Registration Dossier

Physical & Chemical properties

Surface tension

Currently viewing:

Administrative data

Link to relevant study record(s)

Reference
Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1993-12-06 to 1994-04-20
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Remarks:
The deviation from the guideline has no influence on the result of the study: since the water solubility of the test item is 148 mg/L no 90 % solution was used to determine the surface tension (67.5 mg/L = 46 %). Results were not corrected using the Harkins-Jordan correction table. Since the deviation from the guideline has no influence on the result of the study, this study is used as key study rated with RL2. The test item is considered to be surface active.
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
Version / remarks:
1992
Deviations:
yes
Remarks:
Please refer to the field "Rationale for reliability incl. deficiencies" above
Qualifier:
according to guideline
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Version / remarks:
1981
Deviations:
yes
Remarks:
Please refer to the field "Rationale for reliability incl. deficiencies" above
GLP compliance:
yes (incl. QA statement)
Remarks:
signed 1994-03-16
Type of method:
ring method
Key result
Surface tension:
53.2 mN/m
Temp.:
19.5 °C
Conc.:
0.068 g/L

RESULTS

The mean peak heights relating to the standard and sample solutions are detailed below:

Solution

Mean Peak height

Standard 510 mg/L

1.648 x 105

Standard 505 mg/L

1.604 x 105

Sample A

1.093 x 105

Sample B

1.071 x 105

 Mean sample solution concentration = 6.75 x 10-2 g/L

CALIBRATION

Reading

[mN/m]

Temperature [°C]

Literature Value [mN/m]

Calibration factor

72.3

19.5

72.82

1.007

72.2

19.5

72.82

1.009

72.2

19.5

72.82

1.009

72.1

19.5

72.82

1.010

72.3

19.5

72.82

1.007

72.3

19.5

72.82

1.007

Mean calibration factor = 1.008.

 

SAMPLE SOLUTION

Time [min]

Reading [mN/m]

Temperature [°C]

165

52.8

19.5

192

52.8

19.5

218

52.8

19.5

Mean reading = 52.8 mN/m.

Surface tension = reading x calibration factor = 52.8 x 1.008 = 53.2 mN/m.

Conclusions:
According to Council Directive 92/69/EEC A.5 and OECD Guideline 115 (1981), the surface tension of the aqueous solution at 19.5 °C ± 0.5 °C is σ = 53.2 mN/m. Since the surface tension is below 60 mN/m the test item has surface active properties.

Description of key information

The surface tension of the aqueous solution at 20 °C is σ = 53.2 mN/m. Since the surface tension is below 60 mN/m the test item has surface active properties in accordance to Regulation (EC) No 440/2008.

Key value for chemical safety assessment

Surface tension:
53.2
in mN/m at 20°C and concentration in mg/L:
67.5

Additional information