Registration Dossier
Registration Dossier
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EC number: 252-156-6 | CAS number: 34690-00-1
Biodegradation in soil
Administrative data
Link to relevant study record(s)
Description of key information
No study of biodegradation in soil is available for the registration substance. A reliable study of biodegradation in soil conducted with the parent acid form of the structurally analogous aminomethylenephosphonate substance HMDTMP is read-across. This study shows extensive degradation during the study in two soil types, indicating a conclusion that a significant degree of removal is possible in the wider environment. The half-life has not been quantified.
Key value for chemical safety assessment
- Half-life in soil:
- 10 d
- at the temperature of:
- 12 °C
Additional information
There are no data available for the registration substance, therefore data have been read-across from a structural analogue, HMDTMP-H.
HMDTMP-H (CAS 23605-74-5) has two aminobismethylphosphonate groups, connected by a hexyl chain. BHMT acid (CAS 34690-00-1) has three amine centres (five methylphosphonate groups), connected by hexyl chains.
As well as being structural analogues, both phosphonates have consistent chemical properties including high MW (492 and 685 respectively), very low log Kow(≤-4 for both substances) and are highly soluble in water. The substances generally posses similar physico-chemical properties and are not readily biodegradable.
Therefore, for the purpose of this assessment, read-across is considered valid.
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