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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:
May 02, 2018 to May 04, 2018
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:
ring method
Key result
Surface tension:
<= 57.3 mN/m
Temp.:
20.1 °C
Conc.:
900 mg/L

250.2 mg of the test item were put into 250 mL of de-ionized water (1000.8 mg/L) and stirred at ambient temperature. The test item was not completely solved after the stirring period. The test item was slighty turbid. Therefore the solution was filtered and diluted to 90 %. After adapting to 20 °C the measurement of the surface tension with the test item was carried out at 20 ±0.5°C (20.1 °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)

1242

1364

1485

1606

1727

1848

s(mN/m) uncorrected

62.73

62.67

62.58

62.54

62.52

62.44

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

57.32

57.26

57.17

57.13

57.11

57.03

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

Surface tension:
57
in mN/m at 20°C and concentration in mg/L:
900

Additional information

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