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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 09, 2017 to March 02, 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
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. 31 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)

1.003 x 104

28.5

20.0

28.5

20.0

28.5

20.0

3.008 x 103

31.5

20.0

31.5

20.0

31.5

20.0

1.005 x 103

35.0

20.0

32.0

20.0

31.0

20.0

31.0

20.0

31.0

20.0

603.0

30.5

20.0

30.5

20.0

30.5

20.0

301.5

31.5

20.0

29.0

20.0

30.5

20.0

32.0

20.0

32.0

20.0

32.0

20.0

180.9

36.0

20.0

35.0

20.0

35.0

20.0

35.0

20.0

100.5

37.0

20.0

37.0

20.0

38.0

20.0

42.5

20.0

44.5

20.0

45.5

20.0

47.0

20.0

47.0

20.0

47.0

20.0

60.30

35.5

20.0

51.5

20.0

51.5

20.0

51.5

20.0

30.15

43.0

20.0

52.0

20.0

54.0

20.0

54.0

20.0

54.0

20.0

10.05

52.0

20.0

62.0

20.0

62.0

20.0

62.0

20.0

3.015

69.5

20.0

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.

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

1.003 x 104

4.001

28.5

5.80

3.008 x 103

3.478

31.5

5.85

1.005 x 103

3.002

31.0

5.93

603.0

2.780

30.5

6.06

301.5

2.479

32.0

6.04

180.9

2.257

35.0

6.04

100.5

2.002

47.0

5.93

60.30

1.780

51.5

5.87

30.15

1.479

54.0

5.95

10.05

1.002

62.0

5.94

3.015

0.479

73.0

5.96

The surface tension at 1 g/L was determined to be 31.0 ± 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 31 ± 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, 'mono- and di- C16 PSE, K+ + C16-18-OH' (100 %), 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 31 ± 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:
31
in mN/m at 20°C and concentration in mg/L:
20

Additional information

(surface active)