N,N'-(2-(4-(2-aminobenzamido)butyl)pentane-1,5-diyl)bis(2-aminobenzamide)

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

Experimental Phase:14 June 2020 to 05 September 2020.

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:

ca. 75.2 mN/m

Temp.:

20.4 °C

Conc.:

90 other: w/w

Conclusions:

The surface tension of duplicate, nominally 90% saturated solutions of the test item in water were determined to be 72.5 mN/m at 20.4 ± 0.5 °C. The test item was considered not to be surface-active.

Executive summary:

Introduction

The surface tension of the test item was determination using a procedure designed to be compatible with the following guidelines:

• Method A.5 Surface Tension of Commission Regulation (EC) No. 440/2008 of 30 May 2008
• Method 115 of the OECD Guidelines for the Testing of Chemicals, 27 July 1995.

 

Method

 

The determination was carried out by a ring method using the following apparatus:

 

• White Electrical Institute Co. Ltd. Model “OS” torsion balance for surface and interfacial tension measurements. The measuring body consisted of a 4 cm circumference platinum (Du Nouy) ring. The balance and ring assembly give a direct reading of surface tension that is within the required accuracy (± 0.5 mN/m).
  
  
• Purified Water: Reverse osmosis water with a resistivity of greater than 15 MΩ.

An aliquot of each sample solution was transferred to an individual measuring vessel and allowed to equilibrate for at least one hour at ambient temperature.

In turn, each measuring vessel was placed onto the adjustable sample platform of the torsion balance. The platform was raised until the platinum ring was in contact with the surface of the solution and, as this disrupts the arrangement of the surface layer, left to settle for a period of two minutes. The force required to overcome the surface tension of the liquid was recorded directly from the torsion balance. Since the surface tension of a solution may alter over time, several measurements were made until a consistent value was obtained.

The pH of the sample solutions was measured.

 

Results and Conclusion

The surface tension of duplicate, nominally 90% saturated solutions of the test item in water has been determined to be 72.5 mN/m at 20.4 ± 0.5 °C. The test item was considered not to be surface-active.

Description of key information

Surface tension data summary.

Key value for chemical safety assessment

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

72.5

Additional information

The surface tension of duplicate, nominally 90% saturated solutions of the test item in water were determined to be 72.5 mN/m at 20.4 ± 0.5 °C. The test item was considered not to be surface-active.