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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Physical & Chemical properties

Additional physico-chemical information

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Administrative data

other: critical micelle concentration
Type of information:
experimental study
Adequacy of study:
supporting study
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Study in accordance with generally accepted scientific standards and described in sufficient detail Adopted according to OECD SIDS or other official EU regulation procedures (public available peer reviewed source).

Data source

Reference Type:
Structure Changes in Sodium Dodecyl Sulfate Micelles Induced by Using Counterion Complexation by Macrocyclic Ligands.
Evans DF et al.
Bibliographic source:
J. Chem. Phys. 90, 5500-5502

Materials and methods

Principles of method if other than guideline:
Experiments with ligands which form complexes with sodium
showed, that the micellization of SDS is dependent on
counter-ion specific effects. The CMC, aggregation number
and the ionization of the micelles was altered considerably.

Results and discussion

Without ligand, a CMC value of 8 mmol/l at 25 degrees C and an aggregation number of 64 was determined.

Applicant's summary and conclusion