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Environmental fate & pathways

Adsorption / desorption

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Description of key information

The EU-REACH information requirements related to the soil organic carbon partition coefficient (Koc) are derogated due to technical inability to measure them. However, estimates of these properties are provided (Table 25 in the Category Justification Document). For the constituents having molecular weight up to approximately 2,500 g/mol, the estimated log Koc values range from 4.5 (for the mMDI substances) to 18.0, indicating a strong affinity of the constituents, and hence the MDI substances, to soil if only an equilibrium partitioning mechanism were involved. A log Koc value of 4.5 is considered for the derivation of the PNECsediment and PNECsoil.

Key value for chemical safety assessment

Other adsorption coefficients

Type:
other: log Koc
Value in L/kg:
4.5

Additional information

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