Registration Dossier
Registration Dossier
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EC number: 273-282-8 | CAS number: 68955-56-6
Biodegradation in soil
Administrative data
Link to relevant study record(s)
Description of key information
No measured half-life data is available for the soil compartment. In the absence or real measured data the worst-case default half-life based on the biodegradability and sorption are used for risk assessment purposes.
Key value for chemical safety assessment
- Half-life in soil:
- 30 000 d
- at the temperature of:
- 12 °C
Additional information
No measured half-life data is available for the soil compartment. In the absence or real measured data the worst-case default half-life based on the biodegradability and sorption are used for risk assessment purposes.
The Kpsoil was determined as 43664 L/kg. Based on the biodegradability data it can be concluded that the substance is either sorbed or degraded. Due to the relatively high initial test concentration in standard ready tests needed to monitor the degradability, no reproducible result could be obtained in a ready test. In two tests where the toxicity was sufficiently mitigated, >60% degradation was observed. This is a strong indication that the substance is readily biodegradable at low concentrations which do occur in soil and sediment pore water.
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) and 30000 days for the toplayer of sediment. 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 ofamines, C36- alkylenedi-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).
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