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Physical & Chemical properties

Surface tension

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Administrative data

Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
Experimental Starting Date: 20 July 2012; Experimental Completion Date: 23 January 2013
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Study conducted to GLP and in compliance with agreed protocols, with no or minor deviations from standard test guidelines and/or minor methodological deficiencies, which do not effect the quality of the relevant results.
Cross-reference
Reason / purpose for cross-reference:
reference to other study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2013

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
ring method

Test material

Constituent 1
Test material form:
other: solid

Results and discussion

Surface tension
Surface tension:
65.2 - 65.6 mN/m
Temp.:
22 °C
Conc.:
1.08 g/L

Any other information on results incl. tables

Results

Calibration factor b)

The readings, temperatures and the corresponding calibration factors for the glass double-distilled water are shown in the following tables:

 

Table 3.9– Sample A

 

Reading (mN/m)

Temperature (ºC)

Literature Value (mN/m)

Calibration Factor

72.5

21.8

72.44

0.999

72.5

21.8

72.44

0.999

72.0

21.8

72.44

1.006

73.0

21.8

72.44

0.992

72.0

21.8

72.44

1.006

72.0

21.8

72.44

1.006

72.5

21.8

72.44

0.999

72.0

21.8

72.44

1.006

                                                                                        Mean Calibration Factor = 1.003

Table 3.10– Sample B

 

Reading (mN/m)

Temperature (ºC)

Literature Value (mN/m)

Calibration Factor

72.5

21.8

72.44

0.999

72.5

21.8

72.44

0.999

72.0

21.8

72.44

1.006

72.0

21.8

72.44

1.006

72.0

21.8

72.44

1.006

72.5

21.8

72.44

0.999

72.5

21.8

72.44

0.999

72.0

21.8

72.44

1.006

                                                                                        Mean Calibration Factor = 1.004

 

Sample solution readings

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

 

Table 3.11– Sample A

 

Time (mins)

Reading (mN/m)

Temperature (ºC)

65

63.0

21.8

76

63.5

21.8

82

64.5

21.8

89

65.5

21.8

92

65.0

21.8

98

65.0

21.8

110

65.0

21.8

                                               Mean sample reading = 65.0 (last five sample readings on a plateau)

Table 3.12– Sample B

 

Time (mins)

Reading (mN/m)

Temperature (ºC)

207

64.0

21.8

216

64.5

21.8

223

65.5

21.8

232

65.0

21.8

241

65.5

21.8

250

65.0

21.8

255

65.5

21.8

                                               Mean sample reading = 65.3 (last five sample readings on a plateau)

Surface tension =                    reading x calibration factor
Sample A                   =                    65.2 mN/m
Sample B                   =                    65.6 mN/m
Temperature:                                  22.0 ± 0.5 ºC

pH of sample solution:                       Sample A = 4.0
                                                         Sample B = 4.0

      

Discussion

Substances showing a surface tension lower than 60 mN/m are regarded as being surface active.

Applicant's summary and conclusion

Conclusions:
The surface tension of duplicate 1.08 g/L aqueous solutions of test item has been determined to be 65.2 to 65.6 mN/m at 22.0 ± 0.5°C. The test item was considered not to be surface active.



Executive summary:

Method

The determination was carried out 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 the Testing of Chemicals, 27 July 1995.

 

Result

The surface tension of duplicate 1.08 g/L aqueous solutions of test item has been determined to be 65.2 to 65.6 mN/m at 22.0 ± 0.5°C. The test item was considered not to be surface active.