Registration Dossier
Registration Dossier
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EC number: 232-227-8 | CAS number: 7790-86-5
Toxicity to terrestrial plants
Administrative data
Link to relevant study record(s)
Description of key information
No key data were identified for toxicity of cerium to terrestrial plants. However, further testing is not considered necessary since the current CSA, performed using a PNECsoil derived based on the equilibrium partitioning method, does not indicate the need for refinement of the terrestrial hazard assessment.
Key value for chemical safety assessment
Additional information
A single reliable study was identified for toxicity of cerium to terrestrial plants (Hu et al., 2002). In this study, the effects of cerium (provided as cerium trichloride) on wheat growth (Triticum aestivum) were investigated in a nutrient solution experiment. In the 7-d experiment, a NOEC of 0.5 mg Ce/L was obtained for primary root elongation as well as root and shoot dry weight. In the 16-d experiment, a NOEC of 0.5 mg Ce/L was obtained for primary root elongation whereas the NOEC for root and shoot dry weight was < 0.5 mg Ce/L. The results of this study were considered reliable with restrictions since no analytical verification of cerium concentrations was performed during the study. However, because the test was semi-static and at relatively low pH (5.5), precipitation of cerium may have been negligible.
To get an idea of the levels of cerium in soil that would not cause any significant adverse effects on plants, the log Kp determined for soil in this dossier can be used for recalculation. A NOEC of 0.5 mg Ce/L then corresponds to a NOEC of 1733 mg Ce/kg soil dw.
A study performed in nutrient solution is not sufficient for covering this endpoint as not representative of the ‘real’ terrestrial environment. Nevertheless, further testing is not considered necessary since the current CSA, performed using a PNECsoil derived based on the equilibrium partitioning method, does not indicate the need for refinement of the terrestrial hazard assessment.
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