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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 08, 2017 to February 13, 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. 45 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)

1.016 x 103

45.0

20.0

45.0

20.0

45.0

20.0

304.8

47.5

20.0

47.5

20.0

47.5

20.0

101.6

49.5

20.0

50.5

20.0

50.5

20.0

50.5

20.0

50.80

53.5

20.0

53.5

20.0

53.5

20.0

30.48

56.5

20.0

56.5

20.0

56.5

20.0

15.24

57.0

20.0

59.0

20.0

60.0

20.0

62.5

20.0

64.0

20.0

64.0

20.0

64.0

20.0

10.16

66.0

20.0

67.0

20.0

68.0

20.0

69.0

20.0

69.0

20.0

69.0

20.0

6.096

67.0

20.0

69.0

20.0

70.5

20.0

70.5

20.0

70.5

20.0

3.048

72.0

20.0

72.0

20.0

72.0

20.0

1.016

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.

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

1.016 x 103

3.007

45.0

4.20

304.8

2.484

47.5

4.59

101.6

2.007

50.5

4.93

50.80

1.706

53.5

5.23

30.48

1.484

56.5

5.30

15.24

1.183

64.0

5.46

10.16

1.007

69.0

5.51

6.096

0.785

70.5

5.52

3.048

0.484

72.0

5.60

1.016

0.007

72.5

5.67

The surface tension at 1 g/L was determined to be 45.0 ± 0.5 mN/m.

Conclusions:
Under the study conditions, the surface tension of 1 g/L nominal test concentration in water was determined to be 45 ± 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 of 1 g/L nominal test concentration in water was determined to be 45 ± 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:
45
in mN/m at 20°C and concentration in mg/L:
1 000

Additional information

(surface active)