.36 L/kg ww

Additional information

Relatively little information was found pertaining specifically to the bioaccumulation of dichlorodifluoromethane. Neely et al. (1974) have shown that bioaccumulation is directly related to the octanol/water partition coefficient (P) of the compound. The experimentally determined log octanol/water partition coefficient (log Low) of dichlorodifluoromethane is reported to be 2.16 (Hansch et al. 1975) indicating that dichlorodifluoromethane is not particularly lipophilic and that bioaccumulation in organisms will be limited under conditions of constant exposure. Evidence that dichlorodifluoromethane does not significantly bioaccumulate in organisms was given in the paper by Howard et al (1975). The fact that dichlorodifluoromethane has a high vapour pressure (566.6 kPa at 20°C), and consequently is very volatile, actively excludes persistence in the aquatic environment.