Registration Dossier
Registration Dossier
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EC number: 246-644-8 | CAS number: 25134-21-8
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.
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