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Physical & Chemical properties

Surface tension

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Reference
Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
26 Sep 2016 to 09 Jan 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)
Version / remarks:
July 1995
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
Version / remarks:
May 2008
GLP compliance:
yes (incl. QA statement)
Type of method:
ring method
Key result
Surface tension:
72.7 mN/m
Temp.:
20 °C
Conc.:
90 vol%

CALIBRATION FACTOR (ΦB)

The readings, temperatures and the corresponding calibration factors for the high purity water relevant to Sample Solution A and Sample Solution B are presented in Table 3 and Table 4 respectively.

SAMPLE SOLUTION READINGS

The readings, times and temperatures for Sample Solution A and Sample Solution B are presented in Table 5 and Table 6 respectively.

- Surface tension = reading x calibration factor

- Sample Solution A = 72.5 x 1.003

- Sample Solution A = 72.7 mN/m

- Sample Solution B = 72.5 x 1.002

- Sample Solution B = 72.6 mN/m

- Overall mean = 72.7 mN/m

- Temperature = 20.0 ± 0.5 ºC

- pH of sample solution = Sample Solution A = 6.2; Sample Solution B = 4.8

On completion of the static equilibration period at 20 °C, both aqueous samples contained undissolved, excess test substance; indicating that saturation had been achieved. Following centrifugation and filtration, the isolated supernatants were visually confirmed to be free from any excess, undissolved test substance prior to diluting to 90 % saturation. Prior to completion of the reported determinations, a number of further samples had been prepared at significantly higher initial test substance loading rates. These resulted in slightly reduced but highly variable surface tension values (but still not classified as surface active by the method guidelines, as all values were significantly higher than 60 mN/m). This was attributed to the possible influence of impurities, with the main component of the test substance predicted to be essentially insoluble in water. As such, the actual loading rate used for the definitive, reported determinations of surface tension still significantly exceeded the recommended five times saturation referenced in regulatory water solubility method guidelines. The variability in the sample solution pH values on measurement was attributed to the negligible ion concentration of the solutions in the absence of dissolved content.

Table 3 Water Calibration Data Relevant To Sample Solution A

Reading (mN/m)

Temperature (ºC)

Literature Value (mN/m)

Calibration Factor

72.5

20.0

72.72

1.003

72.5

20.0

72.72

1.003

72.5

20.0

72.72

1.003

72.5

20.0

72.72

1.003

72.5

20.0

72.72

1.003

72.5

20.0

72.72

1.003

72.5

20.0

72.72

1.003

Mean Calibration Factor = 1.003

 

 Table 4  Water Calibration Data Relevant To Sample Solution B

Reading (mN/m)

Temperature (ºC)

Literature Value (mN/m)

Calibration Factor

72.5

20.0

72.72

1.003

72.5

20.0

72.72

1.003

72.5

20.0

72.72

1.003

72.5

20.0

72.72

1.003

72.5

20.0

72.72

1.003

73.0

20.0

72.72

0.996

Mean Calibration Factor = 1.002

Table 5 Sample Solution A Surface Tension Measurements

Time (mins)

Temperature (ºC)

Reading (mN/m)

155

20.0

73.0

165

20.0

72.5

175

20.0

72.5

185

20.0

72.5

195

20.0

72.5

204

20.0

72.5

Mean sample reading = 72.5*

  * Last five sample solution reading values taken as a plateau and used in the calculation of the mean

Table 6 Sample Solution B Surface Tension Measurements

Time (mins)

Temperature (ºC)

Reading (mN/m)

232

20.0

72.5

242

20.0

72.5

252

20.0

72.5

261

20.0

72.5

270

20.0

72.5

Mean sample reading = 72.5

Conclusions:
The surface tension of duplicate 90 % saturated solution of test substance in water has been determined to be in the range 72.7 mN/m at 20.0 ± 0.5 °C.
Executive summary:

The surface tension of the test substance has been determined using the ring method in accordance with OECD TG 115 and EU Method A5 in compliance with GLP. The average surface tension of duplicate 90 % saturated solution of the test substance in water has been determined at 72.7 mN/m at 20.0 ± 0.5 °C. .

Description of key information

Surface tension = 72.7 mN/m at 20.0 ± 0.5 °C, OECD 115, ring method, O'Connor 2017.

Key value for chemical safety assessment

Surface tension:
72.7
in mN/m at 20°C and concentration in mg/L:
20

Additional information