Registration Dossier

Diss Factsheets

Physical & Chemical properties

Surface tension

Currently viewing:

Administrative data

Link to relevant study record(s)

Reference
Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
November 16, 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
Type of method:
OECD harmonised ring method
Key result
Surface tension:
< 35.03 mN/m
Temp.:
20 °C
Conc.:
1 001.6 mg/L

250.4 mg of the test item were put into 250 ml of de-ionized water and stirred at ambient temperature for 22 h. The test item was completely solved after the stirring period. After adapting to 20 °C the measurement of the surface tension with the test item was carried out at 20 ±0.5°C (20.0 °C), as follows:

The solution to be measured was transferred to the measurement vessel, taking care to avoid foaming. The measurement vessel was placed on the table of the test apparatus. The measurement vessel was raised until the ring was immersed below the surface of the solution. The time from starting the measurement was recorded (see Table1 below). Subsequently, the table top was lowered gradually and evenly at a rate of 0.3 cm/min to detach the ring from the surface until the maximum force was reached. The force was read on the tensiometer. The measurements were repeated until 6 measurements were within the limits of the stability criterion.

Table1: Surface tension

Measurement

1

2

3

4

5

6

Time (s)

890

1011

1133

1254

1376

1498

s(mN/m) uncorrected

39.51

39.43

39.38

39.33

39.26

39.22

s(mN/m) corrected according to Zuidema and Waters[1]

35.03

34.97

34.92

34.86

34.81

34.77

Due to the fact that the surface tension showed a time-dependence, no mean value could be reported. However, as the surface tension was lower than 60 mN/m, the test item had surface-active properties.


[1]Zuidema, H., Waters, C.W.,Ind. Eng.Chem. Analyt.13 (1941), S. 312

Executive summary:

The surface tension of the aqueous solution at 20 °C had a value below 35.03 mN//m. Sincea time-dependence was observed, no mean value could be reported. The test item had surface-active properties.

Description of key information

The surface tension of the aqueous solution at 20 °C had a value below 35.03 mN//m. Sincea time-dependence was observed, no mean value could be reported. The test item had surface-active properties.

Key value for chemical safety assessment

Additional information