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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 16 May 2012 to 06 December 2012
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
The study was conducted according to internationally recognised guidelines, and under GLP. No deviation affected the quality of the study. The study was performed on the commercial product (aqueous solution) as the test item is manufactured and used in a liquid form.
Reason / purpose for cross-reference:
reference to same 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:
yes (incl. QA statement)
Remarks:
2012-12-15
Type of method:
ring method
Surface tension:
>= 37.3 - <= 37.7 mN/m
Temp.:
20 °C
Conc.:
1 g/L
Remarks on result:
other: mean surface tension of the test item at 1 g/L of active substance in water (corresponding to 1.33 g solid content/L)

Results of calibration with demineralized water :

Assay No. 1

 

Assay No. 2

 

Assay No. 3

Temperature(°C)

19.7

 

Temperature(°C)

20.0

 

Temperature(°C)

20.0

Time

Surface tension (mN/m)

 

Time

Surface tension (mN/m)

 

Time

Surface tension( mN/m)

T0

78.2

 

T0

78.2

 

T0

78.6

T0+ 2 min

78.3

 

T0+ 2 min

78.1

 

T0+ 2 min

78.6

T0+ 4 min

78.3

 

T0+ 3 min

78.2

 

T0+ 3 min

78.6

Results

78.3

 

Results

78.2

 

Results

78.6

Mean surface tension of water : 78.4 ± 0.3 mN/m at 19.9°C

Calibration factor: 0.928

Results with test item at 1 g/l of active substance in deminseralized water:

Content of active substance in the test item : 36.2% w/w

Preparation of the solution : a quantity of 1.381 g of test item was weighed in a 500-mL volumetric flask and the volume was made up with demineralized water. The solution was manually shaking.

Assay No. 1

 

Assay No. 2

 

Assay No. 3

Temperature(°C)

20.0

 

Temperature(°C)

20.1

 

Temperature(°C)

20.1

Time

Surface tension (mN/m)

 

Time

Surface tension (mN/m)

 

Time

Surface tension (mN/m)

T0

42.4

 

T0

42.2

 

T0

42.2

T0+ 2 min

42.5

 

T0+ 3 min

42.2

 

T0+ 3 min

42.3

T0+ 3 min

42.5

 

T0+ 4 min

42.3

 

T0+ 5 min

42.3

The calculation of the surface tension is shown on the following table:

Assay

Measurements (mN/m)

Correction using Φb (mN/m)

Correction according to Harkins & Jordan table (mN/m)

State of equilibrium

1

42.5

39.3

37.5

2

42.3

3

42.3

Mean

42.4

Conclusions:
The mean surface tension of test item solution at 1g/L of active ingredient (corresponding to 1.33 g solid content/L): 37.5 ± 0.2 mN/m (corrected value).
The test item was considered as surface-active in the experimental conditions used.
Executive summary:

The surface tension of the test item (= substance EC 939-455-3 in aqueous commercial product) was investigated in a GLP-compliant study performed in accordance with OECD Guideline 115 (Surface Tension of Aqueous Solutions) and EU Method A.5 (Surface Tension). The mean surface tension of a test item solution at 1g/L of active ingredient (corresponding to 1.33 g solid content/L) was 37.5 ± 0.2 mN/m. The test item was considered as surface-active in the experimental conditions used.

The study was performed on a commercial product (aqueous solution) as the substance EC 939-455-3 is manufactured and used in a liquid form.

Description of key information

The surface tension of the test item (= substance EC 939-455-3 in aqueous commercial product) was investigated in a GLP-compliant study (Colombies, 2013) performed in accordance with OECD Guideline 115 (Surface Tension of Aqueous Solutions) and EU Method A.5 (Surface Tension). The mean surface tension of a test item solution at 1g/L of active ingredient (corresponding to 1.33 g solid content/L) was 37.5 ± 0.2 mN/m. The test item was considered as surface-active in the experimental conditions used.

The study was performed on a commercial product (aqueous solution) as thesubstance EC 939-455-3 is manufactured and used in a liquid form.

Key value for chemical safety assessment

Surface tension:
37.5
in mN/m at 20°C and concentration in mg/L:
1 330

Additional information

The surface tension of the test item (= substance EC 939-455-3 in aqueous commercial product) was investigated in a GLP-compliant study (Colombies, 2013) performed in accordance with standard methods, without deviations. The study is considered as reliable (Klimisch 1) and was selected as key study for the endpoint.