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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:
03 to 04 April 2018
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)
Version / remarks:
27 July 1995
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
no
GLP compliance:
yes
Type of method:
ring method
Specific details on test material used for the study:
SOURCE OF TEST MATERIAL
- Source and lot/batch No.of test material: A0076
- Expiration date of the lot/batch: ~ 2021


STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: Ambient (15±10°C), protected from light
- Stability under test conditions: Stable
- Solubility and stability of the test substance in the solvent/vehicle:
:

TREATMENT OF TEST MATERIAL PRIOR TO TESTING
- Treatment of test material prior to testing: 0.1003 g of the substance was weighed into a 100 ml volumetric flask and made up with HPLC water
to make a 1g/l test sample solution. The solution was placed on a magnetic stirrer to equilibrate overnight.
When the solution was removed from the stirrer, it still appeared very cloudy. It was noticed that there were solid particles on the surface of the liquid as well as suspended within the main body of the liquid.
There was a homogeneous layer of material below the surface layer of floating solids, this was pipetted out to test for the surface tension. The sample produced appeared to be a cloudy liquid.
Surface tension:
52.9 mN/m
Temp.:
19.9 °C
Conc.:
1 g/L

Table. 1 Summary of results

Sample

Sample concentration (g/L)

Temp °C

Measured value (mN/m)

Average value (mN/m)

Correction factor

Corrected value (mN/m)

1

2

3

4

5

Test item

1.0

19.9

52.5

52.7

52.6

52.4

52.7

52.6

1.007

52.9

DI water

 

72.2

72.0

 

 

 

72.1

 

 

Conclusions:
The surface tension of the reaction mass of amines, hydrogenated tallow alkyl and azelaic acid and lithium hydroxide was determined to be 52.9 mN/m at 19.9 °C.
Executive summary:

The study to determine the surface tension of the substance, reaction mass of amines, hydrogenated tallow alkyl and azelaic acid and lithium hydroxide, was performed according to the OECD 115 guideline using ring method (Crane 2018). The method is based on the measurement of the force which it is necessary to exert vertically on a stirrup or ring, in contact with the surface of the liquid, in order to separate it from the surface.

The determination of surface tension was compromised by the nature of the sample. However, a solution was prepared at the maximum permissible concentration. The test item was weighted into a volumetirc flask and a 1 g/L solution was prepared with HPLC water. Despite the presence of small amounts of suspended material, it is considered that this is the best approach possible and has produced a representative result.

The surface tension of the reaction mass of amines, hydrogenated tallow alkyl and azelaic acid and lithium hydroxide was determined to be 52.6mN/m based on 5 measurements. A correction factor of 1.007 was applied comparing a deionised water sample with the factory calibration value, this was used to adjust the values recorded in this study. The corrected surface tension of the test item was 52.9 mN/m.

This is a GLP-compliant and guideline study and is considered reliable without restrictions (Klimisch 1).

Description of key information

The surface tension of the test item is 52.9 mN/m.

Key value for chemical safety assessment

Surface tension:
52.9
in mN/m at 20°C and concentration in mg/L:
1 000

Additional information

The study to determine the surface tension of the substance, reaction mass of amines, hydrogenated tallow alkyl and azelaic acid and lithium hydroxide, was performed according to the OECD 115 guideline using ring method (Crane 2018). The method is based on the measurement of the force which it is necessary to exert vertically on a stirrup or ring, in contact with the surface of the liquid, in order to separate it from the surface.

The surface tension of the reaction mass of amines, hydrogenated tallow alkyl and azelaic acid and lithium hydroxide was determined to be 52.9 mN/m.

This is a GLP-compliant and guideline study and is considered reliable without restrictions (Klimisch 1).