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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:
15 January 2016 to 07 December 2017
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:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
OECD harmonised ring method
Key result
Surface tension:
34.65 mN/m
Temp.:
20 °C
Conc.:
90 other: % saturated solution

- The mean surface tension of double-distilled water was measured to be 72.9 mN/m which gave a calibration factor of 72.75/72.9 = 0.9979.

- The mean surface tension of the 90 % saturated solution of the test material, at 20 °C, was 37.25 mN/m.

- Correcting for calibration gave a value of 37.25 × 0.9979 = 37.17 mN/m.

- As the corrected value was < 60 mN/m the Harkins-Jordan correction was also applied as follows:

Final corrected result = (37.17 × 1.06) – 4.75 =34.65 mN/m

Substances showing a surface tension of lower than 60 mN/m under the conditions of the method used are regarded as surface active.

Table 1: Surface Tension Study Results

Time after filling of test vessel

Surface tension reading (mN/m)

Calibration

6 minutes 30 seconds

71.2 (not used – system had not stabilised)

7 minutes 30 seconds

73.0

9 minutes

73.0

11 minutes

72.8

12 minutes 30 seconds

73.0

14 minutes

72.8

16 minutes

72.8

Mean

72.9

Calibration correction factor: Literature surface tension of water (72.75 mN/m) divided by mean measured value

0.9979

Surface tension of the test material

6 minutes 30 seconds

37.0 (not used – system had not stabilised)

8 minutes 30 seconds

40.0 (not used – system had not stabilised)

10 minutes 30 seconds

40.0 (not used – system had not stabilised)

13 minutes

35.8 (not used – system had not stabilised)

14 minutes 30 seconds

37.5

16 minutes

37.5

18 minutes

37.0

19 minutes 30 seconds

37.0

21 minutes

37.0

22 minutes 30 seconds

37.5

Mean

37.25

Mean corrected for calibration = 37.25 x 0.9979

37.17

Harkins-Jordan corrected value

= (calibration corrected mean × 1.06) – 4.75

34.65

Conclusions:
Under the conditions of this study the surface tension of the test material was 34.65 mN/m. As the surface tension, after correction for calibration, was < 60 mN/m the test material was considered to be surface active.
Executive summary:

The surface tension of the test material was investigated in accordance with the standardised guideline OECD 115, under GLP conditions.

The surface tension of the 90 % saturated test material solution was measured by the harmonised ring method.

The mean surface tension of the 90 % saturated solution of the test material, at 20 °C, was 37.25 mN/m. Correcting for calibration gave a value of 32.25 × 0.9979 = 37.17 mN/m. As the corrected value was < 60 mN/m the Harkins-Jordan correction was also applied, (37.17 × 1.06) – 4.75 = 34.65 mN/m.

Under the conditions of this study, the surface tension of the test material was 34.65 mN/m. As the surface tension, after correction for calibration, was < 60 mN/m the test material was considered to be surface active.

Description of key information

Under the conditions of this study, the surface tension of the test material was 34.65 mN/m. As the surface tension, after correction for calibration, was < 60 mN/m the test material was considered to be surface active.

Key value for chemical safety assessment

Surface tension:
34.65

Additional information

The surface tension of the test material was investigated in accordance with the standardised guideline OECD 115, under GLP conditions. The study was awarded a reliability score of 1 in accordance with the criteria set forth by Klimisch et al. (1997).

The surface tension of the 90 % saturated test material solution was measured by the harmonised ring method.

The mean surface tension of the 90 % saturated solution of the test material, at 20 °C, was 37.25 mN/m. Correcting for calibration gave a value of 32.25 × 0.9979 = 37.17 mN/m. As the corrected value was < 60 mN/m the Harkins-Jordan correction was also applied, (37.17 × 1.06) – 4.75 = 34.65 mN/m.

Under the conditions of this study, the surface tension of the test material was 34.65 mN/m. As the surface tension, after correction for calibration, was < 60 mN/m the test material was considered to be surface active.

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