1-3 dihydroxy-2,4bis-(4-(2-sulfooxyethanesulfonyl)-phenylazo) benzene disodium salt

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2017

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:

no

Other quality assurance:

ISO/IEC 17025 (General requirements for the competence of testing and calibration laboratories)

Type of method:

plate method

Key result

Surface tension:

> 60 mN/m

Temp.:

21 °C

Conc.:

1 g/L

Remarks on result:

other: the test substance is no surface active

The test substance solution was held at constant temperature (20.0 ± 0.5 °C). After conclusion of the first measurement series, a second measurement series was performed for verification purposes.

The following values were recorded:

Table3.2‑a    Measured Values Test substance First Series

Measurement	Time	Mass	Surface Tension	Temperature
No	s	g	mN/m	°C
1	3.0	0.2937	71.65	19.5
2	5.9	0.2926	71.38	19.5
3	8.9	0.2924	71.33	19.5
4	11.9	0.2923	71.31	19.6
5	14.9	0.2923	71.31	19.6
6	17.9	0.2923	71.31	19.6
7	20.9	0.2924	71.33	19.6
8	23.9	0.2915	71.11	19.6
9	26.9	0.2926	71.38	19.6
10	29.9	0.2920	71.23	19.6
Mean			71.33
Standard Deviation			0.14

Table3.2‑b    Measured Values Test substance Second Series

Measurement	Time	Mass	Surface Tension	Temperature
No	s	g	mN/m	°C
1	3.0	0.2857	69.70	20.3
2	5.9	0.2862	69.82	20.3
3	8.9	0.2864	69.87	20.3
4	11.9	0.2862	69.82	20.3
5	14.9	0.2856	69.67	20.3
6	17.9	0.2868	69.96	20.3
7	20.9	0.2859	69.74	20.3
8	23.9	0.2858	69.72	20.3
9	26.9	0.2862	69.82	20.3
10	29.9	0.2858	69.72	20.3
Mean			69.78
Standard Deviation			0.09

After the first and the second measurement series, the difference between mean values was less than 5%. Therefore no additional measurement series was required.

Conclusions:

Blendazol Orange is not surface active

Executive summary:

1.1     Result Test Substance

During a certain period of time, no significant changes in the surface tension were detected. In dependence on time and temperature, values between 69.67 and 71.65 mN/m were recorded showing no significant variations. As the determined surface tension ofBlendazol Orangewas higher than 60 mN/m, the test substance can be classified as not surface active.

Key value for chemical safety assessment

Surface tension:

60

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

1 000

Additional information

During a certain period of time, no significant changes in the surface tension were detected. In dependence on time and temperature, values between 69.67 and 71.65 mN/m were recorded showing no significant variations. As the determined surface tension ofBlendazol Orangewas higher than 60 mN/m, the test substance can be classified asnot surface active.