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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

EC0 200 mg/l activated sludge respiration inhibition (non-standard test, rel. 2) Henkel 1972. The key data are read across from the parent acid ATMP.

Key value for chemical safety assessment

Additional information

A number of non-standard studies are available giving evidence that ATMP acid has no inhibitory effect on micro-organisms at concentrations up to ca. 200 mg/L.

A study of seven Swiss WWTPs in 1996 shows a maximum concentration of ATMP acid in WWTP untreated influent of ca. 0.8 umol/L, equivalent to ca. 0.26 mg/L.

This substance is a member of a category of various ionised forms of the acid ATMP (CAS 6419-19-8). The main assumption is that potassium is not significant in respect of all the properties under consideration (and would not influence effects on micro-organisms). 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.