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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:
Experimental starting date: 11 August 2012. Experimental completion date: 10 October 2012
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
GLP compliance:
yes (incl. QA statement)
Type of method:
ring method
Surface tension:
66.5 mN/m
Temp.:
20.2 °C
Conc.:
1.06 g/L
Remarks on result:
other: sample 1
Surface tension:
65.5 mN/m
Temp.:
20.2 °C
Conc.:
1.06 g/L
Remarks on result:
other: sample 2

Calibration factor (Φb)

The readings, temperatures and the corresponding calibration factors for purified water are shown in the following tables:

Sample 1

Reading (mN/m)

Temperature (°C)

Literature value (mN/m)

Calibration factor

73.0

20.0

72.72

0.996

73.0

20.2

72.69

0.996

73.0

20.2

72.69

0.996

73.0

20.2

72.69

0.996

73.0

20.2

72.69

0.996

73.0

20.2

72.69

0.996

Mean calibration factor = 0.996

 

Sample 2

Reading (mN/m)

Temperature (°C)

Literature value (mN/m)

Calibration factor

73.0

20.0

72.72

0.996

73.0

20.2

72.69

0.996

72.5

20.4

72.66

1.002

72.5

20.2

72.69

1.003

73.0

20.2

72.69

0.996

73.0

20.0

72.72

0.996

Mean calibration factor = 0.998

 

Sample solution readings

The readings, times and temperatures for the sample solution are shown in the following tables:

Sample 1

Time (mins)

Reading (mN/m)

Temperature (°C)

144

67.0

20.0

153

67.0

20.2

163

67.0

20.2

173

66.5

20.2

185

66.5

20.2

Mean sample reading= 66.8

 

Sample 2

Time (mins)

Reading (mN/m)

Temperature (°C)

144

66.0

20.0

153

66.0

20.2

163

64.5

20.4

174

65.5

20.2

192

66.0

20.2

Mean sample reading= 65.6

 

Surface tension = reading x calibration factor

Sample 1 = 66.5 mN/m

Sample 2 = 65.5 mN/m

Temperature : 20.2 ± 0.5 ºC

pH of sample solution : Sample 1: 6.5

Sample 2: 6.8

Conclusions:
The surface tension of the test material was assessed according to OECD guideline 115 and determined to be in the range 65.5 to 66.5 mN/m at 20.2 ± 0.5 °C with a 1,03 to 1.06 g/L solution of test material in water. The test material is considered not to be surface active.
Executive summary:

The surface tension of a 1.03 to 1.06 g/L solution of test item in water has been determined to be in the range 65.5 to 66.5 mN/m at 20.2 ± 0.5 °C, using a ring method, designed to be compatible with Method A5 Surface Tension of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 115 of the OECD Guidelines for Testing of Chemicals, 27 July 1995. The test item is considered not to be surface active.

Description of key information

The surface tension of a 1.03 to 1.06 g/L solution of the test item in water has been determined to be in the range 65.5 to 66.5 mN/m at 20.2 ± 0.5 °C. The test material is considered not to be surface active.

Key value for chemical safety assessment

Surface tension:
66
in mN/m at 20°C and concentration in mg/L:
1.06

Additional information

The surface tension of a 1.03 to 1.06 g/L solution of test item in water has been determined to be in the range 65.5 to 66.5 mN/m at 20.2 ± 0.5 °C, using a ring method, designed to be compatible with Method A5 Surface Tension of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 115 of the OECD Guidelines for Testing of Chemicals, 27 July 1995. The test item is considered not to be surface active.