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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:
4th October - 8th October 2010
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 the relevant results
Qualifier:
according to guideline
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
no
GLP compliance:
yes
Type of method:
OECD harmonised ring method
Surface tension:
52.299 mN/m
Temp.:
20 °C
Conc.:
45.5 mg/L
Remarks on result:
other: ± 1.16 nM/m

Table 1: Surface tension of the solvent

solvent

surface tension at temperature 20 °C, mN / m

1. parallel measurement

2. parallel measurement

3. parallel measurement

4. parallel measurement

average value

water – measurement value

72.105

71.296

71.614

71.861

71.719±0.3

water – published value

72.75

 

Table 2: Surface tenston of the shale oil solution

tested water solution

surface tension at temperature 20 °C, mN / m

1. parallel measurement

2. parallel measurement

3. parallel measurement

average value

Shale oils, heavy

53.414

50.699

52.784

52.299±1.16

 

Table 3: The amount of solved Shale oils, heavy in tested solution, determined by the evapouration method

tested water solution

solved Shale oils, heavy in water at temperature 20°C, g/l

1. parallel measurement

2. parallel measurement

3. parallel measurement

average value

Shale oils, heavy

0.0536

0.0382

0.0448

0.0455±0.0063

Conclusions:
The surface tension of aqueous solution of Shale oils, heavy with concentration 0.046 g/l (determined by method evaporation residue) is 52.299 ± 1.16 mN / m. Surface tension of Shale oil, heavy is lower than 60 mN / m under the conditions of this method, so it should be regarded as being surface-active material.
Executive summary:

The surface tension of shale oils, heavy fraction was determined according to the OECD ring method. The OECD 115 guideline and EU method A.5. The study was performed according to the principles of GLP, although the laboratory is not yet certificated.

The surface tension of aqueous solution of Shale oils, heavy with concentration 0.046 g/l (determined by method evaporation residue) is 52.299 ± 1.16 mN / m. Surface tension of Shale oil, heavy is lower than 60 mN / m under the conditions of this method, so it should be regarded as being surface-active material.

Description of key information

The surface tension of aqueous solution of Shale oils, heavy with concentration
0.046 g/l (determined by method evaporation residue) is 52.299 ± 1.16 mN / m.
Surface tension of Shale oil, heavy is lower than 60 mN / m under the conditions
of this method, so it should be regarded as being surface-active material.

Key value for chemical safety assessment

Surface tension:
52.299
in mN/m at 20°C and concentration in mg/L:
46

Additional information