Registration Dossier
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EC number: 235-115-7 | CAS number: 12069-89-5
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
In an interlaboratory exchange program between the Laboratory of Environmental Toxicology at Ghent University (UGent, Belgium) and the Chilean Mining and Metallurgy Research Center (CIMM, Santiago, Chile), sodium molybdate dihydrate was checked for its inhibitory effects against algae (P. subspicatus). The geometric mean of the 72h-ErC10 values for the tested strain CIMM was 74.3 mg Mo/L.
Key value for chemical safety assessment
- EC10 or NOEC for freshwater algae:
- 74.3 mg/L
Additional information
In an interlaboratory exchange program between the Laboratory of Environmental Toxicology at Ghent University (UGent, Belgium) and the Chilean Mining and Metallurgy Research Center (CIMM, Santiago, Chile), sodium molybdate dihydrate was checked for its inhibitory effects against algae (P. subspicatus). The geometric mean of the 72h-ErC10 values for the tested strain CIMM was found to be 74.3 mg Mo/L. Available data from sodium molybdate dihydrate are appropriate to be used for the read-across approach. Due to the lower water solubility of dimolybdenum carbide compared to sodium molybdate dihydrate the resulting toxicity is also expected to be lower. Hence, the read-across to the substance sodium molybdate dihydrate is sufficiently protective.
Due to some deficiencies in study performance and reporting, two further studies were assigned to a Klimisch 3 reliability status which means that these K3 data on its own are not useful within a regulatory context. However, the information in these two publications might still have their scientific merit. In the two algal growth inhibition tests, sodium molybdate and sodium molybdate dihydrate was inhibitory to algae. Selenastrum capricornutum was more sensitive than Scenedesmus supspicatus. The NOEC in the more sensitive test was found to be 4.6 mg/L and the EC50 (growth rate, 72 h) was > 100 mg/L.Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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