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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Description of key information

A 48-hour EC50 value of 66 mg/L and NOEC of 18 mg/L have been determined for the effects of the test substance on mobility of Daphnia magna.

Key value for chemical safety assessment

Additional information

The available test data for the substance do not provide an adequate basis for determining a hazard classification for the substance or a PNEC.

ATMP-xNH4 will dissociate when it is released into aqueous environments to yield ATMP and ammonia.The assessment of short-term toxicity of the substance to aquatic organisms and the resulting hazard classification are therefore, in the absence of an adequate set of test data, based on treating the substance as a preparation. Test data do not indicate that ATMP acid is toxic to fish following short-term exposure. The un-ionised ammonia moiety is however known to be toxic to aquatic organisms and concentration limits, as stipulated in the Annex I (DSD)/Annex VI (CLP) entry for ammonia, will be applied in order to derive a hazard classification forATMP-xNH4.

ATMP and ammonia will also be treated separately for the purposes of deriving PNECs for the aquatic compartment. A PNECaquatic for ammonia has already been derived by the UK Environment Agency for the purpose of setting an Environmental Quality Standard (EQS) under Annex VIII of the Water Framework Directive (WFD). The relevant data are presented in section 7.6 of the CSR. This PNEC is also considered to be adequate for the purpose of risk characterisation of ammonia present in ATMP-xNH4. A PNEC for ATMP will be determined using test data for the substance.