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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Administrative data

Endpoint:
other: Critcal Micelle Concentration
Type of information:
experimental study
Adequacy of study:
key study
Study period:
24 December 2015 to 22 March 2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: study under GLP

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2016

Materials and methods

Test guideline
Qualifier:
equivalent or similar to guideline
Guideline:
other: ISO 4311: Anionic and non-ionic surface active agents — Determination of the critical micellization concentration — Method by measuring surface tension with a plate, stirrup or ring
GLP compliance:
yes

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
semi-solid (amorphous): gel
Remarks:
paste
Details on test material:
Identification DDBSA/DIOPA
Appearance Off-white to light yellow paste

Results and discussion

Results:
CMC was determined from the plot of the surface tension of the test solutions as function of log C based on the interception of 2 trendlines from the test solutions with nominal test item concentrations of 10.3, 35.0 and 100.0 mg/L and from the test solutions with nominal test item concentrations of 1005.0, 3007.0 and 10006.7 mg/L (mean values).

The intersection was calculated to be log C = 2.71. It corresponded with a CMC of 510 mg/L.

Any other information on results incl. tables

Measurement

at 20°C±0.5°C

Time passed [minutes]

Mean Surface Tension
[mN/m]

1 mg/L

15-19

72.9 (Φb=1.02)

10 mg/L

15-19

72.4 (Φb=1.02)

35 mg/L

18-22

66.4 (Φb=1.00)

100 mg/L

15-19

49.4 (Φb=1.02)

1000 mg/L

15-19

36.7 (Φb=1.02)

3000 mg/L

17-21

35.3 (Φb=1.00)

10000 mg/L

16-20

34.5 (Φb=1.02)

Applicant's summary and conclusion

Conclusions:
The critical micelle concentration of the substance is 520 mg/L
Executive summary:

The CMC was determined by measuring the surface tension of test substance solutions at different concentrations. No further decrease of surface tension was measured at 520 mg/L (extrapolated value).