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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Description of key information

One reliable key study is available on the potassium salt of the registered reaction mass. The limit test shows no toxicity up to the highest concentration tested and therefore the EC50 for invertebrates is higher than 100 mg/L.

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Additional information

One reliable key study is available on daphnids (Daphnia magna) for the potassium salt of the registered reaction mass. The reaction mass IBAP and its potassium salt have high water solubility and their behavior in water and biological systems is dominated by their ionization. The main assumption is that the potassium cation is not significant in respect of the toxicological effect on aquatic organisms which are expected to be related to the IBAP. In experimental dilute aqueous conditions at environmental pH (5-9), the salt will be completely dissociated and will not behave differently to the parent acid, at identical concentration of the particular speciated form present.

The short term toxicity to aquatic invertebrates was studied in a static limit test according to OECD TG No. 202 and Test Method C.2 from Commission Regulation (EC) No. 440/2008. No immobilisation of Daphnids was recorded at the highest test concentration of 100 mg/L (based on nominal) after 48 hours of exposure and therefore the 48h EC50 was determined above 100 mg/L.

The results on effects are expressed in nominal concentration of test item because the analytical measurement based on phosphate show that it was stable among the study. For the purpose of risk assessment, PBT/vPvB assessment and classification and labeling, the concentration was not corrected for the target substance because the molecular weight of potassium was assessed to be negligible compared to the molecular weight of the other constituents of the reaction mass.