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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Adsorption / desorption

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Administrative data

Link to relevant study record(s)

Description of key information

The adsorption to soil was estimated for the three main constituents of the target substance by using the Estimation Programs Interface Suite™ for Microsoft® Windows, v 4.10. United States Environmental Protection Agency, Washington, DC, USA. The adsorption to soil was separately calculated with KocMin v.2.00 for acetic anhydride, acetic acid and adipic acid. The MCI method resulted a Koc values ranging from 12 to 24.35 L/kg for these three main constituents. The log Kow based method resulted a Koc ranging from 1.153 to 1.585 L/kg for the same constituents. The highest estimated adsorption coefficient value by using the MCI method for one of the main constituent of the target substance (Acetic anhydride) was selected as a key value for CSA.

Key value for chemical safety assessment

Koc at 20 °C:
24.35

Additional information

The target substance is an UVCB substance consisting of adipic acid, di-anhydride with bis(acetic acid) (ca. 57 %), Acetic acid (ca.32.5 %), acetic anhydride (ca. 7.1 %), adipic anhydride (ca. 1.5 %) and oligomeric adipic anhydrides (ca. 1.0 %). The target substance is unstable in water and decomposes immediately in contact with water to form adipic acid and acetic acid. There are no studies available from the substance itself.

The estimated Koc-values were calculated with KOWWIN v.2.00 estimation tool (US EPA 2014). The highest estimated adsorption coefficient values (Koc 24.35 at 20 °C and log Koc 1.585 at 20 °C) by using the MCI method for one of the main constituent of the target substance (adipic anhydride) was selected as a key value for CSA.

[LogKoc: 1.585]