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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 21 May 2012 to 30 August 2012
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:
yes (incl. QA statement)
Remarks:
2012-12-15
Type of method:
ring method
Key result
Surface tension:
> 38.2 - < 38.8 mN/m
Temp.:
20 °C
Conc.:
1 g/L
Remarks on result:
other: concentration expressed in acitve content

Results with demineralized water:

Assay N° Temperature (°C) Time Surface tension (mN/m) Results
1 20,1 To  76,6 76,6
To + 2min 76,6
To + 4 min  76,6
2 20,4 To  77,2 77,1
To + 2min 77,2
To + 4 min  77,1
3 20,2 To  77,2 77,2
To + 2min 77,2
To + 4 min  77,2

* To corresponds to the first measurement for each assay.

Mean surface tension of water 77.0 ± 0.4 mN/m at 20.2 °C

Calibration factor: φb = (σo / σg) = 0.945

Where σo is 72.75 mN/m (surface tension of water at 20.0 °C; value given in the literature).

σg is 77.0 mN/m (measured surface tension of demineralized water at 20.2 °C).

Results with test item solution at 1g/l

Preparation of the test item solution:

A quantity of 1.391 g of test item was weighed in a 500-mL volumetric flask, and the volume was made up with demineralized water. The solution was magnetically stirred during 2 hours and 15 minutes.

Assay N° Temperature (°C) Time Surface tension (mN/m) Results Mean corrected value suing (mN/m) Mean corrected value according to Harkins & Jordan table (mN/m)
State of equilibrium
1 20,4 To  42,6 42,5 40,3 38,5
To + 2min 42,6
To + 4 min  42,5
2 20,3 To  42,6 42,6
To + 2min 42,6
To + 4 min  42,6
3 20,3 To  42,7 42,8
To + 2min 42,7
To + 4 min  42,8

The mean value according to Harkins & Jordan table is lower than 60 mN/m, so the test item is considered to be surface active in the experimental conditions used.

Conclusions:
The mean surface tension of the test item at 1 g/L in demineralized water was 38.5 ± 0.3 mN/m (corrected value).
The test item was considered as surface-active in the experimental conditions used.
Executive summary:

The surface tension of the substance EC 242-893-1 (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 1.28 g solid content/L) was 38.5 ± 0.3 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 242-893-1 is manufactured and used in a liquid form.

Description of key information

The surface tension of the REACh substance (2-Hydroxy-3-sulphopropyl) dimethyl[3-[(1-oxododecyl) amino]propyl]ammonium hydroxide (EC 242-893-1) in aqueous solution was investigated in a GLP-compliant study (Grevin, 2012) 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 1.28 g solid content/L) was 38.5 ± 0.3 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 242-893-1 is manufactured and used in a liquid form.

Key value for chemical safety assessment

Surface tension:
38.5
in mN/m at 20°C and concentration in mg/L:
1 280

Additional information

The surface tension of the substance EC 242-893-1 in aqueous solution was investigated in a GLP-compliant study (Grevin, 2012) 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.