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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Description of key information

There are no data for the registration substance, ATMP-xNa. A 48 h EC50 value of 297 mg/L has however been determined for the effects of ATMP-H on mobility of the freshwater flea Daphnia magna.

A 48 h LC50 value of 94 mg/L has similarly been determined for the effects of ATMP-H on mortality of the marine invertebrate Acartia tonsa.

Key value for chemical safety assessment

EC50/LC50 for freshwater invertebrates:
297 mg/L
EC50/LC50 for marine water invertebrates:
94 mg/L

Additional information

Freshwater

Reliable data on the short term toxicity of ATMP-xNa salts, CAS 20592-85-2, to freshwater invertebrates are not available. However, a reliable 48 h EC50 value of 297 mg active acid/L has been determined for the effects of ATMP-H (CAS 6419-19-8) on mobility of the freshwater flea Daphnia magna.

The results of tests conducted on ATMP and its salts are directly comparable, because the ionisation state will depend only on the pH of the test medium. The counterion is not considered to contribute to effects in fish. At environmentally-relevant pH values, ATMP will be ionised typically four or five times, and will form stable complexes with metal ions.

Here, the value of 297 mg equivalent active acid/L may be directly read-across.

 

Marine

Reliable data on the short term toxicity of ATMP-xNa salts, 20592-85-2, to marine invertebrates are not available. However, a reliable 48 h LC50 value of 94 mg active acid/L has been determined for the effects of ATMP-H (CAS 6419-19-8) on mobility of the marine invertebrate Acartia tonsa.

The results of tests conducted on ATMP and its salts are directly comparable, because the ionisation state will depend only on the pH of the test medium. The counterion is not considered to contribute to effects in fish. At environmentally-relevant pH values, ATMP will be ionised typically four or five times, and will form stable complexes with metal ions.

Here, the value of 94 mg equivalent active acid/L may be directly read-across.

The results have been read-across to ATMP sodium, potassium and ammonium salts in accordance with the rationale outlined in the Ecotoxicological information section of the IUCLID and Section 1.4 of the CSR