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Physical & Chemical properties

Surface tension

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Reference
Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
equivalent or similar to guideline
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
no
GLP compliance:
not specified
Type of method:
ring method
Specific details on test material used for the study:
Batch no.: 145
Appearance: white granular powder
Key result
Surface tension:
ca. 41 mN/m
Temp.:
20 °C
Conc.:
1 g/L
Remarks on result:
other: arithmetic mean corrected by calibration factor determined via water calibration

Table 1. Water calibration: temp. = 20°C, p = 0.998 g/cm³

 Surface tension of purified water
 Value 1  71.5 mN/m
 Value 2  71.8 mN/m
 Value 3  71.7 mN/m
 Value 4  71.7 mN/m   
 Value 5  71.7 mN/m
 Value 6  71.6 mN/m
Arithmetic mean  71.7 mN/m
 Standard deviation  0.1 mN/m

Arithmetic mean 71.7 mN/m, standard deviation 0.1 mN/m from 6 measurements (theoretical value: 72.6 mN/m -> correction factor 1.0126)

Table 2. First test solution (c=1.045 g/L), temp. = 20°C, p=0.998 g/cm³, age of the solution = 91 min

    Surface tension of the solution
 Value 1  40.7 mN/m
 Value 2  40.7 mN/m
 Value 3  40.5 mN/m
 Value 4  40.6 mN/m   
 Value 5  40.6 mN/m
 Value 6  40.6 mN/m
Arithmetic mean  40.6 mN/m
 Standard deviation  0.3 mN/m

Arithmetic mean 40.6 mN/m, standard deviation 0.3 mN/m from 6 measurements

Table 3. Second test solution (c=1.059 g/L), temp. = 20°C, p = 0.998g/cm³, age of the solution= 272 min

Surface tension of the solution
 Value 1  40.5 mN/m
 Value 2  40.4 mN/m
 Value 3  40.3 mN/m
 Value 4  40.3 mN/m   
 Value 5  40.4 mN/m
 Value 6  40.3 mN/m
Arithmetic mean  40.4 mN/m
 Standard deviation  0.1 mN/m

Arithmetic mean 40.4 mN/m, standard deviation 0.1 mN/m from 6 measurements.

Conclusions:
Under the study conditions, the surface tension of the substance was determined to be 41.0 mN/m at concentration of 1 g/L.
Executive summary:

A study was conducted to determine the surface tension of the substance according to a method similar to OECD Guideline 115 and EU Method A.5. The test substance was dissolved into water (1 g/L), conditioned for 10 min in an ultrasonic bath and tempered at 20°C. The automatic measurement was then initiated. The practical test performance was based on the in-house test procedure 34N10001.01: "Determination of Surface Tension of aqueous solutions". Two different solutions with a concentration of 1 g/L were prepared. The surface tension should be measured, if the solution was in equilibrium state. The solution in the measuring vessel was approximately in equilibrium, if the measured surface tension was nearly constant. An average of 6 single measurements was determined per solution. In this case, the total measuring time was more than 1200 s per solution. Both solutions were in an equilibrium state after approx. 4000 and 5500 s. Under the study conditions, the surface tension of the substance was determined to be 41.0 mN/m at concentration of 1 g/L (Kintrup, 2016).

Description of key information

The surface tension was determined according to a method similar to OECD Guideline 115 and EU Method A.5 (Kintrup, 2016)

Key value for chemical safety assessment

Surface tension:
41
in mN/m at 20°C and concentration in mg/L:
1 000

Additional information