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Surface tension

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Reference
Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
12 Feb 2019 From 24 April, 2008 to 25 April, 2008
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Qualifier:
according to
Guideline:
EU Method A.5 (Surface Tension)
Qualifier:
equivalent or similar to
Guideline:
other:
Version / remarks:
Vargaftik N.B, Volkow, BN, and Voljak, L.D., International tables of the surface tension of water, J .Phys.Chem.Ref. Data, 12, 817 (1983)
Principles of method if other than guideline:
The method is based on the measurement of the force which it is necessary to exert vertically on plate, with an edge in contact with the surface, in order to draw up the film that has formed. Surface tension of water may be influenced by substances which form micelles, such as tensides (= surfactants), or alcohols.
GLP compliance:
yes (incl. certificate)
Type of method:
plate method
Key result
Surface tension:
24.6 mN/m
Temp.:
19.8 °C
Conc.:
1 g/L

Findings ReferenceTest:

Table 1: Measured Values NegativeControl

Measurement

Time

Mass

Surface Tension

Temperature

No

s

g

mN/m

°C

1

4.1

0.2998

73.14

18.1

2

5.1

0.2989

72.92

18.1

3

6.1

0.2988

72.89

18.1

4

7.1

0.2994

73.04

18.1

5

8.1

0.2977

72.62

18.1

6

9.1

0.2990

72.94

18.1

7

10.1

0.2987

72.87

18.1

8

11.1

0.2989

72.92

18.1

9

12.1

0.2989

72.92

18.1

10

13.1

0.2988

72.89

18.1

Mean

72.91

 

Standard Deviation

0.13

 

Findings Main Test:

The test substance solution was held at constant temperature (20.0 ± 0.2 °C). 60 min after conclusion of the first measurement series, a second measurement series was performed for verification purposes.

The following values were recorded:

Table 2: Measured Values Test Item First Series

Measurement

Time

Mass

Surface Tension

Temperature

No

s

g

mN/m

°C

1

4.2

0.1102

26.88

19.8

2

5.1

0.1031

25.15

19.8

3

6.1

0.1014

24.74

19.8

4

7.1

0.1005

24.52

19.8

5

8.1

0.0999

24.37

19.8

6

9.1

0.0992

24.20

19.8

7

10.1

0.0990

24.15

19.8

8

11.1

0.0986

24.05

19.8

9

12.1

0.0984

24.00

19.8

10

13.1

0.0981

23.93

19.8

Mean

24.60

 

Standard Deviation

0.89

 

Table 3: Measured Values Test Item Second Series

Measurement

Time

Mass

Surface Tension

Temperature

No

s

g

mN/m

°C

1

4.1

0.1156

28.20

20.0

2

5.1

0.1069

26.08

20.0

3

6.1

0.1045

25.49

20.0

4

7.1

0.1034

25.22

20.0

5

8.1

0.1024

24.98

20.0

6

9.1

0.1011

24.66

20.0

7

10.0

0.1007

24.57

20.0

8

11.1

0.1003

24.47

20.0

9

12.0

0.1000

24.39

20.0

10

13.1

0.0997

24.32

20.0

Mean

25.24

 

Standard Deviation

1.18

 

Result Test substance:

During the specified period of time, no significant changes in the surface tension were detected. Values ranging from 23.93 mN/m to 28.20 mN/m were recorded showing no significant variations. The values of the single determinations show no significant difference (less than 5 % (2.60%) between mean values of the two measurement series).

VALIDITY

The constants result from the graph of the equation of function in temperature dependence of the surface tension of water. The calculated value for the surface tension of H2O at 18.1°C is: 73.02 mN/m The surface tension of the negative control was determined with 72.91 mN/m at 18.1°C, therefore showing a difference of 0.15 % from the calculated value. The difference lies within the accepted range of 1% deviation from the calculated value.

DISCUSSION AND RESULT

The values of the single determinations show no significant difference (2.60% between mean values of the two measurement series). All measured values lay clearly below the threshold for surface tension which is stated in the guidelines. The surface tension of the negative control was determined with a difference of 0.15 % from the stated literature value. Therefore, the result of the test is considered valid and the test substance is classified as “surface active” in a concentration of 1.00 g/L.

Conclusions:
Under the study conditions, the surface tension of the test substance at a concentration of 1 g/L was determined to be 24.60 ± 0.89 mN/m at 19.8°C.
Executive summary:

A study was conducted to determine the surface tension of the test substance, C12 -18 TMAC (100% active) according to OECD Guideline 115 and EU Method A.5, in compliance with GLP. Under the study conditions, the surface tension of the test substance was determined to be 24.60 ± 0.89 mN/m at 19.8°C. (Muckle, 2019).

Description of key information

The surface tension of the test substance was determined according to OECD Guideline 115 and EU Method A.5 (Muckle, 2019)

Key value for chemical safety assessment

Surface tension:
24.6
in mN/m at 20°C and concentration in mg/L:
1 000

Additional information