Registration Dossier
Registration Dossier
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EC number: 943-366-5 | CAS number: -
Endpoint summary
Administrative data
Description of key information
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 %).
Acetic anhydride is unstable in water and decomposes immediately (half-life about 4 minutes) in contact with water to acetic acid/acetate. Adipic anhydrides hydrolyse also rapidly when in contact with water to adipic acid and acetic acid.
Acetic acid and adipic acid are not expected to hydrolyse since the compounds lack functional groups that hydrolyze under environmental conditions. All of the constituents of the target substance are not classified hazardous for the environment. The main effect for the environment from the target substance is the lowering of pH after hydrolysis of the acetic anhydride and formation of acetic acid.
Biodegradation, water solubility and partition coefficients (Kow), were determined for the individual constituents i.e. acetic anhydride, acetic acid and adipic acid. Based on the literature information from water and soil screening tests all of these main constituents are regarded as readily biodegradable in water and soil.
Transport and distribution
Log Koc values from the three main constituents are 1.153-1.585 (based on the log kow values). Therefore the target substance is expected to have high mobility in environment. Acetic anhydride has some potential for volatilization from soil based on the vapor pressure of the substance. Volatilization of acetic acid from moist soil surfaces is not expected based on the Henry's law, but vapour pressure indicates that volatilization may occur from dry soil surfaces. For adipic acid, volatilisations from dry or moist soil are not expected based on the Henry's law and vapour pressure of the substance.
Acetic acid is expected to volatilize from water surface based on Henry’s law. Adipic acid is non-volatile from water surfaces and volatilization for acetic anhydride is expected to be low.
Bioaccumulation
The bioconcentration factors for all three constituents is 3.16 L/kg and the log Kow values for the three constituents are between -0.17 -0.577. The bioconcentration factors and bioaccumulation factors were calculated by using the BCFBAF v3.01 estimation tool (US EPA 2016) and the log Kow values were taken from the literature. Based on the bioconcentration, log Kow values and the biodegradation of the constituents of the target substance, the target substance is not expected to be bioaccumulative.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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