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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
Study period:
From November 06, 2017 to February 01, 2018
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Remarks:
non-GLP and not determined for 90% saturated solution as required by the Guideline
Reason / purpose for cross-reference:
reference to same study
Qualifier:
according 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:
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. 37.5 mN/m
Temp.:
20 °C
Conc.:
1 g/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)

1.034 x 103

37.5

20.0

37.5

20.0

37.5

20.0

330.9

39.0

20.0

39.0

20.0

39.0

20.0

103.4

40.5

20.0

40.5

20.0

40.5

20.0

33.09

44.0

20.0

44.0

20.0

44.0

20.0

16.54

49.0

20.0

49.5

20.0

52.0

20.0

52.0

20.0

52.0

20.0

10.34

55.0

20.0

55.5

20.0

57.5

20.0

56.0

20.0

57.5

20.0

57.5

20.0

58.5

20.0

59.5

20.0

60.5

20.0

60.5

20.0

60.5

20.0

6.893

60.5

20.0

61.0

20.0

62.0

20.0

63.0

20.0

63.0

20.0

63.0

20.0

3.309

64.0

20.0

65.0

20.0

67.0

20.0

68.5

20.0

69.5

20.0

69.5

20.0

69.5

20.0

1.034

70.0

20.0

72.0

20.0

72.0

20.0

72.0

20.0

0.3309

73.0

20.0

73.0

20.0

73.0

20.0

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

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

 

Table 2: The concentration (mg/L), log10 [concentration (mg/L)] and mean surface tension values

Concentration
(
mg/L)

Log10Concentration

Mean Surface Tension (mN/m)

Solution pH

1.034 x 103

3.015

37.5

3.73

330.9

2.520

39.0

4.06

103.4

2.015

40.5

4.44

33.09

1.520

44.0

4.72

16.54

1.219

52.0

4.90

10.34

1.015

60.5

5.28

6.893

0.838

63.0

5.13

3.309

0.520

69.5

5.78

1.034

0.015

72.0

5.69

0.3309

-0.480

73.0

5.57

The surface tension at 1 g/L was determined to be 37.5 ± 0.5 mN/m.

Conclusions:
Under the study conditions, the surface tension at nominally 1 g/L of test substance in water was determined to be 37.5 ± 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 a ring method, according to OECD Guideline 115 and EU Method A.5. Under the study conditions, the surface tension of 1 g/L nominal concentration of the test substance in water was determined to be 37.5 ± 0.5 mN/m at 20 ± 0.5ºC. Therefore, the test substance was considered to be surface-active (Envigo, 2018).

Description of key information

The surface tension of the test substance was determined using a ring method, according to OECD Guideline 115 and EU Method A.5 (Envigo, 2018).

Key value for chemical safety assessment

Surface tension:
37.5
in mN/m at 20°C and concentration in mg/L:
1 000

Additional information

(surface active)