2,7-Naphthalenedisulfonic acid, 4-amino-5-hydroxy-, coupled with 3-aminophenol, diazotized 5-amino-2-[(4-aminophenyl)amino]benzenesulfonic acid and diazotized benzenamine, sodium salts

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

February from 19 to 20, 1991

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

test procedure in accordance with generally accepted scientific standards and described in sufficient detail

Qualifier:

according to guideline

Guideline:

OECD Guideline 115 (Surface Tension of Aqueous Solutions)

Deviations:

yes

Remarks:

As an alternative, Wilhelmy plate method was used instead of ring method

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

GLP compliance:

yes

Type of method:

plate method

Surface tension:

72.4 mN/m

Temp.:

20 °C

Conc.:

0.1 g/L

Remarks on result:

other: average value of two experiments.

Surface tension:

69.3 mN/m

Temp.:

20 °C

Conc.:

1 g/L

Remarks on result:

other: average value of two experiments.

Surface tension:

59 mN/m

Temp.:

20 °C

Conc.:

10 g/L

Remarks on result:

other: average value of two experiments.

The results obtained in the two experiments are presented below.

Experiment 1

Concentration (g/l)	σ (solution) mN/m		σ corr. For φb  (mN/m)
	minutes	readings
10 g/l	0	60.4	60.1
	1	59.9	59.6
	5	59.5	59.2
	10	59.1	58.8
	15	58.9	58.6
	20	58.8	58.5
1.0 g/l	0	70.4	70.0
	1	70.0	69.6
	5	69.9	69.5
	10	69.8	69.4
0.1 g/l	0	72.5	72.1
	1	72.4	72.0
	5	72.6	72.2
	10	72.7	72.3

Experiment 2

Concentration (g/l)	σ (solution) mN/m		σ corr. For φb  (mN/m)
	minutes	readings
10 g/l	0	61.0	60.7
	1	60.6	60.3
	5	60.1	59.8
	10	59.9	59.6
	15	59.8	59.5
	20	59.7	59.4
1.0 g/l	0	70.2	69.8
	1	69.9	69.5
	5	69.6	69.2
	10	69.6	69.2
0.1 g/l	0	72.7	72.3
	1	72.4	72.3
	5	72.8	72.4
	10	72.9	72.5

The Harkins-Jordan hydrostatic correction is not necessary when using the Wilhelmy plate method.

Conclusions:

The substance is not surface active.

Executive summary:

The substance was assessed for its surface tension by using the Wilhemy plate method, according to the guidelines OECD 115, EEC A.5 and ISO 304. Three different concentrations (two preparations of each concentration) of the substance were prepared in distilled water and their surface tension was measured in specific time intervals, at the temperature of 20 °C. The reading was calibrated by the use of double distilled water and the calibration factor was determined in order to be used for the calculation of the surface tension of the test substance.

Surface tension, at 20 °C, obtained as mean value of the two experiments:

σ = 72.4 mN/m at 0.1 g/l

σ = 69.3 mN/m at 1.0 g/l

σ = 59.0 mN/m at 10 g/l

Conclusion

The substance is not considered to be a surface-active as the surface tension of the two out of three concentrations is above 60 mN/m, while the surface tension of the higher concentration is sligthly below 60 mN/m.

Description of key information

Non-surface active

Key value for chemical safety assessment

Surface tension:

69.3

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

1 000

Additional information

OECD guideline 115 - plate method