Registration Dossier

Environmental fate & pathways

Bioaccumulation: aquatic / sediment

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Administrative data

Link to relevant study record(s)

Description of key information

Based on the measured BCF, ATMP and its salts are not expected to bioaccumulate.

Key value for chemical safety assessment

BCF (aquatic species):
22 L/kg ww

Additional information

There is a report of bioaccumulation of ATMP in carp, bioconcentration factor in the exposure phase of –<4 - 22 (EG&G, 1976). A secondary source reports results of a separate test as BCF = 5.2 – 17.7 measured for ATMP acid in Brachydanio rerio (zebra fish) (Steber and Wierich). A third study reporting consistent results, previously reported in the public domain via the SIDS dossier, is not traceable.

The key result is read across to this substance.

This substance is a member of a category of various ionised forms of the acid 6419-19-8. The main assumption is that sodium is not significant in respect of all the properties under consideration. In dilute aqueous conditions of defined pH a salt will behave no differently to the parent acid, at identical concentration of the particular speciated form present and will be fully dissociated. Hence some properties (measured or expressed in aqueous media, e.g. ecotoxicity) for a salt can be directly read across (with suitable mass correction) to the parent acid and vice versa. In the present context the effect of the counter-ion (sodium) will not be significant. In biological systems and the environment, polyvalent metal ions will be present, and the phosphonate ions show very strong affinity to them.