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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 March 05, 2018
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Remarks:
non GLP; 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. 34 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)

1.002 x 104

30.0

20.0

30.0

20.0

30.0

20.0

3.205 x 103

30.5

20.0

30.5

20.0

30.5

20.0

1.068 x 103

34.0

20.0

34.0

20.0

34.0

20.0

320.5

37.0

20.0

37.0

20.0

37.0

20.0

96.16

39.0

20.0

40.0

20.0

40.5

20.0

42.0

20.0

42.0

20.0

42.0

20.0

32.05

43.0

20.0

45.0

20.0

45.0

20.0

45.0

20.0

9.616

49.0

20.0

52.0

20.0

52.0

20.0

52.0

20.0

3.205

61.0

20.0

61.0

20.0

61.0

20.0

0.9616

71.0

20.0

71.0

20.0

71.0

20.0

0.3205

73.0

20.0

73.0

20.0

73.0

20.0

0.09616

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

1.002 x 104

4.001

30.0

6.56

3.205 x 103

3.506

30.5

6.47

1.068 x 103

3.029

34.0

6.13

320.5

2.506

37.0

6.08

96.16

1.983

42.0

5.84

32.05

1.506

45.0

5.67

9.616

0.983

52.0

5.51

3.205

0.506

61.0

5.51

0.9616

-0.017

71.0

5.58

0.3205

-0.493

73.0

5.86

0.09616

-1.017

73.0

5.69

The surface tension at 1 g/L was determined to be 34.0 ± 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 34 ± 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 nominally 1 g/L of test substance in water was determined to be 34 ± 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 ring method, according to OECD Guideline 115 and EU Method A.5 (Envigo, 2018).

Key value for chemical safety assessment

Surface tension:
34
in mN/m at 20°C and concentration in mg/L:
1 000

Additional information

(surface active)