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Short-term toxicity to aquatic invertebrates

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Description of key information

The 48-h EC50 value for cesium fluoro aluminate complex in water fleas (Daphnia magna) was found to be 31 mg/L.

Key value for chemical safety assessment

Fresh water invertebrates

Fresh water invertebrates
Effect concentration:
31 mg/L

Additional information

No short-term toxicity test with aquatic invertebrates is available for cesium tetrafluoroaluminate. The results from the structural analogue cesium fluoro aluminate complex are used instead (for details see Reporting Format as atttached to the respective IUCLID entry and CSR Appendix B.2).

A GLP compliant OECD 202 guideline study with Daphnia magna is available for cesium fluoro aluminate complex. Daphnids were exposed to nominal concentrations of 5.6, 10, 18, 32, 56 and 100 mg/L under static conditions for 48 hours. The 5.6, 18 and 100 mg/L test concentrations were analytically verified by measuring the Aluminium content. At the end of the 48 -hour period the measured Aluminium concentration had decreased by more than 20% in all samples. Therefore the biological effect concentrations are based on average exposure concentrations (geometric means). The 48h NOEC based on immobility and measured concentrations was equal to 22 mg cesium fluoro aluminate complex per Litre. The 48 EC50 based on immobility and measured concentrations was equal to 31 mg cesium fluoro aluminate complex per Litre with 95% confidence limits of 29 - 35 mg/L.