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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:
From 12 June 2012 to 06 August 2012
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Study conducted in compliance with international standard guidelines under GLP conditions. The study report was well documented with all mandatory information included
Qualifier:
according to guideline
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Remarks:
11-04-11
Type of method:
plate method
Surface tension:
> 62.73 - < 63.35 mN/m
Temp.:
20.5 °C
Conc.:
1 g/L
Remarks on result:
other: the concentration of 1 g/l refers to the all species present in the solution excepted water

Results :

The test item solution was held at constant temperature (20.0 ± 0.5°C). 60 minutes after conclusion of the first measurement series, a second measurement series was performed for verification purposes.

The following table present the results for the first measurement serie :

Measurement

Time

Mass

Surface Tension

Temperature

No

s

g

mN/m

°C

1

2.9

0.2548

62.16

20.5

2

5.8

0.2590

63.18

20.5

3

8.9

0.2589

63.16

20.5

4

11.8

0.2587

63.11

20.5

5

14.9

0.2587

63.11

20.5

6

17.8

0.2590

63.18

20.5

7

20.9

0.2586

63.08

20.5

8

23.9

0.2589

63.16

20.5

9

26.9

0.2587

63.11

20.5

10

29.9

0.2587

63.11

20.5

Mean

63.04

 

Standard Deviation

0.31

 

The following table present the results for the second measuring serie :

Measurement

Time

Mass

SurfaceTension

Temperature

No

s

g

mN/m

°C

1

2.9

0.2554

62.30

20.3

2

5.9

0.2598

63.38

20.3

3

8.9

0.2598

63.38

20.3

4

11.9

0.2593

63.26

20.3

5

14.9

0.2596

63.33

20.3

6

17.9

0.2595

63.30

20.3

7

20.9

0.2594

63.28

20.3

8

23.9

0.2594

63.28

20.3

9

26.9

0.2597

63.35

20.3

10

29.9

0.2594

63.28

20.3

Mean

63.21

 

Standard Deviation

0.32

 

During the specified period of time, no significant changes in the surface tension were detected. Single values between 62.16 and 63.38 mN/m were recorded showing no significant variations. As the determined surface tension of the test item was higher than 60 mN/m, the test item can be classified as not surface active

Conclusions:
The surface tension of an aqueous solution of the test item was determined as 63.04 ± 0.31 mN/m at 20.5 °C.
As all measured values were higher than 60 mN/m, the aqueous solution of the test item was classified as not surface active.
Executive summary:

This study was performed according to Method 115 of OECD Guidelines for Testing of Chemicals 27 July 1995, Method A3 Surface tension of Commission Regulation (EC) No 440 /2008 of 30 May 2008 and GLP. The plate method was used for the determination of the surface tension. No deviation from the guideline was observed during the test.

The test item solution was filled into the measuring vessel, taking care not to produce bubbles. The measuring vessel was set into the thermostat of the apparatus. The measuring table was then moved up so that the measuring plate will hange about 2 mm above the surface of the solution. After that, the automatic measurement process was started : the table slowly moved upwards with about 0.2 cm/min until the surface was detected. Now the table moved down, until the maximum force necessary to pull the plate out of the solution was reached.

Two measurement series were performed. The second measurement series was performed 60 minutes after the first measurement series. During the specified period of time, no significant changes in the surface tension were detected. Single values between 62.16 and 63.38 mN/m were recorded showing no significant variations. The surface tension of the test item was determined as 63.04 ± 0.31 mN/m at 20.5°C. As the determined surface tension of the aqueous solution of the test item of Reaction mass was higher than 60 mN/m, the test item can be classified as not surface active.

Description of key information

Experimental surface tension value : 63.04 ± 0.31 mN/m at 20.5 °C. 
The test item isn't a surface active agent

Key value for chemical safety assessment

Surface tension:
63.04
in mN/m at 20°C and concentration in mg/L:
1 000

Additional information

Th experimental determination of the surface tension was performed according to Method 115 of OECD Guidelines for Testing of Chemicals 27 July 1995, Method A3 Surface tension of Commission Regulation (EC) No 440 /2008 of 30 May 2008 and GLP. The plate method was used for the determination of the surface tension. No deviation form the guidelines was observed.

The values of the single determinations show no significant difference (0.27% between mean values of the two measurement series). All measured values lay clearly above the threshold for surface tension which is stated in the guidelines (60mN/m).

The surface tension of the negative control was determined with a difference of 0.52% from the stated literature value.

Therefore, the result of the test is considered valid and the test item aqueous solution is classified as “not surface active”.