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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:
2010
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:
not specified
Principles of method if other than guideline:
The surface tension and surface tension in liquid solutions was determined. The static surface tension of a liquid is determined according to the ring method using a K10ST difital tensiometer of Krüss. The maximum force required to detach the ring from the liquid surface is measured by a sensitive torsion balance. The surface tension of aqueous systems containing sparsely soluble compounds is readily measured by the OECD Guideline 115. In this case, aqueous solutions of a resin are prepared at 90% of its solubility limit when known. Otherwise, a saturated solution is prepared in deionized water.
GLP compliance:
not specified
Type of method:
ring method
Key result
Surface tension:
ca. 43.3 mN/m
Temp.:
20 °C
Remarks on result:
other: The above value correspond to the static surface tension of a liquid.
Key result
Surface tension:
ca. 51.4 mN/m
Temp.:
20 °C
Conc.:
30 mg/L

Results:

Sample #

Surface Tension (mN/m)

Temperature

(°C)

Method used

DPHA® (#JBHA0020T)

43.3

20

DuNoüy ring

Saturated solution (30 mg DPHA/L deionized water)1

51.4

20

DuNoüy ring

Conclusions:
Under the study conditions, the static surface tension of a liquid and saturated solution of DPHA was determined to be 43.3 and 51.4mN/m, respectively at 20⁰C.
Executive summary:

A study was conducted to determine the surface tension of the test substance DPHA, using the ring method according to the OECD Guideline 115. The static surface tension of a liquid is determined according to the ring method using a K10ST difital tensiometer of Krüss. The maximum force required to detach the ring from the liquid surface is measured by a sensitive torsion balance. The surface tension of aqueous systems containing sparsely soluble compounds is readily measured by OECD Guideline 115. In this case, aqueous solutions of a resin are prepared at 90% of its solubility limit when known. Otherwise, a saturated solution is prepared in deionized water. Under the study conditions, the static surface tension of a liquid and saturated solution of DPHA was determined to be 43.3 and 51.4mN/m, respectively at 20⁰C (Herssens, 2010).

Description of key information

The surface tension of the test substance was determined using the ring method according to OECD Guideline 115 (Herssens, 2010).

Key value for chemical safety assessment

Surface tension:
51.4
in mN/m at 20°C and concentration in mg/L:
30

Additional information