Registration Dossier

Environmental fate & pathways

Adsorption / desorption

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

Adsorption coefficient (Koc): 0.0137 L/Kg as hexahydrophthalic acid
Adsorption coefficient (Koc): 190 L/Kg as hexahydrophthalic anhydride

Key value for chemical safety assessment

Koc at 20 °C:
0.014

Additional information

The adsorption coefficient (Koc) of hexahydrophthalic acid (HHPAc) was estimated, from KOCWIN using the LogKow (logD) method, to have a log10Koc value of -1.863 (equivalent Koc= 0.0137).

According to the McCall classification scheme of soil mobility potential, the substance would be regarded as very highly mobile (0 < Koc < 50) on soil.

The adsorption coefficient (Koc) of hexahydrophthalic anhydride (HHPA) was determined, using the HPLC method in accordance with OECD/EU test guidelines, to have a log10Kocvalue of 2.3 (equivalent Koc= 190). According to the McCall classification scheme of soil mobility potential, the substance would be regarded as having medium mobility in soil.

Because hexahydrophthalic anhydride is hydrolysed practically instantaneously to its acid form (HHPAc), then for the environmental and PBT assessments the above substance was considered more significant, with Koc= 0.0137.