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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 October 20, 2017 to January 31, 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:
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. 41 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)

1.001 x 104

40.0

20.0

40.0

20.0

40.0

20.0

3.002 x 103

40.5

20.0

40.5

20.0

40.5

20.0

1.001 x 103

41.0

20.0

41.0

20.0

41.0

20.0

300.2

42.0

20.0

42.0

20.0

42.0

20.0

100.1

44.0

20.0

45.0

20.0

45.5

20.0

45.5

20.0

30.02

50.5

20.0

50.5

20.0

51.0

20.0

15.01

49.5

20.0

53.5

20.0

56.0

20.0

56.0

20.0

56.5

20.0

10.01

60.5

20.0

60.5

20.0

62.5

20.0

62.5

20.0

62.5

20.0

3.002

70.5

20.0

71.0

20.0

71.0

20.0

1.001

72.0

20.0

72.5

20.0

72.5

20.0

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:

 

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

1.001 x 104

4.000

40.0

3.70

3.002 x 103

3.477

40.5

3.78

1.001 x 103

3.000

41.0

3.86

300.2

2.477

42.0

4.23

100.1

2.000

45.3

4.54

30.02

1.477

50.7

5.09

15.01

1.176

56.2

5.32

10.01

1.000

62.5

5.43

3.002

0.4774

70.8

5.67

1.001

0.0004

72.3

5.60

The surface tension at 1 g/L was determined to be 41.0 ± 0.5mN/m.

Conclusions:
Under the study conditions, the surface tension at nominally 1 g/L of test substance in water was determined to be 41 ± 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 the ring method, according to OECD Guideline 115 and EU Method A.5. Under the study conditions, the surface tension of 1 g/L nominal test concentration in water was determined to be 41 ± 0.5 mN/m at 20 ± 0.5ºC. Therefore, the test substance was considered to be surface-active (Envigo, 2018).

Description of key information

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

Key value for chemical safety assessment

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

Additional information

(surface active)