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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

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Read-across approach

In the assessment of the environmental fate, ecotoxicity and toxicity of 2-ethylhexanoic acid, molybdenum salt (CAS: 34041-09-3), a read-across approach from data for the metal (molybdenum) and the organic anion (2-ethylhexanoate) is followed. This read-across strategy is based upon the observation that upon dissolution in aqueous media, 2-ethylhexanoic acid, molybdenum salt completely dissociates and only is present in its dissociated form, i.e., as molybdenum and 2-ethylhexanoate ions. Data on the environmental fate, ecotoxicity and toxicity for both transformation products (molybdenum and 2-ethylhexanoate) together can therefore be combined in an additive approach to predict the corresponding properties of 2-ethylhexanoic acid, molybdenum salt.

A detailed justification for the read-across approach is added as a separate document in section 13 of IUCLID.

Upon dissolution and dissociation of 2-ethylhexanoic acid, molybdenum salt into molybdenum and 2-ethylhexanoate, both ions will each show the proper (bio)degradation, bioaccumulation and partitioning behaviour in the environment, as reported for the corresponding ion. The environmental fate and behaviour for molybdenum and 2-ethyl hexanoate is predicted to be clearly different from each other, resulting in a different relative distribution over the environmental compartments (water, air, sediment and soil). Because the relative exposure to both constituent ions is hence predicted to be different from the original composition of 2-ethylhexanoic acid, molybdenum salt, data for the ecotoxicological properties of this substance tested as such are considered less relevant for its effects and risk assessment and a read-across approach from data for both the molybdenum and 2-ethyl hexanoate ions is preferred. The dose additivity approach is used to explain the ecotoxicological effects of 2-ethylhexanoic acid, molybdenum salt based on the data for the individual transformation products (molybdenum and 2-ethylhexanoate ions).