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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:
13.09. - 06.12.16
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)
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
GLP compliance:
no
Type of method:
ring method
Key result
Surface tension:
48.1 mN/m
Temp.:
20.1 °C
Remarks on result:
other: Concentration is not known.

199.0 mg of the test item were put into 200 ml of de-ionized water and stirred at ambient temeprature for 22 h. 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 (20.1 °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 Table 1 below and Figure 1 on page 7). 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.

 

Table 1: Surface tension

Measurement

1

2

3

4

5

6

Time (s)

27

88

150

212

273

335

σ (mN/m) uncorrected

53.40

53.31

53.34

53.31

53.27

53.19

σ (mN/m) corrected according to Zuidema and Waters

48.24

48.16

48.18

48.14

48.11

48.04

 Mean value:  σ = 48.1 mN/m (corrected according to Zuidema and Waters)

The aqueous solution of the test item had a mean surface tension of 48.1 mN/m. As the surface tension was lower than 60 mN/m, the test item had surface-active properties.

Conclusions:
The aqueous solution of the test item had a mean surface tension of 48.1 mN/m. As the surface tension was lower than 60 mN/m, the test item had surface-active properties.
Executive summary:

The surface tension was determined according to OECD 115 and A.5. European Commission Regulation (EC) No. 440/2008 using the ring method.The method is based on the measurement of the maximum vertical force, which is necessary to separate a ring being in contact with the liquid filled in a measuring cup from the surface of this liquid.

The aqueous solution of the test item had a mean surface tension of 48.1 mN/m. As the surface tension was lower than 60 mN/m, the test item had surface-active properties.

Description of key information

The surface tension was determined according to OECD 115 and A.5. European Commission Regulation (EC) No. 440/2008 using the ring method.The method is based on the measurement of the maximum vertical force, which is necessary to separate a ring being in contact with the liquid filled in a measuring cup from the surface of this liquid.

The aqueous solution of the test item had a mean surface tension of 48.1 mN/m. As the surface tension was lower than 60 mN/m, the test item had surface-active properties.

Key value for chemical safety assessment

Surface tension:
48.1

Additional information