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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 03, 2017 to February 09, 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. 40.5 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)

1.068 x 103

40.5

20.0

40.5

20.0

40.5

20.0

320.4

41.5

20.0

41.5

20.0

41.5

20.0

106.8

43.5

20.0

45.0

20.0

45.5

20.0

46.0

20.0

46.0

20.0

47.0

20.0

47.0

20.0

47.0

20.0

32.04

50.5

20.0

50.5

20.0

50.5

20.0

10.68

52.5

20.0

52.5

20.0

52.5

20.0

3.204

54.0

20.0

55.5

20.0

56.5

20.0

57.0

20.0

57.0

20.0

58.0

20.0

58.5

20.0

58.5

20.0

58.5

20.0

1.068

60.0

20.0

60.0

20.0

60.0

20.0

0.3204

70.0

20.0

70.0

20.0

70.0

20.0

0.1068

72.5

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.

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

1.068 x 103

3.029

40.5

3.56

320.4

2.506

41.5

3.99

106.8

2.029

47.0

4.37

32.04

1.506

50.5

4.80

10.68

1.029

52.5

5.13

3.204

0.506

58.5

5.36

1.068

0.029

60.0

5.49

03204

-0.494

70.0

5.52

0.1068

-0.971

72.5

5.56

The surface tension at 1 g/L was determined to be 40.5 ± 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 40.5 ± 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 ring method, according to OECD Guideline 115 and EU Method A.5. Under the study conditions, the surface tension at nominally 1 g/L of test substance in water was determined to be 40.5 ± 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 the ring method, according to OECD Guideline 115 and EU Method A.5 (Envigo, 2018).

Key value for chemical safety assessment

Surface tension:
40.5
in mN/m at 20°C and concentration in mg/L:
20

Additional information

(surface active)