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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Administrative data

Endpoint:
distribution modelling
Type of information:
migrated information: read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: generally accepted calculation method

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2009

Materials and methods

Model:
calculation according to Mackay, Level I
Calculation programme:
Fugacity-Based Environmental Equilibrium Partitioning Model; Environmetal Modelling Centre; Trent University Peterborough, Ontario, Canada. Version 2.11 (1999).
Release year:
1 999
Media:
other: air-biota-sediment(s)-soil-water-aerosol

Test material

Constituent 1
Chemical structure
Reference substance name:
Adipic acid
EC Number:
204-673-3
EC Name:
Adipic acid
Cas Number:
124-04-9
Molecular formula:
C6H10O4
IUPAC Name:
adipic acid
Constituent 2
Reference substance name:
Hexanedioic acid
IUPAC Name:
Hexanedioic acid
Details on test material:
results related to pure substance
Based on the absence of data for disodium adipate, results from the corresponding acid are taken into account for this endpoint.

Results and discussion

Percent distribution in media

Air (%):
2.09
Water (%):
97.89
Soil (%):
0.01
Sediment (%):
0.01
Susp. sediment (%):
0
Biota (%):
0
Aerosol (%):
0

Any other information on results incl. tables

In the model adipic acid is treated as a type 1 chemical, i.e. the chemical partitions into all environmental media. Estimation is carried at an environmental temperature of 25 °C.

Applicant's summary and conclusion

Conclusions:
Based on the absence of data for disodium adipate, results from the corresponding acid, adipic acid are taken into account for this endpoint. Based on the results for adipic acid, it is conluded that also the main target compartment of disodium adipate is water.
Executive summary:

A read-across approach with adipic acid is applied. In aqueous media, disodium adipate and adipic acid acid dissociate into the corresponding anion (1,6-hexandioic acid ion) and the sodium ion and hydrogen ion (proton), respectively. Fate, behavior and the ecotoxicological properties of adipic acid and its disodium salt are thought to be an effect of the di-carboxylate ion rather than of the sodium ion or the hydrogen ion (proton), which are normal constituents in environmental systems and have no relevant ecotoxic properties in low concentrations.
Therefore a read-across between disodium adipate and adipic acid is justified.

The distribution of adipic acid in a "unit world" was calculated according to the Mackay fugacity model level I based on the physico-chemical properties. The main target compartment for adipic acid is water with 97.89%, followed by air with 2.09 %, and minor amounts for soil and sediment.