Disodium 4,4'-bis[[1-[[(2,4-dimethylphenyl)amino]carbonyl]-2-oxopropyl]azo][1,1'-biphenyl]-2,2'-disulphonate

Surface tension

Administrative data

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

from 12 April 2016 to 13 April 2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2017

Report date:

2017

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

EU Method A.5 (Surface Tension)

Version / remarks:

2008

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

OECD Guideline 115 (Surface Tension of Aqueous Solutions)

Version / remarks:

1995

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

OECD harmonised ring method

Test material

Reference

Name:

Unnamed

Type:

Constituent

Test material form:

solid: particulate/powder

Details on test material:

- Appearance: yellow/brown powder
- Storage conditions: in refrigerator (2-8°C)

Results and discussion

Surface tension

Key result

Surface tension:

60.3 mN/m

Temp.:

20 °C

Conc.:

1 g/L

Any other information on results incl. tables

Table: Surface tension measurements

 

Measurement	Time passed after transfer test solution to test vessel [minutes]	Surface tension [mN/m]
		individual	Mean (1)	Mean (2)
1	15	58.2	59.3	60.3
2	17	59.2
3	18	59.4
4	19	59.5
5	20	59.4
6	21	59.2

(1) Mean calculated from measurements 2 to 6, after equilibrium was reached.

(2)  Multiplied by the calibration factor and corrected according to Harkins-Jordan.

 

Applicant's summary and conclusion

Conclusions:

The surface tension of a 1 g/L aqueous solution of the substance was determined to be 60.3 mN/m (at 20°C).

Executive summary:

Using the OECD harmonized ring method in a GLP study according to EC A.5 and OECD 115, the surface tension of an aqueous solution of the substance at 1 g/L was determined to be 60.3 mN/m ( at 20°C). According to the EC A.5 guideline the substance is not surface active.