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Environmental fate & pathways

Biodegradation in soil

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Description of key information

Based on the available studies on biodegradation, the substances are estimated to be readily biodegradable,  thus there is no requirement for performing a soil biodegradation test. 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

Half-life in soil:
30 000 d
at the temperature of:
12 °C

Additional information

Based on the available studies on biodegradation, the substances are estimated to be readily biodegradable, thus there is no requirement for performing a soil biodegradation test (Annex IX. 9.2.1.3). No simulation tests for degradation rates under environmental conditions are available, therefore the default values suggested by the REACH guidance are used.

The Kpsoil was determined as 43274 L/kg. The suggested maximum half-life for a readily degradable substance with a Kpsoil in the range >10000 and < 100000 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 primary fatty amine ethoxylates 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).