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Physical & Chemical properties

Surface tension

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Reference
Endpoint:
surface tension
Type of information:
read-across based on grouping of substances (category approach)
Adequacy of study:
key study
Study period:
From 24 April, 2008 to 25 April, 2008
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
KL2 due to RA
Justification for type of information:
Refer to the Quaternary ammonium salts (QAS) category or section 13 for details on the category justification. The study with the read across substance is considered sufficient to fulfil the information requirements as further explained in the provided endpoint summary
Qualifier:
according to
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
ring method
Key result
Surface tension:
24.04 mN/m
Temp.:
20 °C
Conc.:
1 g/L
Remarks on result:
other: Standard deviation: 0.05%

Surface tension of the test substance at different concentrations:

Concentration (g/L)

Surface tension (mN/m)

Mean temperature (⁰C)

0.05

45.52

19.9

0.20

31.81

20

0.35

30.29

19.9

0.50

24.60

20

0.75

24.13

20

1

24.04

20

5

31.88

19.7

10

33.98

19.9

Conclusions:
Based on the results of the read across study, the the surface tension and the CMC of the test substance, C12-14 TMAC also can be considered to be 24.04 +/- 0.05 mN/m and 1 g/L respectively.
Executive summary:

A study was conducted to determine the surface tension and critical micelle concentration of the test substance, Coco TMAC, according to OECD 115 and EU A.5 Guidelines, in compliance with GLP. 1 g/L (total volume 200 mL), prepared in HPLC water, was used to determine the surface tension in 10 measurements with a tensiometer. Different concentrations of the test substance in the range of 0.05 to 10 g/L (total volume 200 mL), prepared in HPLC water, were applied for the determination of critical micelle concentration at a temperature of 20°C. Under the test conditions, the surface tension and the CMC of the test substance were determined to be 24.04 +/- 0.05 mN/m and 1 g/L respectively (Bodsch, 2008). Based on the results of the read across study, the the surface tension and the CMC of the test substance, C12-14 TMAC also can be considered to be 24.04 +/- 0.05 mN/m and 1 g/L respectively.

Description of key information

Surface tension and CMC of the read across substance, Coco TMAC, was determined according to OECD 115 and EU A.5 Guidelines (Bodsch, 2008).

Key value for chemical safety assessment

Surface tension:
24.04
in mN/m at 20°C and concentration in mg/L:
1 000

Additional information

CMC: 1 g/L