Registration Dossier

Physical & Chemical properties

Additional physico-chemical information

Administrative data

Endpoint:
additional physico-chemical information
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:
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
Endpoint investigated:
other: Critcal Micelle Concentration

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).