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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:
From 19 December 2018 to 22 February 2019
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reason / purpose:
reference to same study
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:
no
Remarks:
The study was conducted in a facility which operates in accordance with Good Laboratory Practice principles; however no claim of GLP compliance was intended nor is made for this study
Type of method:
ring method
Key result
Surface tension:
ca. 32.3 mN/m
Temp.:
20 °C
Conc.:
2 040 mg/L
Remarks on result:
other: Test substance concentration of 90% of the CMC (2.04 x 10^3 mg/L)

Results

The readings and temperatures for the sample solutions are shown in the following table:

Table1: Surface tension values

Concentration (mg/L)

Reading (mN/m)

Temperature (°C)

3.037 x103

36.0

20.0

31.5

20.0

31.5

20.0

31.0

20.0

1.012 x 103

37.0

20.2

33.0

20.2

32.5

20.2

32.5

20.2

303.7

46.5

20.2

44.0

20.2

44.0

20.2

43.5

20.2

101.2

53.5

20.2

50.5

20.2

50.5

20.2

50.0

20.2

30.37

59.0

20.4

57.0

20.4

57.0

20.4

57.0

20.4

10.12

65.5

20.4

64.5

20.4

64.5

20.4

64.0

20.4

3.037

70.0

20.4

69.0

20.4

69.0

20.4

68.5

20.4

1.012

70.5

20.4

70.5

20.4

70.5

20.4

0.3037

72.5

20.4

72.5

20.4

72.5

20.4

0.1012

72.5

20.4

72.5

20.4

72.5

20.4

Mean surface tension values were based on the last three readings for a particular concentration which were considered to be constant.

Theconcentration (mg/L), log10[concentration (mg/L)] and mean surface tension values for the sample solutions are shown in the following table:

 

Table2:Theconcentration (mg/L), log10[concentration (mg/L)] and mean surface tension values

Concentration
(
mg/L)

Log10Concentration

Mean Surface Tension (mN/m)

Solution pH

3.037 x 103

3.482

31.3

6.3

1.012 x 103

3.005

32.7

6.4

303.7

2.482

43.8

6.2

101.2

2.005

50.3

6.6

30.37

1.482

57.0

n/a

10.12

1.005

64.3

5.9

3.037

0.482

68.8

6.1

1.012

0.005

70.5

6.0

0.3037

-0.518

72.5

6.1

0.1012

0.995

72.5

6.1

The surface tension at a concentration of 90% of the CMC (2.04 x 103 mg/L) was calculated to be 32.3 mN/m using the equation for Line 1.

Conclusions:
Under the study conditions, the surface tension at a test substance concentration of 90% of the CMC (2.04 x 103 mg/L) in water was determined to be 32.3 ± 0.5 mN/m at 20 ± 0.5ºC; therefore it is surface-active.
Executive summary:

A study was conducted to determine the surface tension of the test substance, using ring method, according to the OECD Guideline 115 and EU Method A.5. Under the study conditions, the surface tension at a test substance concentration of 90% of the CMC (2.04 x 103 mg/L) in water was determined to be 32.3 ± 0.5 mN/m at 20 ± 0.5ºC; therefore it is surface-active (Envigo, 2019).

Description of key information

The surface tension of the test substance was determined using the ring method, according to OECD Guideline 115 and EU Method A.5 (Envigo, 2019).

Key value for chemical safety assessment

Surface tension:
32.3
in mN/m at 20°C and concentration in mg/L:
20

Additional information

(surface active)