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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:
January 25, 2017 - January 26, 2017
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:
no
Type of method:
OECD harmonised ring method
Key result
Surface tension:
< 60 mN/m
Temp.:
19.9 °C
Conc.:
1 g/L

200.0 mg of the test item were put into 200 mL of demin. water and stirred at ambient temperature for 21 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 (19.9 °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)

993

1054

1114

1175

1235

1295

s(mN/m) uncorrected

59.8

59.7

59.7

59.6

59.6

59.5

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

54.4

54.4

54.3

54.3

54.2

54.2

Due to the fact that the surface tension showed a slight time-dependence no mean value could be reported as final result. 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

Conclusions:
The surface tension of the aqueous solution at 20 °C was ca 54.2 mN/m after ca. 20 min and thus 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 ca 54.2 mN/m after ca. 20 min and thus lower than 60 mN/m. The test item had surface-active properties.

Key value for chemical safety assessment

Surface tension:
54.2
in mN/m at 20°C and concentration in mg/L:
1 000

Additional information

Due to the fact that the surface tension showed a slight time-dependence (from 54.4 mN/m at 993 sec to 54.2 mN/m at 1295 sec) no mean value could be reported as final result. However, as the surface tension was ca 54.2 mN/m after ca. 20 min and thus lower than 60 mN/m, the test item had surface-active properties.