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Environmental fate & pathways

Biodegradation in soil

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Reference
Endpoint:
biodegradation in soil: simulation testing
Data waiving:
other justification
Justification for data waiving:
the study does not need to be conducted because direct and indirect exposure of soil is unlikely
other:

Description of key information

No simulation tests for degradation rates under environmental conditions are available.

Exposure of the terrestrial compartment is considered not significant (‘limited exposure’, ‘no significant exposure’). The exposure assessment performed in accordance with section 5 of Annex 1 showed that all terrestrial RCR's are below 0.01.

For the exposure assessment as a worst-case the default half-life as suggested by the REACH guidance are used. This means that for the terrestrial compartment a half life value of 30000 days is used until 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

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).