Pentasodium 2,2'-((2,4-diamino-5-(4-methoxy-2-sulfophenylazo)-1,3-phenylene)bis(azo))bis(5-(2-(sulfonatooxyethyl)sulfonyl)benzenesulfonate

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 April 11, 2006 to June 27, 2006

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)

Type of method:

ring method

Key result

Surface tension:

69.5 mN/m

Temp.:

20 °C

Conc.:

1 000 mg/L

Remarks on result:

other: Final value of surface tension was obtained by multiplying the mean value by the calibration factor (F=1.0016)

Six measurements every 5 min, were performed:

Measurement	1	2	3	4	5	6
Time (min)	0	5	10	15	20	25
Surface tension (mN/m)	69.4	69.5	69.5	69.5	69.5	69.5

The mean value, multiplied by the calibration factor (F=1.0016) yields: Surface tension= 69.592 mN/m

After correction with respect to the table given in the consolidated version of Council Directive 67/548/EEC Annex V method A.5. (Harkins-Jordan correction), the final value for the surface tension at 20°C is: 69.5 mN/m

Details on the calibration of the apparatus:

The calibration of the apparatus was carried out using de-ionized water at 20°C.

Measurement	1	2	3	4	5	6
Time (min)	0	5	10	15	20	25
Surface tension (mN/m)	72.5	72.4	72.4	72.5	72.5	72.5

The surface tension was determined to be 72.467 mN/m.

The calibration factor F was 1.0016, calculated with respect to the literature value for water at 20°C (72.58 mN/m).

Conclusions:

Under the study conditions, the surface tension of the aqueous solution of the test substance at 20°C was 69.5 mN/m. Due to the fact that the surface tension is higher than 60 mN/m, the test substance has no surface-active properties.

Executive summary:

A study was conducted to determine the surface tension of the test substance according to the OECD Guideline 115 and the EU Method A.5, in compliance with GLP.

An aqueous solution of the test item with a concentration of 1.0 g/L was prepared at ambient temperature. After tempering for 3 h at 20°C, the measurement of surface tension was carried out. Six measurements at a temperature of 20 °C, every 5 min, were carried out with the test substance. Before the measurement a calibration of the apparatus was carried out using de-ionized water at 20°C.

Under the study conditions, the surface tension of the aqueous solution of the test substance at 20°C was 69.5 mN/m. Due to the fact that the surface tension is higher than 60 mN/m, the test substance has no surface-active properties.

 

Description of key information

The surface tension of an aqueous solution of the test substance at 20°C was 69.5 mN/m (Smeykal, 2006).

Key value for chemical safety assessment

Surface tension:

69.5

in mN/m at 20°C and concentration in mg/L:

1 000