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Physical & Chemical properties

Surface tension

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Reference
Endpoint:
surface tension
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2000-04-19 to 2000-10-31
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Remarks:
This experimental study was conducted according to the internationaly recommended guidelines into force, and under GLP. Purity is specified, and isomers composition is available from the notifier. However, some informations are missing. Therefore validation applies with restrictions.
Qualifier:
according to
Guideline:
OECD Guideline 115 (Surface Tension of Aqueous Solutions)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.5 (Surface Tension)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Remarks:
France, GIPC (inspection on February 23, 2000, signed on June 07, 2000)
Type of method:
ring method
Specific details on test material used for the study:
Storage condition of test material: amber glass flask in darkness at room temperature under nitrogen.
Key result
Surface tension:
50.6 mN/m
Temp.:
20 °C
Conc.:
9.81 mg/L
Remarks on result:
other: +/- 1.8 mN/m

RESULTS

Distilled water

(sigma)0 = 72.75 mN/m (surface tension of water at 20°C; value given in the literature)

(sigma)g = 76.5 (assay 1) and 75.8 mN/m (assay 3) (surface tension of Aguettant water at 20.1°C)

Calibration factor: (phy)b = 0.950 (assay 1) and 0.958 (assay 3).

Test item solution

Concentration 9.81 mg/L

Temperature of test item in assay 1: 20°C

Temperature of test item in assay 3: 20°C

Assay Measurement (mN/m) Correction using (phy)b (mN/m) Correction according to Harkins & Jordan table (mN/m)
State of equilibrium
1 55.2 52.44 51.2
3 53.5 51.25 49.9

The value of assay 2 was not valid.

Conclusions:
According to EU A5 criteria, as the result is below the threshold value of 60 mN/m, the substance is considered to have surface-active potential under the experimental conditions.
Executive summary:

The surface tension of the test substance was measured under GLP according to EU A5/OECD 115 guidelines, ring method.

The test was conducted on a solution at 90% of the saturation solubility, corresponding to about 9.8 mg/L. Three replicates were performed at 20°C; one value was not valid. The mean of the two other assays was corrected with calibration factor from water, and Hawkins & Jordan table.

The surface tension of the test substance was determined to be 50.6 mN/m, at 9.8 mg/L and 20°C.

Description of key information

According to EU A5 criteria, as the result is below the threshold value of 60 mN/m, the substance is considered to have surface-active potential under the experimental conditions. However, since the structure is not characteristic of a true surfactant, and it is not the intended use of the substance (i.e. not a desired property), this conclusion should be taken with caution.

Key value for chemical safety assessment

Surface tension:
50.6
in mN/m at 20°C and concentration in mg/L:
9.8

Additional information

A reliable experimental study, conducted according to a recognized EC method and under GLP, is available. Despite restrictions due to missing information in the report, it is considered as a key study, and the result is retained as key value for purpose of CSA.