Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Concerning the fate and behaviour of the multi constituent substance “dicarboxylic acids” in the environment, adipic acid is applied for read-across approach. Adipic acid is one of the constituents of the dicarboxylic acid mixture. All constituents are homologues linear alkyl dicarboxylic acids with a chain length of four to six carbon atoms. The mixture is composed of three discrete carboxylic acids. Due to the structural relationship, adipic acid is a good representative for the dicarboxylic acid mixture. Adipic acid is well assessed on behalf of the ICCA/OECD HPV-program, and adequate information already exits to satisfy the requirements under REACH for each endpoint. Where no data are available for the dicarboxylic acid mixture, data gaps were filled using the data of adipic acid.

Stability

A read-across approach is applied. In the atmosphere a half-life of 2.9 days for adipic acid is estimated due to indirect photolysis with hydroxyl radicals.

With regard to the chemical structure of each constituent hydrolysis is not expected under environmental conditions.

Biodegradation

Carboxylic acids, di-, C4 -6 is readily and inherently biodegradable.

Bioaccumulation

The calculated BCF value indicates that carboxylic acids, di-, C4 -6

have no potential on bioaccumulation in aquatic organisms.

Adsorption / desorption

A read-across approach is applied.

Based on calculations the adsorption coefficient for adipic acid ranged from 2.4 to 21.5, indicating a low adsorption potential.

Henry's Law constant

A read-across approach is applied.

The calculated Henry's law constant of 0.0616 Pa*m³/mol indicates that adipic acid has a low potential for volatilization from surface waters.