[No public or meaningful name is available]

Surface tension

Link to relevant study record(s)

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

Qualifier:

according to guideline

Guideline:

other: German standard method "DIN EN 14370"

Deviations:

no

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 115 (Surface Tension of Aqueous Solutions)

Deviations:

not applicable

GLP compliance:

yes (incl. QA statement)

Other quality assurance:

other: Not specified

Type of method:

plate method

Key result

Surface tension:

42.7 mN/m

Temp.:

20 °C

Conc.:

1.002 g/L

Remarks on result:

other: mean value of 5 determinations

Remarks:

Since the test item was not completely soluble, the solution was filtered (0.45 μm) and diluted by a factor of 9/10 (72 mL filtrate diluted with 8 mL demineralized water)

Conclusions:

The surface tension at 20 °C of the the aqueous solution of the substance was 42.7 mN/m (Opala, 2018).

Executive summary:

According to the German standard method "DIN EN 14370" corresponding to OECD Guideline 115 the surface tension of the test item in aqueous solution was determined using a plate tensiometer. A commercially available tensiometer based on the plate method has been used to measure the force which is required to withdraw a horizontally suspended plate from the surface of the test solution. For determination of the surface tension 1.0021 g test item were stirred for 24 h in demineralized water. Since the test item was not completely soluble, the solution was filtered (0.45 μm) and diluted by a factor of 9/10 (72 mL filtrate diluted with 8 mL demineralized water). This solution was clear and was used to determine the surface tension. For verification of the measured values the surface tension of demineralized water was also measured. With a correspondence of the measured value σ (20 °C) = 72.5 mN/m, to the theoretical value σ (20 °C) = 72.75 mN/m, cited in literature, the determination of the surface tension of the test item is considered as valid. The surface tension at 20 °C of the the aqueous solution of the substance was 42.7 mN/m.

Description of key information

The surface tension at 20 °C of the the aqueous solution of the substance was 42.7 mN/m (Opala, 2018).

Key value for chemical safety assessment

Surface tension:

42.7

in mN/m at 20°C and concentration in mg/L:

100.21

Additional information

"Should read: aqueous solution"

For determination of the surface tension 1.0021 g test item were stirred for 24 h in demineralized water. Since the test item was not completely soluble, the test solution was filtered (0.45 μm) and diluted by a factor of 9/10 (72 mL filtrate diluted with 8 mL demineralized water)