2-Naphthalenesulfonic acid, 7-amino-4-hydroxy-3,8-bis[[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]azo]-, trisodium 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)

GLP compliance:

no

Other quality assurance:

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

Type of method:

plate method

Specific details on test material used for the study:

A solution of the test substance containing 1.00 g/L in water HPLC grade was prepared. 0.1001 g of the test item was weighed into a 100 mL volumetric flask and was dissolved in water. The flask was filled up with water to the mark.

Key result

Surface tension:

> 60 mN/m

Temp.:

20 °C

Conc.:

1 g/L

The test substance solution was held at constant temperature (20.0 ± 0.4 °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	2.9	0.2888	70.45	20.3
2	5.9	0.2923	71.31	20.3
3	8.9	0.2922	71.28	20.3
4	11.9	0.2922	71.28	20.3
5	14.9	0.2921	71.26	20.3
6	17.9	0.2920	71.23	20.3
7	21.0	0.2921	71.26	20.3
8	23.9	0.2922	71.28	20.3
9	26.9	0.2925	71.35	20.4
10	29.9	0.2922	71.28	20.4
Mean			71.20
Standard Deviation			0.26

Table3.2‑b    Measured Values Test substance Second Series

Measurement	Time	Mass	Surface Tension	Temperature
No	s	g	mN/m	°C
1	3.0	0.2918	71.18	19.9
2	5.9	0.2913	71.06	19.9
3	8.9	0.2917	71.16	19.9
4	11.9	0.2916	71.13	19.9
5	14.9	0.2917	71.16	19.9
6	17.9	0.2915	71.11	19.9
7	20.9	0.2915	71.11	19.9
8	23.9	0.2912	71.04	19.9
9	26.9	0.2916	71.13	19.9
10	29.9	0.2913	71.06	19.9
Mean			71.12
Standard Deviation			0.05

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:

The surface tension of the aqueous solution at 20 °C is higher than 60 mN/m. The test item has no surface-active properties.

Executive summary:

The surface tension of an aqueous solution of Reactive Red Blendwell was determined using the tensiometer method according to t to OECD 115 resp. EU A.5 test guideline.

The surface tension was dermined by 2 series of measurements , at 20˚C , obaining a values between 70.45 and 71.35 mN/m

As the determined surface tension of Blendazol Red was higher than 60 mN/m, the test substance can be classified as not surface active.

Description of key information

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 70.45 and 71.35 mN/m were recorded showing no significant variations. As the determined surface tension ofBlendazol Redwas 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

 Validity

Literature value for the surface tension of H₂O at 21.0 °C: 72.60 mN/m (taken from Vargaftik et al., “International Tables of the Surface Tension of Water”, J. Phys. Chem. Ref. Data 12, 817, 1983).

The surface tension of the negative control was determined with 72.57 mN/m at 21.1 °C, therefore showing a difference of 0.04% from the stated literature value. The difference lies within the accepted range of 1% deviation from literature value.