Registration Dossier

Physical & Chemical properties

Surface tension

Currently viewing:

Administrative data

Link to relevant study record(s)

Reference
Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
26MAY2010-26MAY2010
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study without detailed documentation
Qualifier:
according to
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
no
Qualifier:
according to
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Deviations:
no
GLP compliance:
no
Type of method:
ring method
Remarks:
though type of method not specifically mentioned, the type was deduced from the fact that the Harkins-Jordan correction was applied to the measured data
Key result
Surface tension:
29.9 mN/m
Temp.:
20 °C
Remarks on result:
other: This is the average surface tension value obtained on two aqueous solutions of concentrations 277 and 239 mg/L.

Study results:

Water calibration: temp.= 26 degrees C, density = 0.997 g/cm3

Surface tension of purified water

Value 1: 71.4 mN/m

Value 2: 71.4 mN/m

Value 3: 71.4 mN/m

Value 4: 71.4 mN/m

Value 5: 71.4 mN/m

Value 6: 71 .5 mN/m

Arithmetic mean value: 71.4 mN/m; standard deviation: 0.1 mN/m (theoretical value: 71,6 mN/m, resulting a correction factor of 1.0028)

First test solution: (conc. =277 mg/L), temp.= 22 degrees C, density = 0.997 g/cm3; age of solution = 54 min.

Surface tension of solution 1

Value 1: 30.5 mN/m

Value 2: 30.5 mN/m

Value 3: 30.1 mN/m

Value 4: 29.9 mN/m

Value 5: 29.2 mN/m

Value 6: 29.6 mN/m

Arithmetic mean value: 30.0 mN/m; standard deviation 0.5 mN/m

Second test solution: (conc.=239 mg/L), temp.= 22 degrees C, density = 0.997 g/cm3; age of solution = 61 min.

Surface tension of solution 2

Value 1: 30.5 mN/m

Value 2: 29.9 mN/m

Value 3: 29.6 mN/m

Value 4: 29.4 mN/m

Value 5: 29.6 mN/m

Value 6: 29.3 mN/m

Arithmetic mean value: 29.7 mN/m; standard deviation 0.4 mN/m.

By adjusting the temperature setting of the tensiometer, differences in the density of the liquid can be compensated automatically.

Arithmetic mean of two test solutions: 29.85 mN/m (+/- 0.21 mN/m)

Arithmetic mean value corrected by calibration factor determined via water calibration: 29.9 mN/m

Conclusions:
The surface tension of an aqueous test substance solution at ca. 250 mg/L and 20°C was found to be 29.9 mN/m, in accordance with EC A.5 and OECD 115 guidelines. Because the surface tension is < 60 mN/m, the substance is regarded to be surface active, following EC A.5 guideline.

Description of key information

The surface tension of an aqueous test substance solution at ca. 250 mg/L was found to be 29.9 mN/m at 20°C. Because the surface tension is < 60 mN/m, the substance is regarded to be surface active.

Key value for chemical safety assessment

Surface tension:
29.9
in mN/m at 20°C and concentration in mg/L:
250

Additional information

Determined in a study performed in accordance with OECD 115, using the ring method.