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Surface tension

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Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2013-04-10 to 2013-06-20
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
EU Method A.5 (Surface Tension)
Qualifier:
according to
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
GLP compliance:
yes (incl. certificate)
Type of method:
ring method
Surface tension:
72.9 mN/m
Temp.:
21.8 °C
Conc.:
90 vol%
Remarks on result:
other: Not surface active

Surface tension (corrected): reading x calibration factor

Sample A (corrected): 73.1 mN/m x 0.996 = 72.8 mN/m

Sample B (corrected): 73.4 mN/m x 0.996 = 73.1 mN/m

Mean: 72.9 mN/m

Temperature: 21.8 ± 0.5 °C

Solution pH: Sample 1 = 5.6

Sample 2 = 5.6

After the equilibration period, each sample was noted to contain excess, undissolved test item at the surface of the solution; whereas, after centrifugation, each sample (supernatant) was noted to be a clear, colorless solution free from excess, undissolved test item.

A platinum ring with a reduced circumference of 4 cm was used, whereas the guidelines specify 6 cm. Once calibrated, the balance and ring assembly used in this test give a direct reading for surface tension that is within the required accuracy (± 0.5 mN/m). This procedure with respect to the reduced ring dimensions has been considered not to have affected the integrity of the test.

As each (corrected) surface tension value was within 0.5 mN/m of the mean (corrected) value, the mean (corrected) value was considered to be acceptable as the endpoint of the test.

According to criteria mentioned in Method A6, substances showing a surface tension lower than 60 mN/m under the conditions of this method should be regarded as being surface active.

Conclusions:
The surface tension of a 90 % saturated solution in water has been determined to be 72.9 ± 0.5 mN/m at 21.8 ± 0.5 °C. The test item was considered to be not surface-active.
Executive summary:

Guideline

Method A5 Surface Tension of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 115 of the OECD Guidelines for Testing of Chemicals, 27 July 1995.

Method

Ring method

Result

The surface tension of a 90 % saturated solution in water has been determined to be 72.9 ± 0.5 mN/m at 21.8 ± 0.5 °C.

Conclusion

The test item was considered to be not surface-active.

Endpoint:
surface tension
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: analogue substance
Justification for type of information:
Determination of surface tension is not required because available data indicate that structural variation does not influence test results or adverse effect profile (see read-across and category justifications attached in Section 13).
Reason / purpose:
read-across source
Key result
Surface tension:
72.9 mN/m
Temp.:
21.8 °C
Conc.:
90 vol%
Remarks on result:
other: not surface active

Description of key information

The surface tension of a 90 % saturated solution of analogue substance in water has been determined to be 72.9 ± 0.5 mN/m at 21.8 ± 0.5 °C (OECD 115 and EU Method A.5).

Key value for chemical safety assessment

Surface tension:
72.9

Additional information

The surface tension of a 90 % saturated solution of the analogue test item in water, determined according to EC Method A.5 and OECD TG 115, is 72.9 ± 0.5 mN/m at 21.8 ± 0.5 °C. The analogue test item was considered to be not surface-active.