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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:
2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
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:
no
Other quality assurance:
ISO/IEC 17025 (General requirements for the competence of testing and calibration laboratories)
Type of method:
plate method
Key result
Surface tension:
> 60 mN/m
Temp.:
21 °C
Conc.:
1 g/L
Remarks on result:
other: the test substance is no surface active

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

The following values were recorded:

Table3.2‑a    Measured Values Test substance First Series

Measurement

Time

Mass

Surface Tension

Temperature

No

s

g

mN/m

°C

1

3.0

0.2937

71.65

19.5

2

5.9

0.2926

71.38

19.5

3

8.9

0.2924

71.33

19.5

4

11.9

0.2923

71.31

19.6

5

14.9

0.2923

71.31

19.6

6

17.9

0.2923

71.31

19.6

7

20.9

0.2924

71.33

19.6

8

23.9

0.2915

71.11

19.6

9

26.9

0.2926

71.38

19.6

10

29.9

0.2920

71.23

19.6

Mean

71.33

 

Standard Deviation

0.14

 

Table3.2‑b    Measured Values Test substance Second Series

Measurement

Time

Mass

Surface Tension

Temperature

No

s

g

mN/m

°C

1

3.0

0.2857

69.70

20.3

2

5.9

0.2862

69.82

20.3

3

8.9

0.2864

69.87

20.3

4

11.9

0.2862

69.82

20.3

5

14.9

0.2856

69.67

20.3

6

17.9

0.2868

69.96

20.3

7

20.9

0.2859

69.74

20.3

8

23.9

0.2858

69.72

20.3

9

26.9

0.2862

69.82

20.3

10

29.9

0.2858

69.72

20.3

Mean

69.78

 

Standard Deviation

0.09

 

After the first and the second measurement series, the difference between mean values was less than 5%. Therefore no additional measurement series was required.

Conclusions:
Blendazol Orange is not surface active
Executive summary:

1.1     Result Test Substance

During a certain period of time, no significant changes in the surface tension were detected. In dependence on time and temperature, values between 69.67 and 71.65 mN/m were recorded showing no significant variations. As the determined surface tension ofBlendazol Orangewas higher than 60 mN/m, the test substance can be classified as not surface active.

Description of key information

Key value for chemical safety assessment

Surface tension:
60
in mN/m at 20°C and concentration in mg/L:
1 000

Additional information

During a certain period of time, no significant changes in the surface tension were detected. In dependence on time and temperature, values between 69.67 and 71.65 mN/m were recorded showing no significant variations. As the determined surface tension ofBlendazol Orangewas higher than 60 mN/m, the test substance can be classified asnot surface active.

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