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Environmental fate & pathways

Biodegradation in soil

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Endpoint:
biodegradation in soil: simulation testing
Data waiving:
exposure considerations
Justification for data waiving:
the study does not need to be conducted because direct and indirect exposure of soil is unlikely
Endpoint:
biodegradation in soil, other
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Reference:
Composition 1
Qualifier:
no guideline followed
Principles of method if other than guideline:
No degradation experiment was performed with MDI in soil. Assumption based on chemical properties of MDI.
Test material information:
Composition 1
Details on transformation products:
No %Degr. indicated. Due to the fast reaction with moisture, MDI (structural similar to TODI) isomers and polymers are assumed to form inert, insoluble solid polyureas in soil. As MDI is structural similar to TODI, this can also be assumed for TODI.

No degradation experiment was performed with MDI in soil. It can nevertheless be assumed that MDI isomers and polymers will probably readily react with soil moisture to form polyureas.

Conclusions:
Biodegradation in soil of the supporting substance, methylenediphenyl diisocyanate, is not expected. This can also be assumed for TODI.
Executive summary:

Due to the fast reaction with moisture, MDI (methylenediphenyl diisocyanate; CAS no. 26447-40-5, EC no. 247-714-0, structural similar to TODI) isomers and polymers are assumed to form inert, insoluble solid polyureas in soil. As MDI is structural similar to TODI, this can also be assumed for TODI.

Description of key information

In accordance with column 2 of REACH 1907/2006/EC Annex IX, section 9.2.1.3, soil simulation testing does not need to be conducted as TODI has no high potential for adsorption to soil. In addition the direct and indirect exposure of soil is unlikely and TODI undergoes very fast hydrolysis under environmental conditions.



Key value for chemical safety assessment

Additional information

In addition, due to the fast reaction with moisture, MDI (methylenediphenyl diisocyanate; CAS no. 26447-40-5, EC no. 247-714-0, structural similar to TODI) isomers and polymers are assumed to form inert, insoluble solid polyureas in soil. As MDI is structural similar to TODI, this can also be assumed for TODI.