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Diss Factsheets

Physical & Chemical properties

Surface tension

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Administrative data

Link to relevant study record(s)

Reference
Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
19 December, 1989 to 3 January, 1990
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)
Deviations:
no
Qualifier:
according to guideline
Guideline:
other: ISO 304 ("Surface active agents - Determination of Surface Tension by Drawing up Liquid Films")
Deviations:
no
GLP compliance:
no
Type of method:
plate method
Specific details on test material used for the study:
SOURCE OF TEST MATERIAL
- Code number of the test material as used in the study: Methine Blue TRL; FAT No.: 31064/F
According to the analytical certificate the test compound consists to about 50 % of the cationic acetate. The other half is in the hydrolyzed OH-form (carbinol base).
Solvents: - Doubly quartz distilled water; - 0.1 M acetic acid
Temperature : of equilibrium bath: 20.0 ± 0.2 °C
Key result
Surface tension:
> 44.4 - <= 61.5 mN/m
Temp.:
20 °C
Conc.:
10 g/L
Remarks on result:
other: in double distilled water
Key result
Surface tension:
> 39.7 - <= 61.5 mN/m
Temp.:
20 °C
Conc.:
10 g/L
Remarks on result:
other: in 0.1 M acetic acid

Results

Surface tension by the Wilhelmy plate method: (ISO 304) for the test substance was 44.4 - 61.5 mN/m (double distilled water)

Surface tension by the Wilhelmy plate method: (ISO 304) for the test substance was 39.7 - 50.2 mN/m (double distilled water)

Temperature: 20 ± 0.2 °C

Conclusions:
Surface tension for the test substance in double distilled water was determined to be 44.4 - 61.5 mN/m, while it was determined to be 39.7 - 50.2 mN/m in 0.1 M acetic acid.
Executive summary:

A study was conducted to evaluate the surface tension of the test substance according to OECD Guideline 115 and ISO 304. The determination of the surface tension was accomplished by using the Wilhelmy plate method in double distilled water and 0.1 M acetic acid. Measurements in acetate at low pH were also carried out, since Methine blue is used for dyeing from an acidic solution. Based on the findings of the study, the surface tension of the test substance in double distilled water was determined to be 44.4 - 61.5 mN/m, while it was determined to be 39.7 - 50.2 mN/m in 0.1 M acetic acid.

Description of key information

A study was conducted to evaluate the surface tension of the test substance according to OECD Guideline 115 and ISO 304. The determination of the surface tension was accomplished by using the Wilhelmy plate method in double distilled water and 0.1 M acetic acid. Measurements in acetate at low pH were also carried out, since Methine blue is used for dying from an acidic solution. Based on the findings of the study, the surface tension of the test substance in double distilled water was determined to be 44.4 - 61.5 mN/m, while it was determined to be 39.7 - 50.2 mN/m in 0.1 M acetic acid.

Key value for chemical safety assessment

Surface tension:
44.4
in mN/m at 20°C and concentration in mg/L:
10 000

Additional information