Registration Dossier

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Ecotoxicological information

Endpoint summary

Administrative data

Description of key information

A reliable toxicity study in invertebrates has been conducted for ortho-phthalaldehyde and ais included in the dossier. Further information on algae and fish is available.

Daphnia magna was observed to be the most sensitive species. The related 48-h EC50 determined according to EU method C.2 (acute toxicity for Daphnia magna) was 0.11 mg/L.

Additional information

Data on the freshwater algae Pseudokirchneriella subcapitata as presented on the EPA database (ECOTOX knowlegdebase) is added to the dossier as supplementary information. The reported 96-h EC50 is 184 µg/L, indicating that D. magna is slightly more sensitive than algae.

Regarding toxicity towards microorganisms the following effect concentrations were determined within a test conducted according to the OECD guideline 209:

Total respiration

NOEC = 9.8 mg/L

EC50 = 76.6 mg/L (95 % CI: 48.9 - 143.2 mg/L)

Heterotrophic respiration

NOEC = 3.1 mg/L

EC50 = 33.0 mg/L (95 CI: 24.2 - 48.2 mg/L)

Nitrification

NOEC = 31.3 mg/L

EC50 > 100 mg/L