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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Environmental fate & pathways


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Administrative data

Link to relevant study record(s)

Description of key information

No data are put forward as this endpoint is not relevant for molybdenum, and metals in general.

Key value for chemical safety assessment

Additional information

In the case of the current substance, the chemical safety assessment will be based on elemental metal concentration, i.e., the assessment of molybdenum is conducted regardless of the (pH-dependent) speciation in the environment. Hence, as the assessment is based on the element concentration (i.e., Mo as molybdate), physicochemical processes like decomposition and degradation by reaction with water are not relevant. Formation of different Mo-forms may occur at specific pH-levels, but the chemical assessment will not make any differentiation among the different Mo-species (pooling of different speciation forms). This elemental-based assessment (pooling together of all speciation forms) can be considered as a worst-case assumption for the chemical assessment.

In general, (abiotic) degradation is an irrelevant process for inorganic substances that are assessed on an elemental basis.