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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

The registered substance, the Amines, C16-18 (even numbered)-alkyl , salts with phosphoric acid, mono- and di-C16-18 (even numbered) alkyl esters is considered as not readily biodegradable.

Therefore, a new study on the Alkyl phosphate and stearyl amine salts (EC = 952-252-4) will be performed according the TG OECD 301/310 and under GLP to verify the biodegradability potential of the salt.

Key value for chemical safety assessment

Biodegradation in water:
not biodegradable
Type of water:
freshwater

Additional information

Alkyl phosphate and stearyl amine salts (EC = 952-252-4) are mainly composed by primary alkylamines (CAS 90640-32-7, UVCB), Monoalkyl dihydrogenophosphate and Dialkyl hydrogenophosphate salts (CAS 39471-52-8, Multi-Constituent). This different chemical structures are constituted by variable chain lenght with C16 and C18.

 

Based on the available GLP studies on biodegradation, primary alkylamine are estimated to be readily biodegradable. A key study on hydrogenated tallow alkylamine relates 75 % of biodegradation after 28 days according an OECD 301D protocol (new CAS 90640 -32 -7 ; CAS 61788 -33 -8) Considering that the test item is an organic uvcb, the 10 window criteria do not apply.

 

Phosphoric acid, octadecyl ester (CAS 39471-52-8) is not readily biodegrable according an OECD 301 B (28% in 28 days) under GLP.

 

Biodegradation property of the registered substance is based on a weight of evidence approach where the most conservative and reliable values found for each constituant of the Alkyl phosphate and stearyl amine salts (EC = 952-252-4) is considered. Therefore the registered substance is considered as not readily biodegradable.

 

It is of importance to note that a new study on the Alkyl phosphate and stearyl amine salts (EC = 952-252-4) will be performed according the TG OECD 301/310 to verify the biodegradability potential of the salt.