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Environmental fate & pathways

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Chlorobenzene is not readily biodegradable. Chlorobenzene can be degraded aerobically by adapted microorganisms in water and in aerated soil layers. Non-adapted microorganisms degrade the substance more slowly. Chlorobenzene is not degraded either in digested sludge or in sediment under anaerobic conditions.

Several Kow values have been published for chlorobenzene ranging from log 2.46 to log 3.79 depending on the used calculation method. These values indicate a low potential for bioaccumulation in biota, but an experimental bioconcentration study with Cyprinus carpio (OECD Guideline 305) showed a negligible potential for bioaccumulation (BCF of 40). Thus, chlorobenzene does not meet the criterion on bioaccumulation in the PBT assessment.

The half-life for photochemical oxidative degradation by OH radicals in the troposphere has been calculated at 18 - 24 days.

Direct photodegradation in water is not possible because chlorobenzene absorbs sunlight extremely weakly. Hydrolysis is also not expected under environmental conditions.