(2-hydroxy-3-sulphopropyl)dimethyl[3-[(1-oxododecyl)amino]propyl]ammonium hydroxide

Surface tension

Link to relevant study record(s)

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.