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Administrative data

Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
08 January 2009 to 26 February 2009
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Study conducted in compliance with agreed protocols, with no or minor deviations from standard test guidelines and/or minor methodological deficiencies, which do not affect the quality of relevant results.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2009
Report date:
2009

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
yes
Remarks:
This deviation has been considered not to have affected the integrity of the study.
Principles of method if other than guideline:
The determination was carried out using a White Electrical Institute interfacial tension balance and a procedure based on the ISO 304 ring method. With the exception of the following deviation, the experimental procedure used complied with that specified in Method A5 Surface Tension of Commission Regulation (EC) No 440/2008 of 30 May 2008.
1) The surface tension result was not corrected using the Harkins-Jordan correction table as the correction is not applicable to the apparatus used. Once calibrated, the balance and ring assembly used in this test give a direct reading for surface tension that is within the required accuracy (± 0.5 mN/m); this is as a result of the reduced ring dimensions.
GLP compliance:
yes (incl. QA statement)
Remarks:
Date of inspection: 19 August 2008; Date of signature: 04 March 2009
Type of method:
ring method

Test material

Constituent 1
Details on test material:
Sponsor's identification : H-MI ammonium salt
Description : dark red solid
Batch number : MB-1
Date received : 04 December 2008
Storage conditions : room temperature in the dark


Results and discussion

Surface tension
Surface tension:
70 mN/m
Temp.:
21.2 °C
Conc.:
1.05 g/L

Any other information on results incl. tables

Calibration factor (f)

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

Table 2

Reading (mN/m)

Temperature (ºC)

Literature Value (mN/m)

Calibration Factor

72.5

21.2

72.53

1.000

72.5

21.2

72.53

1.000

72.5

21.2

72.53

1.000

72.5

21.2

72.53

1.000

72.5

21.2

72.53

1.000

72.5

21.2

72.53

1.000

Mean Calibration Factor = 1.000

Sample solution readings

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

Table 3

Time (mins)

Reading (mN/m)

Temperature (ºC)

105

70.0

21.2

115

70.0

21.2

140

70.0

21.2

150

70.0

21.2

160

70.0

21.2

Mean reading                 :   70.0 mN/m
Surface tension              = reading x calibration factor
                                         = 70.0 x 1.000
                                         = 70.0 mN/m
Temperature                   :   21.2 ± 0.5ºC
pH of sample solution    :   6.2

Applicant's summary and conclusion

Conclusions:
The surface tension of a 1.05 g/l solution of test material has been determined to be 70.0 mN/m at 21.2 ± 0.5°C. The test material is considered not to be a surface-active material.
Executive summary:

70.0 mN/m (1.05 g/l solution) at 21.2 ± 0.5°C, using a ring method based on ISO 304, Method A5 Surface Tension of Commission Regulation (EC) No 440/2008 of 30 May 2008.