Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Administrative data

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:
no hazard identified

Marine water

Hazard assessment conclusion:
no hazard identified

STP

Hazard assessment conclusion:
no hazard identified

Sediment (freshwater)

Hazard assessment conclusion:
no hazard identified

Sediment (marine water)

Hazard assessment conclusion:
no hazard identified

Hazard for air

Air

Hazard assessment conclusion:
no hazard identified

Hazard for terrestrial organisms

Soil

Hazard assessment conclusion:
no hazard identified

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:
no potential for bioaccumulation

Additional information

Dimolybdenum carbide is non-toxic to daphnids, fish and algae at maximum water solubility. No relevant hazard is identified. The substance is not considered as hazardous for STP microorganisms. For the terrestrial environment, lack of any hazard is concluded based on the principles of the equilibrium partitioning method. This is supported by the no-observed-effect-concentration (NOEC) of ≥ 1000 mg/kg dry weight substrate in an earthworm short-term toxicity test (E. fetida, highest tested concentration). Available data from sodium molybdate dihydrate and sodium molybdate are appropriate to be used for the read-across approach. Due to lower water solubility of Mo2C compared to the read-across partners the resulting toxicity is also expected to be lower. Hence, the read across to the substances sodium molybdate dihydrate and sodium molybdate is sufficiently protective.

Conclusion on classification

Dimolybdenum carbide is non-toxic to daphnids, fish and algae at the maximum water solubility and the read across to the substances sodium molybdate dihydrate and sodium molybdate is sufficiently protective. No relevant hazard is identified. The aquatic toxicity data do not give rise for concern regarding adverse effects of the substance to the environment. Classification of dimolybdenum carbide as hazardous to the aquatic environment is therefore not considered to be required.