Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Diss Factsheets

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Adsorption / desorption

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.

Henry's Law constant

The Henry's Law constants were estimated using the software HENRYWIN (v3.20).

The HLCs of methylbicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid (METHAc) in its identified isomeric forms, as hydrolysis products of 1,2,3,6-tetrahydromethyl-3,6-methanophthalic anhydride, were considered for the environmental assessment.

The value of 5.6E-07 Pa m³/mol, as a mean of estimated values, indicates that METHAc is essentially non volatile from surface water.

Distribution modelling

Distribution in environmental compartments has been calculated using a Fugacity model, under the emission scenario of 1000 kg/h into each of air, water and soil compartments, according to Mackay, Level III.

The distribution of 5-methylbicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid (5-METHAc) was estimated as: Air= 0.0%; Water= 34.6%; Soil= 65.4% and Sediment= 0.06%.

The distribution of 1-methylbicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid (4-METHAc) was estimated as: Air= 0.0%; Water= 34.5%; Soil= 65.5% and Sediment= 0.06%.

The soil, and less water, were then found to be the major target compartments.