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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Description of key information

There are no simulation test data on biodegradation in water for the test substance.

It was assumed that this is a negligible removal mechanism.

Key value for chemical safety assessment

Additional information

The test substance is covered by the category approach of methylenediphenyl diisocyanates (MDI). Hence, data of the category substances can be used to cover this endpoint. The read-across category justification document is attached in IUCLID section 13. It is important to note that the MDI category approach for read-across of environmental and human hazards between the MDI substances belonging to the MDI category is work in progress under REACH. Therefore the read-across document should be considered a draft.

The test substances of the methylenediphenyl isocyanate (MDI) category react quickly with water and hence will be rapidly hydrolysed in contact with aqueous media (T1/2 = 20h). As a result, biodegradation of the hydrolysis products would be measured.