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Surface tension

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Reference
Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2010
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
other: ISO 304 “Surface active agents – Determination of surface tension by drawing up liquid films”
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Deviations:
no
Principles of method if other than guideline:
Not applicable
GLP compliance:
not specified
Type of method:
other: According to Du Noûy method and Method DIN 53914
Key result
Surface tension:
ca. 28 mN/m
Temp.:
23 °C
Conc.:
0.2 g/L

The CMC was determined from the CMC curve by solving the two equations. The CMC for the test substance was determined to 2.3 mg/L at pH 7.0. The operating temperature was room temperature, in this case 23 °C. Also, the surface tension at 0.2 g/L solution has been determined to 28 mN/m. However, it should be noted that although the sample was not completely water soluble. Therefore, solid particles might have had an impact on the CMC value. Hence, it is important to realize that not all of the surfactant was present as monomers during the CMC determination.

Conclusions:
Under the study conditions, the surface tension of the test substance at 0.2 g/L was determined to be 28 mN/m.
Executive summary:

A study was conducted to determine the surface tension of the test substance, C12 -18 DAQ (99.6% active) according to the OECD guideline 115 and ISO standard 304 at pH 7. The surface tension at 0.2 g/L has been determined to be 28 mN/m. However, it should be noted that the sample was not completely water soluble. Under the study conditions, the surface tension of the test substance at 0.2 g/L was determined to be 28 mN/m (Ulama & Anderson, 2010).

Description of key information

The surface tension of the test substance was determined according to OECD Guideline 115 and ISO method 304 (Ulama & Anderson, 2010). 

Key value for chemical safety assessment

Surface tension:
28
in mN/m at 20°C and concentration in mg/L:
200

Additional information