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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Ecotoxicological information

Toxicity to microorganisms

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Administrative data

Link to relevant study record(s)

Description of key information

The 30-min EC50 value for cesium fluoro aluminate complex is >100 mg/L in activated sludge.

Key value for chemical safety assessment

EC50 for microorganisms:
100 mg/L

Additional information

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

A GLP-compliant 30 -min respiration inhibition test was performed according to OECD Guideline 209

In the first and duplicate measurement at 100 mg/L CsAlF-complex very slight inhibition (11 and 14%) in respiration rate of the sludge was recorded. This was on the borderline for significant inhibition. At the additional concentrations tested, 50 and 200 mg CsAlF-complex per litre, no significant inhibition in respiration rate of the sludge was recorded. Thus, the very slight inhibitory effect at 100 mg CsAlF-complex per litre on aerobic waste-water bacteria was not concentration related. Therefore, it is concluded that the 30 -min EC50 value is > 100 mg/L.