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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Koc constants:
- 1,2,3,6-tetrahydromethyl-3,6-methanophthalic anhydride (METH): Koc,n=25.52 L/Kg
- methylbicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid (METHAc): Koc,i= 0.017 L/Kg

Key value for chemical safety assessment

Koc at 20 °C:
25.5

Additional information

The adsorption coefficients on soil of the registered substance (Koc,n: METH) and the corresponding acid (Koc,i: METHAc) were calculated according to the EPA model KOCWIN (v2.00).

It was verified, using the Log Kow method, that Koc,i < Koc,n.

According to the McCall classification scheme, both the anhydride and acid forms are very highly mobile (0 < Koc < 50) on soil.

The higher value of the anhydride form, Koc= 25.5 L/Kg, was selected with conservative approach for the environmental assessment.