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Environmental fate & pathways

Biodegradation in soil

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Description of key information

No simulation tests for degradation rates under environmental conditions are available; therefore  the default values suggested by the REACH guidance are used.  For soil this is a half life value of 30000 days, this can be adapted if better soil data become available.

Key value for chemical safety assessment

Additional information

The Kpsoil was determined as 47000 L/kg. The suggested maximum half-life for a readily degradable substance with a Kpsoil in the range >10000 L/kg is 30000 days for soil (at 12 ºC). These values are considered as extremely conservative but in the absence of measured data will be used in the exposure assessment as a worst-case. The half-life of the bioavailable fraction of Fatty acids C18 unsat. diethylenetriamine imidazoline in the water phase of soils is expected to be in the order of a few days, which is based on experiments with dialkyldimethylammonium salts (van Ginkel et al, 2003).