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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:
July 04, 2018 - July 06, 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:
no
Type of method:
OECD harmonised ring method
Key result
Surface tension:
71.3 mN/m
Temp.:
20.3 °C
Conc.:
11.6 mg/L
Remarks on result:
other: substance not completely solved

5.8 mg of the test item were put into 500 ml of de-ionized water and stirred at ambient temperature for about two days. The test item was not completely solved after the stirring period. 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 (20.3 °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 werewithin the limits of the stability criterion.

Table1: Surface tension

Measurement

1

2

3

4

5

6

Time (s)

16

137

257

378

498

619

s(mN/m) uncorrected

76.76

76.76

76.76

76.76

76.76

76.76

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

71.28

71.29

71.30

71.31

71.31

71.30

Mean value:   s = 71.30 mN/m (correctedaccording toZuidema and Waters1)

The aqueous solution of the test item had a mean surface tension of 71.30 mN/m. As the surface tension was higher than 60 mN/m, the test item had no 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 mean value of 71.30 mN/m. The test item had no surface-active properties.

Description of key information

The surface tension of the aqueous solution at 20 °C had a mean value of 71.30 mN/m. The test item had no surface-active properties.

Key value for chemical safety assessment

Surface tension:
71.3

Additional information