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Surface tension

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Reference
Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reason / purpose for cross-reference:
reference to other study
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
Type of method:
ring method
Surface tension:
60.2 mN/m
Temp.:
20 °C
Conc.:
0.94 mg/L

Results
4.70 mg of the test item was diluted in 5000 mL deionized water.

 

Oil drops on the surface of the test solution were observed. The surface tension of the aqueous phase of the test solution was determined.

Table 1: Surface Tensionof the aqueous phase of theTest Item

Test item
no.

 

1

2

3

4

5

Mean

S.D.

1

Time (s)

503

587

670

755

839

-

-

s(mN/m)
uncorrected

64.4

64.2

64.2

64.1

64.1

64.2

0.12

s(mN/m)
corrected by Harkins and Jordan

60.4

60.2

60.2

60.1

60.1

60.2

0.11

 

Conclusion: A dilution of 0.94 mg/L of the test item shows oil drops on the surface of the test solution, indicating that the solubility of the test item is smaller than 1 mg/L. Nevertheless, the surface tension of the aqueous phase was measured and determined to be 60.2 mN/m. Additionally, the surface tension of the undiluted sample at 20 +/- 0.5 °C is higher than 60 mN/m.

Therefore, the test item has no surface-active properties according to Regulation440/2008 (EC) consolidated version, Annex A.5.″Surface Tension″.

Description of key information

60.2 mN/m at 20 °C (ring method, EU Method A.5.)

Key value for chemical safety assessment

Surface tension:
60.2
in mN/m at 20°C and concentration in mg/L:
0.94

Additional information