Pentanediamide, N1,N5-dibutyl-2-[(2-ethyl-1-oxohexyl)amino]-, (2S)-

Surface tension

Link to relevant study record(s)

Reference

Endpoint:

surface tension

Type of information:

experimental study

Adequacy of study:

key study

Study period:

15 February 2011

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

Surface tension:

67.6 mN/m

Temp.:

20 °C

Conc.:

9.9 mg/L

In order to describe the time dependence of the surface tension after transferring the solution to the measurement vessel, repeated measurements were carried out with increasing the equilibrium time. A constant surface tension was reached after about 340 sec (see Table 1). The surface tension of the test substance aqueous solution read on the instrument was 67.9 mN/m at 20 °C using the ring method representing the mean of five separate measurements. The equilibrium time for these five measurements was 350 sec. The details are shown in Table 2. The measured surface tension was multiplied by φa and then corrected according to Harkins and Jordan, resulting in a corrected surface tension of 67.6 mN/m.

As the surface tension value was higher than 60 mN/m, the test substance is not classified as surface active.

Table 1. Time dependence of the surface tension after transferring the solution to the measurement vessel

Surface tension (mN/m)	Equilibrium time (sec)
64.5	300
66.2	310
66.8	320
67.9	330
68.0	340
68.0	350

 Equilibrium time = time after transferring the solution to the vessel until measuring the surface tension of the solution

Table 2: Measured surface tension values and equilibrium times

Surface tension (mN/m)	Equilibrium time (sec)
67.9	350
67.9	350
68.0	350
68.0	350
67.9	350

Equilibrium time = time after transferring the solution to the vessel until measuring the surface tension of the solution

Conclusions:

The measured value of the 9.9 mg/L aqueous solution of the test item was found to be 67.6 mN/m at 20 °C.
As the surface tension value was higher than 60 mN/m, the test substance is not classified as surface active.

Executive summary:

The determination of the surface tension was carried out on the test item, with the use of a Krüss K6 Tensiometer by ring method. The study was conducted to OECD test method 115 and EU test method A.5. The measured value of the 9.9 mg/L aqueous solution of the test item was found to be 67.6 mN/m at 20 °C.

As the surface tension value was higher than 60 mN/m, the test substance is not classified as surface active.

Description of key information

The measured value of the 9.9 mg/L aqueous solution of the test item was found to be 67.6 mN/m at 20 °C using the ring method.

As the surface tension value was higher than 60 mN/m, the test substance is not classified as surface active.

Key value for chemical safety assessment

Surface tension:

67.6

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

9.9

Additional information

The determination of the surface tension was carried out on the test item, with the use of a Krüss K6 Tensiometer by ring method. The study was conducted to OECD test method 115 and EU test method A.5. The measured value of the 9.9 mg/L aqueous solution of the test item was found to be 67.6 mN/m at 20 °C.

As the surface tension value was higher than 60 mN/m, the test substance is not classified as surface active.