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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:
27 May 2010-09 July 2010
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
This study has been performed according to OECD and EC guidelines and according to GLP principles. The test substance is adequately characterised. Therefore full validation applies.
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 (incl. QA statement)
Type of method:
OECD harmonised ring method
Key result
Surface tension:
74.5 mN/m
Temp.:
20 °C
Conc.:
1 g/L

The water calibration factor was calculated to be 1.03.

The mean of five consistent measurement was 72.3 mN/m (before correction).

Conclusions:
In the experimental conditions, the test substance is NOT considered to be surface active.
Executive summary:

The surface tension of a solution of Aluminium chloride hydroxide sulphate (content ca 16%, as typically manufactured) was measured according to OECD 115/EU A5 guidelines, ring method. Five measurements, at the maximum testing concentration of 1 g solution/L in double-distilled water and 20°C, were recorded, and the mean value was corrected with calibration factor from water and for Harkins-Jordan ring dimension factor.

The final retained result is 74.5 mN/m.

Description of key information

Aluminium chloride hydroxide sulphate (aqueous solution as manufactured) is NOT considered to be surface-active.

Key value for chemical safety assessment

Surface tension:
74.5
in mN/m at 20°C and concentration in mg/L:
1 000

Additional information

A fully reliable experimental study, conducted according to a recognized OECD/EC method and under GLP, is available. Therefore, it is considered as a key study, and the result is retained as key data. It should be noted that the test concentration refers to the substance as manufactured, i.e. 1 g/L of solution, not of salt.

Furthermore, inorganic substances are generally known to have no impact or slightly increase the surface tension of water.

As an UVCB, it should be noted that the value of the parameter may show some variations.

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