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Surface tension

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Reference
Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
October 05, 2018 - October 08, 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
OECD harmonised ring method
Key result
Surface tension:
< 60 mN/m
Temp.:
19.8 °C
Conc.:
1 001.2 mg/L

An aqueous solution of the test item in demineralized water with a concentration of 1001.2 mg/L was prepared and stirred for approx. three days at room temperature. After adapting to 20 °C the measurement of the surface tension with the test item was carried out at 20 ± 0.5°C (19.8 °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. Six measurements were performed. A small deviation of the stability criterion was observed. But this did not influence the result, being smaller than 60 mN/m.

Table1: Surface tension

Measurement

1

2

3

4

5

6

Time (s)

1235

1356

1478

1599

1720

1842

s(mN/m) uncorrected

64.74

64.55

64.42

64.23

64.11

63.99

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

59.29

59.10

58.98

58.79

58.67

58.55

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

Description of key information

The surface tension of the aqueous solution at 20 °C was lower than 60 mN/m. The test item had surface-active properties.

Key value for chemical safety assessment

Additional information